WinQueryWindowDC

This function returns the device context for a given window.

Syntax

WinQueryWindowDC(hwnd)

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.

Possible returns from WinGetLastError

PMERR_INVALID_HWND (0x1001) :An invalid window handle was specified.

A handle is returned only if a device context has been opened for the window with WinOpenWindowDC.

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))
{
     /*  ...    */
}