?? showbit.c
字號:
/*-----------------------------------------------------------
SHOWBIT.C -- Shows bitmaps in BITLIB dynamic-link library
(c) Charles Petzold, 1998
-----------------------------------------------------------*/
#include <windows.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
TCHAR szAppName [] = TEXT ("ShowBit") ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName,
TEXT ("Show Bitmaps from BITLIB (Press Key)"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
if (!hwnd)
return 0 ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
void DrawBitmap (HDC hdc, int xStart, int yStart, HBITMAP hBitmap)
{
BITMAP bm ;
HDC hMemDC ;
POINT pt ;
hMemDC = CreateCompatibleDC (hdc) ;
SelectObject (hMemDC, hBitmap) ;
GetObject (hBitmap, sizeof (BITMAP), &bm) ;
pt.x = bm.bmWidth ;
pt.y = bm.bmHeight ;
BitBlt (hdc, xStart, yStart, pt.x, pt.y, hMemDC, 0, 0, SRCCOPY) ;
DeleteDC (hMemDC) ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HINSTANCE hLibrary ;
static int iCurrent = 1 ;
HBITMAP hBitmap ;
HDC hdc ;
PAINTSTRUCT ps ;
switch (message)
{
case WM_CREATE:
if ((hLibrary = LoadLibrary (TEXT ("BITLIB.DLL"))) == NULL)
{
MessageBox (hwnd, TEXT ("Can't load BITLIB.DLL."),
szAppName, 0) ;
return -1 ;
}
return 0 ;
case WM_CHAR:
if (hLibrary)
{
iCurrent ++ ;
InvalidateRect (hwnd, NULL, TRUE) ;
}
return 0 ;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
if (hLibrary)
{
hBitmap = LoadBitmap (hLibrary, MAKEINTRESOURCE (iCurrent)) ;
if (!hBitmap)
{
iCurrent = 1 ;
hBitmap = LoadBitmap (hLibrary,
MAKEINTRESOURCE (iCurrent)) ;
}
if (hBitmap)
{
DrawBitmap (hdc, 0, 0, hBitmap) ;
DeleteObject (hBitmap) ;
}
}
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY:
if (hLibrary)
FreeLibrary (hLibrary) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
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