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updated the .Net wrapper api

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Natalia
2022-09-01 13:04:38 +03:00
parent d596a09c3f
commit 8c1853c65d
1 changed files with 148 additions and 96 deletions
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DesktopEditor/doctrenderer/docbuilder.net/src/docbuilder.net.h
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@ -46,8 +46,8 @@ namespace docbuilder_net
ref class CDocBuilderContext;
/// <summary>
/// Class for getting results of called js commands.
/// Represent the wrapper over js object.
/// Class for getting the results of called JS commands.
/// It represents a wrapper for a JS object.
/// </summary>
public ref class CDocBuilderValue
{
@ -72,74 +72,86 @@ namespace docbuilder_net
/// <returns> True if this object is undefined. </returns>
bool IsUndefined();
/// <returns> True if this object is integer. </returns>
/// <returns> True if this object is an integer. </returns>
bool IsInt();
/// <returns> True if this object is double. </returns>
/// <returns> True if this object is a double value. </returns>
bool IsDouble();
/// <returns> True if this object is string. </returns>
/// <returns> True if this object is a string. </returns>
bool IsString();
/// <returns> True if this object is function. </returns>
/// <returns> True if this object is a function. </returns>
bool IsFunction();
/// <returns> True if this object is object. </returns>
/// <returns> True if this object is an object. </returns>
bool IsObject();
/// <returns> True if this object is array. </returns>
/// <returns> True if this object is an array. </returns>
bool IsArray();
/// <returns> True if this object is typed array. </returns>
/// <returns> True if this object is a typed array. </returns>
bool IsTypedArray();
/// <returns> length if this object is array/typed array. Otherwise, returns 0 </returns>
/// <returns> The length if this object is an array/typed array. Otherwise, returns 0. </returns>
unsigned int GetLength();
/// <summary> Convert this object to a boolean value. </summary>
/// <summary> Converts this object to a boolean value. </summary>
bool ToBool();
/// <summary> Convert this object to an integer. </summary>
/// <summary> Converts this object to an integer. </summary>
int ToInt();
/// <summary> Convert this object to double value. </summary>
/// <summary> Converts this object to a double value. </summary>
double ToDouble();
/// <summary> Convert this object to a string. </summary>
/// <summary> Converts this object to a string. </summary>
String^ ToString() override;
/// <summary> Returns a property of this object. </summary>
/// <param name="name"> The name of the CDocBuilderValue object property. </param>
CDocBuilderValue^ GetProperty(String^ name);
/// <summary> Analogue of the GetProperty method. </summary>
/// <param name="name"> The name of the CDocBuilderValue object property. </param>
CDocBuilderValue^ Get(String^ name);
/// <summary> Returns an array value by its index. </summary>
/// <param name="index"> The index of the array value. </param>
CDocBuilderValue^ Get(int index);
/// <summary> Sets a property to this object. </summary>
/// <param name="name"> The name of the CDocBuilderValue object property. </param>
/// <param name="value"> The value of the CDocBuilderValue object property. </param>
void SetProperty(String^ name, CDocBuilderValue^ value);
/// <summary> Analogue of the SetProperty. </summary>
/// <summary> Analogue of the SetProperty method. </summary>
/// <param name="name"> The name of the CDocBuilderValue object property. </param>
/// <param name="value"> The value of the CDocBuilderValue object property. </param>
void Set(String^ name, CDocBuilderValue^ value);
/// <summary> Sets an array value by its index. </summary>
/// <param name="index"> The index of the array value. </param>
/// <param name="value"> The array value to be set. </param>
void Set(int index, CDocBuilderValue^ value);
/// <summary> Get/Set the value by index. </summary>
/// <summary> Returns/Sets an array value by its index. </summary>
/// <param name="index"> The index of the array value. </param>
/// <param name="value"> The array value to be set. </param>
property CDocBuilderValue^ default[int]
{
CDocBuilderValue ^ get(int index) { return Get(index); }
void set(int index, CDocBuilderValue ^ value) { Set(index, value); }
}
/// <summary> Indexer analogue of the GetProperty/SetProperty. </summary>
/// <summary> The indexer analogue of the GetProperty/SetProperty methods. </summary>
/// <param name="name"> The name of the CDocBuilderValue object property. </param>
/// <param name="value"> The value of the CDocBuilderValue object property. </param>
property CDocBuilderValue^ default[String^]
{
CDocBuilderValue ^ get(String^ name) { return Get(name); }
@ -147,6 +159,7 @@ namespace docbuilder_net
}
public:
/// <summary> Creates an object from primitive types. </summary>
CDocBuilderValue(bool value);
CDocBuilderValue(int value);
CDocBuilderValue(unsigned int value);
@ -161,36 +174,64 @@ namespace docbuilder_net
/// <summary>
/// Please use CDocBuilderContext.CreateUndefined.
