Current window font ?

[vilius]

How do I get some window(control actually) font ?
I tried to do this by using:

HDC hdc1 = 0;
HGDIOBJ hgdio1 = 0;
LOGFONT fontInfo1 = {0};
int result1 = 0;

hdc1 = GetDC( (HWND)0xA0217 );
hgdio1 = GetCurrentObject( hdc1, OBJ_FONT );
result1 = GetObject( hgdio1, sizeof(LOGFONT), &fontInfo1 );

The fact is that this code doesn't retrieve CURRENT window font - it just returns "system" font. It returns always the same - doesn't matter that I changed font for this window - and I see that changed font now.

How do I retrieve current window font ?

thanks
Vilius

[ovidiucucu]

The "window font" is chaged by sending WM_SETFONT message. This is usually sent to a control (button, edit, etc) in order to tell which font to use.
In you want to retrieve it, then you have to send WM_GETFONT.

GetCurrentObject(hDC, OBJ_FONT) retrieves the font currently selected in a device context, which is a different stuff. If no font was previously selected in DC by a call of SelectObject, then fially you'll get the system font.

[vilius]

Hi,

Ok, so now I tried:

LRESULT r1 = 0;
r1 = SendMessage( (HWND)0x1502A6, WM_GETFONT, 0, 0 );

r1 is allways 0. Documentation for WM_GETFONT states that it could be 0 if system font is used. I took notepad.exe as example and selected some odd font - definitely not system font - result still 0.
I retrieved window handle using spy++ - and it's valid.
I try to get other process window font - could it be the problem ?

V

[ovidiucucu]

Most possible, you have used the handle of Notepad's main window.
In fact, the text editor is its child window, of class "Edit".
See this article: Controlling Notepad From C++ Applications

[vilius]

No I used edit controls window handle.
Anyway tried other windows of other programs - the same result.

[ovidiucucu]

Well, I have run the following test, both under Windows XP and Windows 7, and got the correct font face name.

#include <windows.h>
#include <TCHAR.h>
#include <stdio.h>

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
   HWND hWnd = ::FindWindow(_T("Notepad"), NULL);
   if(NULL == hWnd)
   {
      ::MessageBox(NULL, _T("Notepad not found"), _T("Test"), MB_OK);
      return 0;
   }
   hWnd = ::GetWindow(hWnd, GW_CHILD);
   if(NULL ==  hWnd)
   {
      ::MessageBox(NULL, _T("Child EDIT not found"), _T("Test"), MB_OK);
      return 0;
   }
   HFONT hFont = (HFONT)::SendMessage(hWnd, WM_GETFONT, 0, 0);
   if(NULL == hFont)
   {
      ::MessageBox(NULL, _T("WM_GETFONT returns NULL"), _T("Test"), MB_OK);
      return 0;
   }

   LOGFONT lf = {0};
   TCHAR pszMsg[128] = {0};

   BOOL bRet = ::GetObject(hFont, sizeof(LOGFONT), &lf);
   if(! bRet)
   {
      _stprintf(pszMsg, _T("GetObject failed. Error: %u"), ::GetLastError());
      ::MessageBox(NULL, pszMsg, _T("Test"), MB_OK);
      return 0;
   }

   _stprintf(pszMsg, _T("OK. Font face name is: '%s'"), lf.lfFaceName);
   ::MessageBox(NULL, pszMsg, _T("Test"), MB_OK);

   return 0;
}

Something else you are doing wrong.

[vilius]

Hello,

Well I figured it out - SendMessage returns 0 only when I use remote debugging.
I tried to launch program on local boxes(XP, win7) - no problem works as it should.

Any ideas why this happening - always thought that remote debbuging is 100% the same as local launch..

Vilius

[VladimirF]

Well, I have run the following test, both under Windows XP and Windows 7, and got the correct font face name.

Hi Ovidiu,
I am having hard time trying to understand how it works. I always thought that GDI object handles from one process have no meaning in another - was I wrong? Or are HFONT objects excluded? What if you create a font in one process and try to access it from another?
Thank you!