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Returns the Windows HWND of the specified WHANDLE.
HWND_WhToHwnd(WHANDLE wh) WHANDLE wh; /* Window handle. */ |
Remarks
For more information on how to create an API library and integrate it with Visual FoxPro, see Accessing the Visual FoxPro API.
Example
The following example creates a window and then obtains the Windows HWND for the window with the callback _WhToHwnd(В ). Then, to verify the value returned by _WhToHwnd(В ), the example uses the HWND as an argument to a Windows function.
Visual FoxPro Code
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SET LIBRARY TO WHTOHWND | |
C Code
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#include <windows.h>
#include <pro_ext.h>
void putLong(long n, int width)
{
Value val;
val.ev_type = 'I';
val.ev_long = n;
val.ev_width = width;
_PutValue(&val);
}
FAR WhToHwndEx(ParamBlk FAR *parm)
{
RECT Rect;
HWND hwnd;
WHANDLE wh;
Value val;
wh = _WOpenP(10,10,120,240,CLOSE,WINDOW_SCHEME, (Scheme FAR *) 0,
WO_SYSTEMBORDER);
_WShow(wh);
// Get Windows window handle and use as a parameter
// to a Windows function
hwnd = _WhToHwnd(wh);
GetWindowRect(hwnd, &Rect); // Windows function
_PutStr("\ntop ="); putLong(Rect.top, 5);
_PutStr("\nleft ="); putLong(Rect.left, 5);
_PutStr("\nbottom ="); putLong(Rect.bottom, 5);
_PutStr("\nright ="); putLong(Rect.right, 5);
}
FoxInfo myFoxInfo[] = {
{"ONLOAD", WhToHwndEx, CALLONLOAD, ""},
};
FoxTable _FoxTable = {
(FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo
}; | |