/// This method gets the current context and call method of it.
/// Creates an undefined value. This method returns the current context and calls its CreateUndefined method.
/// </summary>
static CDocBuilderValue^ CreateUndefined();
/// <summary>
/// Please use CDocBuilderContext.CreateNull.
/// This method gets the current context and call method of it.
/// Creates a null value. This method returns the current context and calls its CreateNull method.
/// </summary>
static CDocBuilderValue^ CreateNull();
public:
/// <summary> The object methods for calling functions. </summary>
/// <summary> Calls the specified Document Builder method. </summary>
/// <param name="name"> The name of the Document Builder method. </param>
CDocBuilderValue^ Call(String^ name);
/// <summary> The object methods for calling functions. </summary>
/// <summary> Calls the specified Document Builder method. </summary>
/// <param name="name"> The name of the Document Builder method. </param>
/// <param name="p1"> The first parameter that the Document Builder method takes as an arguments. </param>
CDocBuilderValue^ Call(String^ name, CDocBuilderValue^ p1);
/// <summary> The object methods for calling functions. </summary>
/// <summary> Calls the specified Document Builder method. </summary>
/// <param name="name"> The name of the Document Builder method. </param>
/// <param name="p1"> The first parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p2"> The second parameter that the Document Builder method takes as an arguments. </param>
CDocBuilderValue^ Call(String^ name, CDocBuilderValue^ p1, CDocBuilderValue^ p2);
/// <summary> The object methods for calling functions. </summary>
/// <summary> Calls the specified Document Builder method. </summary>
/// <param name="name"> The name of the Document Builder method. </param>
/// <param name="p1"> The first parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p2"> The second parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p3"> The third parameter that the Document Builder method takes as an arguments. </param>
CDocBuilderValue^ Call(String^ name, CDocBuilderValue^ p1, CDocBuilderValue^ p2, CDocBuilderValue^ p3);
/// <summary> The object methods for calling functions. </summary>
/// <summary> Calls the specified Document Builder method. </summary>
/// <param name="name"> The name of the Document Builder method. </param>
/// <param name="p1"> The first parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p2"> The second parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p3"> The third parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p4"> The fourth parameter that the Document Builder method takes as an arguments. </param>
CDocBuilderValue^ Call(String^ name, CDocBuilderValue^ p1, CDocBuilderValue^ p2, CDocBuilderValue^ p3, CDocBuilderValue^ p4);
/// <summary> The object methods for calling functions. </summary>
/// <summary> Calls the specified Document Builder method. </summary>
/// <param name="name"> The name of the Document Builder method. </param>
/// <param name="p1"> The first parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p2"> The second parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p3"> The third parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p4"> The fourth parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p5"> The fifth parameter that the Document Builder method takes as an arguments. </param>
CDocBuilderValue^ Call(String^ name, CDocBuilderValue^ p1, CDocBuilderValue^ p2, CDocBuilderValue^ p3, CDocBuilderValue^ p4, CDocBuilderValue^ p5);
/// <summary> The object methods for calling functions. </summary>
/// <summary> Calls the specified Document Builder method. </summary>
/// <param name="name"> The name of the Document Builder method. </param>
/// <param name="p1"> The first parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p2"> The second parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p3"> The third parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p4"> The fourth parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p5"> The fifth parameter that the Document Builder method takes as an arguments. </param>
/// <param name="p6"> The sixth parameter that the Document Builder method takes as an arguments. </param>
CDocBuilderValue^ Call(String^ name, CDocBuilderValue^ p1, CDocBuilderValue^ p2, CDocBuilderValue^ p3, CDocBuilderValue^ p4, CDocBuilderValue^ p5, CDocBuilderValue^ p6);
internal:
@ -212,8 +253,9 @@ namespace docbuilder_net
/// </summary>
/// <param name="path"> The path to the file to be opened together with its name and extension. </param>
/// <param name="params">
/// The parameters needed for the correct file opening (most commonly the encoding is used for the txt and csv file types or the delimiter for the csv files,
/// for other file types this is just an empty string).The parameters are added in the form of XML tags, where m_nCsvTxtEncoding is used for the text encoding
/// The parameters needed for the correct file opening (most commonly, the encoding is used for the txt and csv file types or the delimiter for the csv files,
/// for other file types this is just an empty string). The parameters are added in the form of XML tags, where m_nCsvTxtEncoding is used for the text encoding
/// and m_nCsvDelimiter is used for the csv delimiter. The supported values for the csv delimiters include: 0 - no delimiter; 1 - tab; 2 - semicolon; 3 - colon; 4 - comma; 5 - space.
