LEADTOOLS Image File Support (Leadtools.Codecs assembly)

LoadMetafile Method

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Example 







The source RTF file.
The 1-based page number to load.
Loads the specified RTF file as a Windows Enhanced Metafile.
Syntax
public IntPtr LoadMetafile( 
   string fileName,
   int pageNumber
)
'Declaration
 
Public Function LoadMetafile( _
   ByVal fileName As String, _
   ByVal pageNumber As Integer _
) As IntPtr
'Usage
 
Dim instance As CodecsRtfOptions
Dim fileName As String
Dim pageNumber As Integer
Dim value As IntPtr
 
value = instance.LoadMetafile(fileName, pageNumber)
public IntPtr LoadMetafile( 
   string fileName,
   int pageNumber
)

            

            
 function Leadtools.Codecs.CodecsRtfOptions.LoadMetafile( 
   fileName ,
   pageNumber 
)
public:
IntPtr LoadMetafile( 
   String^ fileName,
   int pageNumber
) 

Parameters

fileName
The source RTF file.
pageNumber
The 1-based page number to load.

Return Value

The Windows Enhanced Metafile this method creates.
Remarks

This method uses the following members of the current CodecsRasterizeDocumentLoadOptions set in RasterCodecs.Options.RasterizeDocument.Load to determine the page size, resolution and margins:

Also, it uses the following members of the current CodecsRtfLoadOptions set in RasterCodecs.Options.Rtf.Load to determine the back color to use:

So you must set these options according to your application needs before calling this method. The number of pages inside the RTF file will depend on the Rasterize Document options.

You must destroy the Windows Enhanced Metafile (EMF) handle this method creates manually using the DeleteEnhMetaFile Windows API.

Example
Copy Code  
Imports Leadtools
Imports Leadtools.Codecs

<DllImport("Gdi32")> _
Private Shared Function DeleteEnhMetaFile(ByVal hemf As IntPtr) As Integer
End Function
Public Sub LoadRtfAsMetafileExample()
   Dim codecs As New RasterCodecs()

   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.rtf")

   ' Load the source file as a metafile
   Dim hemf As IntPtr = codecs.Options.Rtf.LoadMetafile(srcFileName, 1)

   If hemf <> IntPtr.Zero Then
      ' Use the metafile here

      ' Finally, delete it using the Windows API
      DeleteEnhMetaFile(hemf)
   End If

   ' Clean up
   codecs.Dispose()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;

[DllImport("Gdi32")]
private static extern int DeleteEnhMetaFile(IntPtr hemf);
public void LoadRtfAsMetafileExample()
{
    RasterCodecs codecs = new RasterCodecs();

    string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.rtf");

    // Load the source file as a metafile
    IntPtr hemf = codecs.Options.Rtf.LoadMetafile(srcFileName, 1);

    if (hemf != IntPtr.Zero)
    {
        // Use the metafile here

        // Finally, delete it using the Windows API
        DeleteEnhMetaFile(hemf);
    }

    // Clean up
    codecs.Dispose();
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
Requirements

Target Platforms

See Also

Reference

CodecsRtfOptions Class
CodecsRtfOptions Members

 

 


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