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存储我们可以用SaveBitmapToFile(HBITMAP hBitmap , LPSTR lpFileName)去完成
但是存储的结果是原来的图片,该如何解决呢void CBMPResizeDlg::OnShowBMP()
{
//select a bmp file
CFileDialog dlg(true, NULL, NULL,
OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
"BMP File(*.bmp)|*.bmp||");
if(dlg.DoModal()!=IDOK)
return;
HBITMAP bitmap;
bitmap = (HBITMAP) LoadImage(AfxGetInstanceHandle(), dlg.GetPathName(), IMAGE_BITMAP,
0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION);
HBITMAP oldBitMap;
CDC memDC;
memDC.CreateCompatibleDC(GetDC());
oldBitMap = (HBITMAP) memDC.SelectObject(bitmap);
//GetDC()->BitBlt(100, 100, 400, 300, &memDC, 0, 0, SRCCOPY);
GetDC()->StretchBlt(0, 0, 400, 300, &memDC, 0, 0, 800, 600, SRCCOPY);
SaveBitmapToFile(bitmap, "c:\\test.bmp"); memDC.SelectObject(oldBitMap);
}int SaveBitmapToFile(HBITMAP hBitmap , LPSTR lpFileName) //hBitmap 为刚才的屏幕位图句柄
{ //lpFileName 为位图文件名
HDC hDC; //设备描述表
int iBits; //当前显示分辨率下每个像素所占字节数
WORD wBitCount; //位图中每个像素所占字节数
//定义调色板大小, 位图中像素字节大小 ,
// 位图文件大小 , 写入文件字节数
DWORD dwPaletteSize=0, dwBmBitsSize,dwDIBSize, dwWritten;
BITMAP Bitmap;
//位图属性结构
BITMAPFILEHEADER bmfHdr;
//位图文件头结构
BITMAPINFOHEADER bi;
//位图信息头结构
LPBITMAPINFOHEADER lpbi;
//指向位图信息头结构
HANDLE fh, hDib, hPal,hOldPal=NULL;
//定义文件,分配内存句柄,调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else if (iBits <= 4)
wBitCount = 4;
else if (iBits <= 8)
wBitCount = 8;
else if (iBits <= 24)
wBitCount = 24;
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *
sizeof(RGBQUAD);
//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth *
wBitCount+31)/32)* 4
*Bitmap.bmHeight ;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+
dwPaletteSize+sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = GetDC(NULL);
hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
(LPSTR)lpbi + sizeof(BITMAPINFOHEADER) +dwPaletteSize,
(BITMAPINFO *) lpbi, DIB_RGB_COLORS);
//LPBITMAPINFOHEADER
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, (HPALETTE) hOldPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(lpFileName, GENERIC_WRITE,
0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_VALUE)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize = sizeof(BITMAPFILEHEADER)
+ sizeof(BITMAPINFOHEADER)
+ dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof
(BITMAPFILEHEADER)
+ (DWORD)sizeof(BITMAPINFOHEADER)
+ dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof
(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
}
void CBMPResizeDlg::OnShowBMP()
{
//select a bmp file
CFileDialog dlg(true, NULL, NULL,
OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
"BMP File(*.bmp)|*.bmp||");
if(dlg.DoModal()!=IDOK)
return;
HBITMAP bitmap;
bitmap = (HBITMAP) LoadImage(AfxGetInstanceHandle(), dlg.GetPathName(), IMAGE_BITMAP,
0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION);
bitmap = CopyImage(...................
SaveBitmapToFile(bitmap, "c:\\test.bmp"); memDC.SelectObject(oldBitMap);
}