/// </param>
/// <returns> Process x2t return code. </returns>
int OpenFile(String^ path, String^ params);
@ -222,8 +264,8 @@ namespace docbuilder_net
/// Creates a new file. The type of the file which will be created needs to be set.
/// </summary>
/// <param name="type">
/// The type of the file to be created is specified as a hexadecimal
/// integer for the code or docx, xlsx or pptx for the .docbuilder script file (see AVS_OFFICESTUDIO_FILE_XXX values).
/// The type of the file to be created set as a hexadecimal
/// integer for the .Net code or docx, xlsx or pptx for the .docbuilder script file (see AVS_OFFICESTUDIO_FILE_XXX values).
/// </param>
/// <returns> True if the operation is successful. </returns>
bool CreateFile(int type);
@ -240,8 +282,8 @@ namespace docbuilder_net
/// Saves the file after all the changes are made. The type of the file which will be saved needs to be set.
/// </summary>
/// <param name="type">
/// The type of the file to be saved is specified as a hexadecimal integer for the C++ code; for the .docbuilder script file the following values are possible:
/// docx, odt, rtf, txt, pptx, xlsx, ods, csv, pdf(see AVS_OFFICESTUDIO_FILE_XXX values).
/// The type of the file to be saved set as a hexadecimal integer for the .Net code; for the .docbuilder script file the following values are possible:
/// docx, odt, rtf, txt, pptx, xlsx, ods, csv, pdf (see AVS_OFFICESTUDIO_FILE_XXX values).
/// </param>
/// <param name="path"> The path to the file to be saved together with its name and extension. </param>
/// <returns> Process x2t return code. </returns>
@ -251,22 +293,29 @@ namespace docbuilder_net
/// Saves the file after all the changes are made. The type of the file which will be saved needs to be set.
/// </summary>
/// <param name="type">
/// The type of the file to be saved is specified as a hexadecimal integer for the C++ code; for the .docbuilder script file the following values are possible:
/// docx, odt, rtf, txt, pptx, xlsx, ods, csv, pdf(see AVS_OFFICESTUDIO_FILE_XXX values).
/// The type of the file to be saved set as a hexadecimal integer for the .Net code; for the .docbuilder script file the following values are possible:
/// docx, odt, rtf, txt, pptx, xlsx, ods, csv, pdf (see AVS_OFFICESTUDIO_FILE_XXX values).
/// </param>
/// <param name="path"> The path to the file to be saved together with its name and extension. </param>
/// <param name="params">
/// The parameters needed for the correct file opening (most commonly the encoding is used for the txt and csv file types or the delimiter for the csv files,
/// for other file types this is just an empty string).The parameters are added in the form of XML tags, where m_nCsvTxtEncoding is used for the text encoding
/// and m_nCsvDelimiter is used for the csv delimiter.The supported values for the csv delimiters include : 0 - no delimiter; 1 - tab; 2 - semicolon; 3 - colon; 4 - comma; 5 - space.
/// When saving into an image file(png or jpg) for creating thumbnails, the additional parameters are used.
