subclass.c File Reference

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

Include dependency graph for subclass.c:

Go to the source code of this file.

Functions
LRESULT WINAPI	UnicodeWndProc (HWND, UINT, WPARAM, LPARAM)
LRESULT WINAPI	UnicodeSubclassProc (HWND, UINT, WPARAM, LPARAM)
LRESULT WINAPI	AnsiSubclassProc (HWND, UINT, WPARAM, LPARAM)
int WINAPI	WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)

Variables
static WNDPROC	SavedWndProcW
static WNDPROC	SavedWndProcA

Function Documentation

AnsiSubclassProc()

LRESULT CALLBACK AnsiSubclassProc	(	HWND	hWnd,
		UINT	msg,
		WPARAM	wParam,
		LPARAM	lParam
	)

Definition at line 155 of file subclass.c.

{
  LRESULT Result;
 
  switch(msg)
    {
      case WM_GETTEXT:
        printf("AnsiSubclassProc calling SavedWindowProcA\n");
        Result = CallWindowProcA(SavedWndProcA, hWnd, msg, wParam, lParam);
        printf("AnsiSubclassProc Ansi window text \"%s\"\n", (LPSTR) lParam);
        break;
      default:
        Result = CallWindowProcA(SavedWndProcA, hWnd, msg, wParam, lParam);
        break;
    }
 
  return Result;
}

Referenced by WinMain().

UnicodeSubclassProc()

LRESULT CALLBACK UnicodeSubclassProc	(	HWND	hWnd,
		UINT	msg,
		WPARAM	wParam,
		LPARAM	lParam
	)

Definition at line 136 of file subclass.c.

{
  LRESULT Result;
 
  switch(msg)
    {
      case WM_GETTEXT:
        printf("UnicodeSubclassProc calling SavedWindowProc\n");
        Result = CallWindowProcW(SavedWndProcW, hWnd, msg, wParam, lParam);
        printf("UnicodeSubclassProc Unicode window text \"%S\"\n", (LPWSTR) lParam);
        break;
      default:
        Result = CallWindowProcW(SavedWndProcW, hWnd, msg, wParam, lParam);
        break;
    }
 
  return Result;
}

Referenced by WinMain().

UnicodeWndProc()

LRESULT CALLBACK UnicodeWndProc	(	HWND	hWnd,
		UINT	msg,
		WPARAM	wParam,
		LPARAM	lParam
	)

Definition at line 117 of file subclass.c.

{
  LRESULT Result;
 
  switch(msg)
    {
      case WM_GETTEXT:
        printf("UnicodeWndProc calling DefWindowProcW\n");
        Result = DefWindowProcW(hWnd, msg, wParam, lParam);
        printf("UnicodeWndProc Unicode window text \"%S\"\n", (LPWSTR) lParam);
        break;
      default:
        Result = DefWindowProcW(hWnd, msg, wParam, lParam);
        break;
    }
 
  return Result;
}

Referenced by WinMain().

WinMain()

int WINAPI WinMain	(	HINSTANCE	hInstance,
		HINSTANCE	hPrevInstance,
		LPSTR	lpszCmdLine,
		int	nCmdShow
	)

Definition at line 12 of file subclass.c.

{
  WNDCLASSW wc;
  HWND hWnd;
  WCHAR WindowTextW[256];
  char WindowTextA[256];
 
  wc.lpszClassName = L"UnicodeClass";
  wc.lpfnWndProc = UnicodeWndProc;
  wc.style = 0;
  wc.hInstance = hInstance;
  wc.hIcon = NULL;
  wc.hCursor = NULL;
  wc.hbrBackground = NULL;
  wc.lpszMenuName = NULL;
  wc.cbClsExtra = 0;
  wc.cbWndExtra = 0;
  if (RegisterClassW(&wc) == 0)
    {
      fprintf(stderr, "RegisterClassW failed (last error 0x%lx)\n",
          GetLastError());
      return 1;
    }
  printf("Unicode class registered, WndProc = 0x%p\n", wc.lpfnWndProc);
 
