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/*-----------------------------------------
HELLOBIT.C -- Bitmap Demonstration
(c) Charles Petzold, 1998
-----------------------------------------*/
#include <windows.h>
#include "resource.h"
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName [] = TEXT ("HelloBit") ;
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 = szAppName ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("HelloBit"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HBITMAP hBitmap ;
static HDC hdcMem ;
static int cxBitmap, cyBitmap, cxClient, cyClient, iSize = IDM_BIG ;
static TCHAR * szText = TEXT (" Hello, world! ") ;
HDC hdc ;
HMENU hMenu ;
int x, y ;
PAINTSTRUCT ps ;
SIZE size ;
switch (message)
{
case WM_CREATE:
// 窗口DC
hdc = GetDC (hwnd) ;
// 兼容窗口的内存DC
hdcMem = CreateCompatibleDC (hdc) ;
//得到字符串的长度和高度
GetTextExtentPoint32 (hdc, szText, lstrlen (szText), &size) ;
cxBitmap = size.cx ;
cyBitmap = size.cy ;
//创建一个兼容位图
hBitmap = CreateCompatibleBitmap (hdc, cxBitmap, cyBitmap) ;
//释放创建的窗口DC
ReleaseDC (hwnd, hdc) ;
// 把兼容位图选入到内存DC去
SelectObject (hdcMem, hBitmap) ;
TextOut (hdcMem, 0, 0, szText, lstrlen (szText)) ;
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_COMMAND:
hMenu = GetMenu (hwnd) ;
switch (LOWORD (wParam))
{
case IDM_BIG:
case IDM_SMALL:
CheckMenuItem (hMenu, iSize, MF_UNCHECKED) ;
iSize = LOWORD (wParam) ;
CheckMenuItem (hMenu, iSize, MF_CHECKED) ;
InvalidateRect (hwnd, NULL, TRUE) ;
break ;
}
return 0 ;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
switch (iSize)
{
case IDM_BIG:
// 拉伸位图,显示客户区
StretchBlt (hdc, 0, 0, cxClient, cyClient,
hdcMem, 0, 0, cxBitmap, cyBitmap, SRCCOPY) ;
break ;
case IDM_SMALL:
for (y = 0 ; y < cyClient ; y += cyBitmap)
for (x = 0 ; x < cxClient ; x += cxBitmap)
{
// 只能显示实际大小
BitBlt (hdc, x, y, cxBitmap, cyBitmap,
hdcMem, 0, 0, SRCCOPY) ;
}
break ;
}
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY:
DeleteDC (hdcMem) ;
DeleteObject (hBitmap) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
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