/// The parameters needed for the correct file opening (most commonly, the encoding is used for the txt and csv file types or the delimiter for the csv files,
/// for other file types this is just an empty string). The parameters are added in the form of XML tags, where m_nCsvTxtEncoding is used for the text encoding
/// and m_nCsvDelimiter is used for the csv delimiter. The supported values for the csv delimiters include : 0 - no delimiter; 1 - tab; 2 - semicolon; 3 - colon; 4 - comma; 5 - space.
/// When saving into an image file (png or jpg) for creating thumbnails, the additional parameters in the form of XML tags are used:
/// m_oThumbnail - the core tag showing that the inner nodes will be used to create a thumbnail out of the document file;
/// format - the image file format used to create a thumbnail (can be of the following values: 3 - for a JPG file, 4 - for a PNG file);
/// aspect - the image aspect when creating a thumbnail from the document file (can be of the following values: 1 - will keep the original aspect, 0 - will stretch the image to fit the width and the height set below;
/// first - whether only the first page or all the pages should be converted into a thumbnail (can be of the following values: true - only the first page will be converted, false - all the document pages will be used to create thumbnails, in this case the file will be saved as an archive of images, one for each page);
/// width - the image width in pixels;
/// height - the image height in pixels.
/// For example: oBuilder.SaveFile(OFFICESTUDIO_FILE_IMAGE, L"thumbnail.png", "<m_oThumbnail><format>4</format><aspect>1</aspect><first>false</first><width>1000</width><height>1000</height></m_oThumbnail>");
/// </param>
/// <returns> Process x2t return code. </returns>
bool SaveFile(int type, String^ path, String^ params);
/// <summary>
/// Close the file to stop working with it. You can use a single ONLYOFFICE Document Builder instance
/// Closes the file to stop working with it. You can use a single ONLYOFFICE Document Builder instance
/// to work with all your files, but you need to close the previous file before you can
/// start working with the next one in this case.
///
@ -289,21 +338,21 @@ namespace docbuilder_net
void CloseFile();
/// <summary>
/// Execute the command which will be used to create the document file (text document, spreadsheet, PDF, etc.).
/// Executes the command which will be used to create the document file (text document, spreadsheet, presentation, form document, PDF).
/// </summary>
/// <param name="command">
/// The command in the form of JavaScript code which will be used to create the document file (in C++,
/// the escape character must be used when the command contains quotation symbols).
/// The command in the form of JavaScript code which will be used to create the document file
/// (in .Net, the escape character must be used when the command contains quotation symbols).
/// </param>
/// <returns> True if the operation is successful. </returns>
bool ExecuteCommand(String^ command);
/// <summary>
/// Execute the command which will be used to create the document file (text document, spreadsheet, PDF, etc.).
/// Executes the command which will be used to create the document file (text document, spreadsheet, presentation, form document, PDF).
/// </summary>
/// <param name="command">
/// The command in the form of JavaScript code which will be used to create the document file (in C++,
/// the escape character must be used when the command contains quotation symbols).
/// The command in the form of JavaScript code which will be used to create the document file
/// (in .Net, the escape character must be used when the command contains quotation symbols).
/// </param>
/// <param name="retValue"> The command return value. </param>
/// <returns> True if the operation is successful. </returns>
@ -311,10 +360,10 @@ namespace docbuilder_net
/// <summary>
/// Runs ONLYOFFICE Document Builder executable.If you do not want to write a C++ application,
/// you can simply use the docbuilder.exe executable fileand run it with the.docbuilder file as an argument,
/// where all the code for the document file creation will be written.For C++, use the path to the
/// executable file from the sPath parameter, create the CDocBuilder objectand call the Run method.
/// Runs the ONLYOFFICE Document Builder executable. If you do not want to write a .Net application,
/// you can simply use the docbuilder.exe executable file and run it with the.docbuilder file as an argument,
/// where all the code for the document file creation will be written. For .Net, create the CDocBuilder object
/// and call the Run method with the path to the executable file from the sPath parameter.