  hWnd = CreateWindowA("UnicodeClass",
               "Unicode Window",
               WS_OVERLAPPEDWINDOW,
               0,
               0,
               CW_USEDEFAULT,
               CW_USEDEFAULT,
               NULL,
               NULL,
               hInstance,
               NULL);
  if (hWnd == NULL)
    {
      fprintf(stderr, "CreateWindowA failed (last error 0x%lx)\n",
          GetLastError());
      return 1;
    }
 
  printf("Window created, IsWindowUnicode returns %s\n", IsWindowUnicode(hWnd) ? "TRUE" : "FALSE");
 
  printf("Calling GetWindowTextW\n");
  if (! GetWindowTextW(hWnd, WindowTextW, sizeof(WindowTextW) / sizeof(WindowTextW[0])))
    {
      fprintf(stderr, "GetWindowTextW failed (last error 0x%lx)\n", GetLastError());
      return 1;
    }
  printf("GetWindowTextW returned Unicode string \"%S\"\n", WindowTextW);
 
  printf("Calling GetWindowTextA\n");
  if (! GetWindowTextA(hWnd, WindowTextA, sizeof(WindowTextA) / sizeof(WindowTextA[0])))
    {
      fprintf(stderr, "GetWindowTextA failed (last error 0x%lx)\n", GetLastError());
      return 1;
    }
  printf("GetWindowTextA returned Ansi string \"%s\"\n", WindowTextA);
  printf("\n");
 
  SavedWndProcW = (WNDPROC) GetWindowLongPtrW(hWnd, GWLP_WNDPROC);
  printf("GetWindowLongW returned 0x%p\n", SavedWndProcW);
  SavedWndProcA = (WNDPROC) GetWindowLongPtrA(hWnd, GWLP_WNDPROC);
  printf("GetWindowLongA returned 0x%p\n", SavedWndProcA);
  printf("\n");
 
  printf("Subclassing window using SetWindowLongW, new WndProc 0x%p\n", UnicodeSubclassProc);
  SetWindowLongPtrW(hWnd, GWLP_WNDPROC, (LONG_PTR) UnicodeSubclassProc);
  printf("After subclass, IsWindowUnicode %s, WndProcA 0x%lx, WndProcW 0x%lx\n",
         IsWindowUnicode(hWnd) ? "TRUE" : "FALSE", GetWindowLongPtrA(hWnd, GWLP_WNDPROC),
         GetWindowLongPtrW(hWnd, GWLP_WNDPROC));
 
  printf("Calling GetWindowTextW\n");
  if (! GetWindowTextW(hWnd, WindowTextW, sizeof(WindowTextW) / sizeof(WindowTextW[0])))
    {
      fprintf(stderr, "GetWindowTextW failed (last error 0x%lx)\n", GetLastError());
      return 1;
    }
  printf("GetWindowTextW returned Unicode string \"%S\"\n", WindowTextW);
  printf("\n");
 
  printf("Subclassing window using SetWindowLongA, new WndProc 0x%p\n", AnsiSubclassProc);
  SetWindowLongPtrA(hWnd, GWLP_WNDPROC, (LONG_PTR) AnsiSubclassProc);
  printf("After subclass, IsWindowUnicode %s, WndProcA 0x%lx, WndProcW 0x%lx\n",
         IsWindowUnicode(hWnd) ? "TRUE" : "FALSE", GetWindowLongPtrA(hWnd, GWLP_WNDPROC),
         GetWindowLongPtrW(hWnd, GWLP_WNDPROC));
 
  printf("Calling GetWindowTextW\n");
  if (! GetWindowTextW(hWnd, WindowTextW, sizeof(WindowTextW) / sizeof(WindowTextW[0])))
    {
      fprintf(stderr, "GetWindowTextW failed (last error 0x%lx)\n", GetLastError());
      return 1;
    }
  printf("GetWindowTextW returned Unicode string \"%S\"\n", WindowTextW);
 
  DestroyWindow(hWnd);
 
  return 0;
}

Variable Documentation

SavedWndProcA

WNDPROC SavedWndProcA

static

Definition at line 9 of file subclass.c.

Referenced by AnsiSubclassProc(), and WinMain().

SavedWndProcW

WNDPROC SavedWndProcW

static

Definition at line 8 of file subclass.c.

Referenced by UnicodeSubclassProc(), and WinMain().