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08.14.2002 at 10:44AM PDT, ID: 20336418
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7.8

why is WindowFromDC returning NULL?

Asked by jbirk in Windows Programming

Tags: ,

I'm hooking the textout messages being sent, and when the text message for a disabled button is sent, calling WindowFromDC on the hdc sent in the message returns null.  This only seems to happen to me on the disabled buttons text, not all the other text.  If I use GetLastError to check what happened, it reports: "The operation completed successfully.".  What's going on? (this is on W2K system)

Example code:
BOOL  WINAPI TextOutWCallbackProc(HDC hdc, int nXStart, int nYStart, LPCWSTR lpwString, int cbCount)
{
HWND hwnd1;
hwnd1 = WindowFromDC(hdc);


Thanks,
Josh
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[+][-]08.14.2002 at 11:13AM PDT, ID: 7220579

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[+][-]08.14.2002 at 01:41PM PDT, ID: 7220927

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[+][-]08.14.2002 at 03:00PM PDT, ID: 7221083

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[+][-]08.16.2002 at 01:59AM PDT, ID: 7224432

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About this solution

Zone: Windows Programming
Tags: windowfromdc, null
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Solution Provided By: roshmon
Participating Experts: 2
Solution Grade: A
 
 
[+][-]08.21.2002 at 12:31PM PDT, ID: 7234383

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