/// </summary>
/// <param name="path"> The path to the ONLYOFFICE Document Builder executable. </param>
/// <returns> True if the operation is successful. </returns>
@ -322,60 +371,63 @@ namespace docbuilder_net
/// <summary>
/// Runs all the commands for the document creation using a single command.
/// Compared to ExecuteCommand where only one command at a time is allowed, RunText
/// Compared to CDocBuilder.ExecuteCommand where only one command at a time is allowed, CDocBuilder.RunText
/// makes it possible to enter all the commands for the document creation at once.
/// </summary>
/// <param name="commands">
/// The commands in Unicode format which will be used to create the document file.
/// All the commands containing builder.are line separated, i.e.you cannot write them in one line, each command must start with its own line.
/// The commands which will be used to create the document file.
/// All the commands containing builder. are line separated, i.e. you cannot write them in one line, each command must start with its own line.
/// </param>
/// <returns> True if the operation is successful. </returns>
bool RunText(String^ commands);
/// <summary>
/// Sets an argument to the builder class which can be trasferred to the program outside the CDocBuilder.ExecuteCommand method,
/// i.e.either as an additional property when running ONLYOFFICE Document Builder executable file or as a part of program code, but not included into the document file script.
/// i.e. either as an additional property when running ONLYOFFICE Document Builder executable file or as a part of program code, but not included into the document file script.
/// </summary>
/// <remarks>
/// Supported properties :
/// Supported properties:
/// <para>
/// --use - doctrenderer - scheme - Specifies if the doctrenderer mode is used when building a document or getting content from the editor when saving a file(true / false).
/// Default : false
/// --use-doctrenderer-scheme - Specifies if the doctrenderer mode is used when building a document or getting content from the editor when saving a file (true / false).
/// Default: false
/// </para>
/// <para>
/// --check - fonts - Specifies if the system fonts are cached for faster work(true / false).
/// Default : true
/// --check-fonts - Specifies if the system fonts are cached for faster work (true / false).
/// Default: true
/// </para>
/// <para>
/// --work - directory - The path to the temporary directory.
/// Default : ""
/// --work-directory - The path to the temporary directory.
/// Default: ""
/// </para>
/// <para>
/// --cache - scripts - Specifies if the sdkjs scripts are cached(true / false).
/// Default : true
/// --cache-scripts - Specifies if the sdkjs scripts are cached (true / false).
/// Default: true
/// </para>
/// <para>
/// --save - use - only - names - Specifies if the destination paths are used(for server work) (true / false).
/// --save-use-only-names - Specifies if the destination paths are used (for server work) (true / false).
/// <example>
/// For example : / home / user / 1.txt = > / tmp / 1.txt
/// For example: /home/user/1.txt = > /tmp/1.txt
/// </example>
/// Default: false
/// </para>
/// <para>
/// --all - fonts - path - The path to the AllFonts.js script.
/// --argument - The JSON argument which is sent to the global parameters of all the opened js context.
/// --fonts - system - Specifies if the system fonts are used(true / false).
/// Default : true
/// --all-fonts-path - The path to the AllFonts.js script.
/// --argument - The JSON argument which is sent to the global parameters of all the opened JS context.
/// --fonts-system - Specifies if the system fonts are used (true / false).
/// Default: true
/// </para>
/// --fonts - dir - The path to the additional fonts directory(may be many records).
/// --fonts-dir - The path to the additional fonts directory (may be many records).
/// </remarks>
/// <param name="param"> The parameter name in UTF8 format, the value is always --argument. </param>
/// <param name="value"> The parameter value in UTF8 format, which will be used in the document. </param>
/// <param name="param"> The parameter name, the value is always --argument. </param>
/// <param name="value"> The parameter value which will be used in the document. </param>
void SetProperty(String^ param, String^ value);
/// <summary>
/// Writes data to the file. Used for logs in js code.
/// Writes data to the log file. It is used for logs in JS code.
/// <param name="path"> The path to the file where all the logs will be written. </param>
/// <param name="value"> The data which will be written to the log file. </param>
/// <param name="append"> Specifies if the new data will be appended to the already existing log file or a new file will be created. </param>
/// </summary>
void WriteData(String^ path, String^ value, bool append);
@ -386,33 +438,32 @@ namespace docbuilder_net
/// <returns> True if the doctrenderer mode is used on saving. See the --use-doctrenderer-scheme property. </returns>
bool IsSaveWithDoctrendererMode();
/// <returns> The document builder engine version. </returns>
/// <returns> The ONLYOFFICE Document Builder engine version. </returns>
String^ GetVersion();
/// <summary>
/// Returns the current js context.
