WinQueryWindowDC: Difference between revisions
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==Related Functions== | ==Related Functions== | ||
* WinEnableWindow | * [[WinEnableWindow]] | ||
* [[WinIsThreadActive]] | * [[WinIsThreadActive]] | ||
* [[WinIsWindow]] | * [[WinIsWindow]] | ||
* WinIsWindowEnabled | * [[WinIsWindowEnabled]] | ||
* WinQueryDesktopWindow | * [[WinQueryDesktopWindow]] | ||
* WinQueryObjectWindow | * [[WinQueryObjectWindow]] | ||
* WinQueryWindowProcess | * [[WinQueryWindowProcess]] | ||
* WinQueryWindowRect | * [[WinQueryWindowRect]] | ||
* WinWindowFromDC | * [[WinWindowFromDC]] | ||
* WinWindowFromID | * [[WinWindowFromID]] | ||
* WinWindowFromPoint | * [[WinWindowFromPoint]] | ||
[[Category:Win]] | [[Category:Win]] | ||
Latest revision as of 18:39, 14 May 2025
This function returns the device context for a given window.
Syntax
WinQueryWindowDC(hwnd)
Parameters
- hwnd (HWND) - input
- Window handle.
Returns
- hdc (HDC) - returns
- Device-context handle.
- NULLHANDLE - Either WinOpenWindowDC has not been called for this window, or an error has occurred.
- Other - Device context handle.
Errors
Possible returns from WinGetLastError
- PMERR_INVALID_HWND (0x1001) :An invalid window handle was specified.
Remarks
A handle is returned only if a device context has been opened for the window with WinOpenWindowDC.
Example Code
This example shows how to check if WinOpenWindowDC has been called for this window.
#define INCL_WINWINDOWMGR
#include <os2.h>
HWND hwndClient; /* window handle. */
if(WinQueryWindowDC(hwndClient))
{
/* ... */
}