#include "stdafx.h"
#include "loadbmp.h"
#include <windows.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName [] = TEXT ("Demo") ;
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!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow ( szAppName, TEXT ("LoadBitmap Demo"),
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 hbmp;
static int cxClient, cyClient, cxSource, cySource;
BITMAP bitmap;
HDC hdc, hdcMem;
HINSTANCE hInstance;
PAINTSTRUCT ps;
BYTE * bits;
BITMAPINFO bh = {0};
int x, y;
int BytesPerLine;
switch (message)
{
case WM_CREATE:
hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
hbmp = LoadBitmap (hInstance, MAKEINTRESOURCE(IDB_BITMAP1));
GetObject (hbmp, sizeof (BITMAP), &bitmap) ;
cxSource = bitmap.bmWidth ;
cySource= bitmap.bmHeight ;
return 0 ; case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
hdcMem = CreateCompatibleDC (hdc) ;
SelectObject (hdcMem, hbmp) ;
//StretchBlt (hdc, 0, 0,cxSource, cySource, hdcMem, 0, 0, cxSource, cySource, MERGECOPY) ;
GetObject (hbmp, sizeof (BITMAP), &bitmap) ;
bh.bmiHeader.biSize = sizeof(bh.bmiHeader);
GetDIBits(hdc, hbmp, 0, 0, NULL, &bh, DIB_RGB_COLORS); // 查询BITMAPINFO
BytesPerLine = 4*((bitmap.bmWidth*24+31)/32); bh.bmiHeader.biBitCount = 24;
bh.bmiHeader.biCompression = BI_RGB;
bh.bmiHeader.biSizeImage = BytesPerLine * bitmap.bmHeight;
bh.bmiHeader.biHeight = bitmap.bmHeight;//高度
bh.bmiHeader.biPlanes = 1;
bh.bmiHeader.biWidth = bitmap.bmWidth;//宽度
bits = new BYTE[bh.bmiHeader.biSizeImage];
GetDIBits(hdc, hbmp, 0, bh.bmiHeader.biHeight , bits, &bh, DIB_RGB_COLORS);
// 获得整张位图的数据,保存到bits指向的空间
for(y=bh.bmiHeader.biHeight-1; y>=0; y--)
{
for(x=0; x<bh.bmiHeader.biWidth; x++)
{
BYTE bBlue = bits[3*bh.bmiHeader.biWidth*y+ 3*x+0];
BYTE bGreen = bits[3*bh.bmiHeader.biWidth*y+3*x+1];
BYTE bRed = bits[3*bh.bmiHeader.biWidth*y+ 3*x+2];
SetPixel(hdc, x, bh.bmiHeader.biHeight-y-1, RGB(bBlue, bGreen, bRed));
}
}
DeleteDC (hdcMem) ;
EndPaint (hwnd, &ps) ;
return 0 ; case WM_DESTROY:
DeleteObject (hbmp) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}图片变斜了,对其问题不太懂
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