/// </summary>
/// <returns> The current JS context. </returns>
CDocBuilderContext^ GetContext();
public:
/// <summary>
/// Initializes the ONLYOFFICE Document Builder as a library for the application to be able to work with it.
/// This method just sets the directory to the main builder resources(icu files and etc).If this method is not called,
/// the builder will find resources from the current process directory.
/// This method just sets the directory to the main Document Builder resources (icu files, etc). If this method is not called,
/// the Document Builder will find resources from the current process directory.
/// </summary>
/// <param name="directory"> The path to the main Document Builder resources. </param>
static void Initialize(String^ directory);
/// <summary>
/// Initializes the ONLYOFFICE Document Builder as a library for the application to be able to work with it.
/// This method just sets the directory to the main builder resources(icu files and etc).If this method is not called,
/// the builder will find resources from the current process directory.
/// This method just sets the directory to the main Document Builder resources (icu files, etc). If this method is not called,
/// the Document Builder will find resources from the current process directory.
/// </summary>
static void Initialize();
/// <summary>
/// Unloads the ONLYOFFICE Document Builder from the application memory when it is no longer needed.
/// Generally, there is no need to dispose js before exiting
/// the process, it should happen automatically.It should only be used if the process needs the resources taken up by js.
/// Generally, there is no need to dispose JS before exiting
/// the process, it should happen automatically. It should only be used if the process needs the resources taken up by JS.
/// </summary>
static void Destroy();
@ -421,7 +472,7 @@ namespace docbuilder_net
};
/// <summary>
/// Stack-allocated class which sets the execution context for all operations executed within a local scope.
/// The stack-allocated class which sets the execution context for all operations executed within a local scope.
/// All opened scopes will be closed automatically when the builder CloseFile method is called.
/// </summary>
public ref class CDocBuilderContextScope
@ -446,7 +497,7 @@ namespace docbuilder_net
};
/// <summary>
/// Class for getting js context for working.
/// Class for getting JS context for working.
/// </summary>
public ref class CDocBuilderContext
{
@ -460,43 +511,44 @@ namespace docbuilder_net
public:
/// <summary>
/// Creates an undefined value, an analogue of undefined in js.
/// Creates an undefined value, an analogue of undefined in JS.
/// </summary>
CDocBuilderValue^ CreateUndefined();
/// <summary>
/// Creates a null value, an analogue of null in js.
/// Creates a null value, an analogue of null in JS.
/// </summary>
CDocBuilderValue^ CreateNull();
/// <summary>
/// Creates an empty object, an analogue of {} in js.
/// Creates an empty object, an analogue of {} in JS.
/// </summary>
CDocBuilderValue^ CreateObject();
/// <summary>
/// Creates an array value, an analogue of new Array(length) in js.
/// Creates an array value, an analogue of new Array (length) in JS.
/// </summary>
/// <param name="length"> The array length. </param>
CDocBuilderValue^ CreateArray(int length);
/// <summary>
/// Creates a Uint8Array value, an analogue of Uint8Array in js.
/// Creates a Uint8Array value, an analogue of Uint8Array in JS.
/// </summary>
/// <param name="buffer"> The array buffer. </param>
CDocBuilderValue^ CreateTypedArray(array<Byte>^ buffer);
/// <summary>
/// Returns the global object for the context.
/// </summary>
/// <returns>
/// The global object for the current context.
/// </returns>
CDocBuilderValue^ GetGlobal();
/// <summary>
/// Creates a context scope.
/// Creates a context scope which sets the execution context for all operations executed within a local scope.
/// </summary>
/// <returns></returns>
CDocBuilderContextScope^ CreateScope();
/// <summary>
/// Checks for errors in js.
/// Checks for errors in JS.
/// The error message and call stack will be written to std::cerr.
/// </summary>
bool IsError();