Rave Reports Developer Reference

TBaseReport. OnDecodeImage event (read/write/published)

Declaration

procedure OnDecodeImage( Sender: TObject); ImageStream: TStream; ImageType: String; Bitmap: TBitmap );

Category

Graphics   HTML   PDF   RTF

Description

This event is called when Rave needs to convert image data (created from the PrinitImageRect method) to a bitmap for printing. This would normally appear on a TRvRenderPrinter or TRvRenderPreview component, but could also be defined in a TRvSystem component.

See also

TBaseReport Class, PrintImageRect

Example (Delphi)

var

Image: TJPEGImage;

Format: word;

Data: THandle;

Palette: HPalette;

if ImageType = 'JPG' then begin

Image := TJPEGImage.Create;        // Create a TJPEGImage class

Image.LoadFromStream(ImageStream); // Load JPEG image from ImageStream

Image.DIBNeeded;                   // Convert JPEG to bitmap format

// Save JPEG to clipboard in bitmap format

Image.SaveToClipboardFormat(Format,Data,Palette);

Image.Free;                        // Free the image

// Load bitmap from clipboard

Bitmap.LoadFromClipboardFormat(Format,Data,Palette);

end; { if}

Example (C++Builder)

if (ImageType == "JPG") {

Image = new TJPEGImage();             // Create a JPEGImage class

Image->LoadFromStream(ImageStream);  // Load JPEG image from ImageStream

Image->DIBNeeded();                  // Convert JPEG to bitmap format

// Save JPEG to clipboard in bitmap format

Image->SaveToClipboardFormat(Format,Data,Palette);

delete Image;                        // Free the image

// Load bitmap from clipboard

Bitmap->LoadFromClipboardFormat(Format,Data,Palette);

} // if