🚀 go-pugleaf

"Remy Lebeau (TeamB)" wrote:

> A better approach would be to resize both the "Dialog" itself and the
> "Static" window when it is created to accomodate the added size of your
> asterik.  Then use SetWindowLong() to subclass the "Static" window's message
> procedure (or use a second hook) to do your asterik drawing only when the
> WM_PAINT message is actually received, after passing the WM_PAINT message to
> the default handler.

I've tried your suggestion (assuming I've done it right) with the following
code, but I still do not get the second line of the message.  Note:  the window
will be the right height (I've checked) because of the "\n " at the end of the
first line string.

#include <windows.h>
LRESULT CALLBACK (*old_window_proc)(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM
lParam);
LRESULT CALLBACK new_window_proc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM
lParam);

LRESULT CALLBACK hook_proc(int nCode, WPARAM wParam, LPARAM lParam);
int main(int argc, char **argv)
{
     HHOOK hook;

     hook = SetWindowsHookEx(WH_CBT,hook_proc,NULL,GetCurrentThreadId());

     MessageBox(NULL,"First line of error\n ","Error",MB_OK);
     UnhookWindowsHookEx(hook);
     return(0);
}
LRESULT CALLBACK hook_proc(int nCode, WPARAM wParam, LPARAM lParam)
{
     char class_name[100];
     HWND hwnd;

     if(nCode < 0)
          return(CallNextHookEx(NULL,nCode,wParam,lParam));

     if(nCode == HCBT_CREATEWND)
     {
          hwnd = (HWND)wParam;
          GetClassName(hwnd,class_name,sizeof(class_name));
          if(stricmp(class_name,"Static") == 0)
               old_window_proc = (WNDPROC)SetWindowLong(hwnd,GWL_WNDPROC,
                                                       (LONG)new_window_proc);
     }

     return(CallNextHookEx(NULL,nCode,wParam,lParam));
}
LRESULT CALLBACK new_window_proc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM
lParam)
{
     char *second_line = "Second line of error";
     RECT rect;
     HDC hdc;

     if(uMsg == WM_PAINT)
     {
          CallWindowProc(old_window_proc,hwnd,uMsg,wParam,lParam);
          hdc = GetDC(hwnd);

          GetWindowRect(hwnd,&rect);
          DrawText(hdc,second_line,strlen(second_line),&rect,
                   DT_SINGLELINE | DT_BOTTOM);

          ReleaseDC(hwnd,hdc);
          SetWindowLong(hwnd,GWL_WNDPROC,(LONG)old_window_proc);
          return(0);
     }

     return(CallWindowProc(old_window_proc,hwnd,uMsg,wParam,lParam));
}