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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » [solved] drawing to a GC through SWT and native code
[solved] drawing to a GC through SWT and native code [message #638284] Wed, 10 November 2010 17:09 Go to next message
Christian Sell is currently offline Christian SellFriend
Messages: 51
Registered: August 2010
Member
Hello,

I am creating an integrated printing solution which uses SWT to output parts of a document, and a C DLL (under Windows) to output other parts. Reason for this is that the DLL contains a word processing component which is able to render RTF.

To achieve this, I am passing the handle from the GC object over to the C DLL side. This goes well, if output is only generated from there. However, as soon as I call GC#drawString prior to calling the DLL, the output generated from there has wrong distances between lines, resulting in partially messed-up layout. This does not happen if I call other GC methods, such as drawLine.

It seems to me that the GC#drawString method is configuring the GC in a way unexpected by the DLL component. Can anybody hint on what is going on here?

thanks,
Christian Sell

[Updated on: Mon, 22 November 2010 20:05]

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Re: [solved] drawing to a GC through SWT and native code [message #640693 is a reply to message #638284] Mon, 22 November 2010 20:22 Go to previous message
Christian Sell is currently offline Christian SellFriend
Messages: 51
Registered: August 2010
Member
ok, I've got it. I ran through all the attributes of the device context and compared the values when printing through SWT first and when printing through the external component only.

I found that after using GC#drawString() the value retreived through GetTextalign(HDC) was always 24, whereas otherwise, it was 0. Now I simply call SetTextAlign(hdc, 0) in the external DLL before invoking the print routines proper, and voila, all is well

greetings,
Christian

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