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Picture to JPEG on Windows

Subject: Picture to JPEG on Windows
From: Ian <email@hidden>
Date: Mon, 20 Dec 2004 13:26:26 +0000
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi all.

I'm using the following (abbreviated) code to convert a Picture in memory to compressed JPEG format:

UInt32 convertToJPEG(PicHandle source,Handle dest, CodecQ quality)
{
  OSErr osErr;
  ComponentResult cResult;
  GraphicsExportComponent graphicsExporter;
  UInt32 jpegBytesLength=0;

osErr=OpenADefaultComponent(GraphicsExporterComponentType,'JPEG',&graphi csExporter); cResult=GraphicsExportSetInputPicture(graphicsExporter,source); cResult=GraphicsExportSetOutputHandle(graphicsExporter,dest); cResult=GraphicsExportSetCompressionQuality(graphicsExporter,quality); cResult=GraphicsExportDoExport(graphicsExporter,&jpegBytesLength); return jpegBytesLength; }

source is a valid Picture, and dest is a freshly allocated handle created via dest=NewHandle(0) - the export operation resizes accordingly.

This works great on Mac, but on Windows GraphicsExportDoExport returns -50 (bad parameter error). Any ideas what the problem could be?

TIA
Ian

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