VC Tips One: Get window handle, control ID, DC, etc.

1. Gets the handle to the current cursor's window and obtains the ID list of the window control:

HWND hwnd =:: GetFocus ();
int IID =:: GetDlgCtrlID (HWND);
if (IID = = idc_edit_cfgdata)//Idc_edit_cfgdata is the ID of a Eidt control

{

......

}

2. When you have more than one dialog box, get the handle of the main dialog box in the Child dialog box:

HWND hwnd = AfxGetApp ()->getmainwnd ()->getsafehwnd ();

:: SendMessage (HWND,WM_CONFIGURE_EVENT,A,B); WM_CONFIGURE_EVENT,A,B a message for the main dialog box

3. Get a DC for a control:

CDC * PDC;
PDC = GetDlgItem (idc_bmp_display)->getdc (); Get the picture control DC

HDC HDC;
HDC = Pdc->getsafehdc (); Turn the CDC into a HDC