如何把显示在HDC上的内容保存为bmp文件? 如何把显示在HDC上的内容保存为bmp文件?谢谢. 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 #ifndef __SELFPHOTO_H__#define __SELFPHOTO_H__class SelfPhoto{public: void Take(HWND hWnd, HBITMAP* pBitmap) { ATLASSERT(::IsWindow(hWnd)); HDC hdc = ::GetWindowDC(hWnd); RECT rect; int c = ::GetWindowRect(hWnd, &rect); HDC hMemDC = ::CreateCompatibleDC(hdc); SIZE size; size.cx = rect.right - rect.left; size.cy = rect.bottom - rect.top; HBITMAP hBitmap = ::CreateCompatibleBitmap(hdc, size.cx, size.cy); HGDIOBJ hOldBitmap = ::SelectObject(hMemDC, hBitmap); ::BitBlt(hMemDC, 0, 0, size.cx, size.cy, hdc, 0, 0, SRCCOPY); ::SelectObject(hMemDC, hOldBitmap); ::DeleteObject(hMemDC); ::ReleaseDC(hWnd, hdc); *pBitmap = hBitmap; return; }public:#ifdef _DEBUG BOOL SaveToFile(HBITMAP hBitmap, LPCTSTR lpFileName) { 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 DWORD dwPaletteSize=0, //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 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 hWndDC = CreateDC(L"DISPLAY", NULL, NULL, NULL); hDC = ::CreateCompatibleDC(hWndDC) ; // int planes = GetDeviceCaps(hDC, PLANES); for DEBUG 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; else 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, (LPBITMAPINFO ) lpbi, DIB_RGB_COLORS); //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); return TRUE; }#endif};#endif VC 地址变换原理 vc实现查询80端口是否打开 还有就是CEdit里的字体改变了,但只显示了一半节,有点像CEdit的可视区域还是原始那么一点大小 求教~~实现在MFC视图里面显示一行滚动的文字?? [十万火急]200分求Excel嵌入单文档视图后菜单隐藏的解决方案 请教字符转换问题。 有谁能帮我用c或pascal 构造平衡的二叉排序树 请问哪位有WINDOWS记事本的源代码? 大吐血~~。。。: dongfa(阿东) 来拿分~ richedit2问题请教 宝宝快下出生了,也来求个名。 关于updatedata
#define __SELFPHOTO_H__
class SelfPhoto
{
public:
void Take(HWND hWnd, HBITMAP* pBitmap)
{
ATLASSERT(::IsWindow(hWnd)); HDC hdc = ::GetWindowDC(hWnd);
RECT rect;
int c = ::GetWindowRect(hWnd, &rect); HDC hMemDC = ::CreateCompatibleDC(hdc); SIZE size;
size.cx = rect.right - rect.left;
size.cy = rect.bottom - rect.top;
HBITMAP hBitmap = ::CreateCompatibleBitmap(hdc, size.cx, size.cy);
HGDIOBJ hOldBitmap = ::SelectObject(hMemDC, hBitmap);
::BitBlt(hMemDC, 0, 0, size.cx, size.cy, hdc, 0, 0, SRCCOPY); ::SelectObject(hMemDC, hOldBitmap);
::DeleteObject(hMemDC);
::ReleaseDC(hWnd, hdc); *pBitmap = hBitmap;
return;
}public:
#ifdef _DEBUG
BOOL SaveToFile(HBITMAP hBitmap, LPCTSTR lpFileName)
{
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
DWORD dwPaletteSize=0, //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
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 hWndDC = CreateDC(L"DISPLAY", NULL, NULL, NULL);
hDC = ::CreateCompatibleDC(hWndDC) ;
// int planes = GetDeviceCaps(hDC, PLANES); for DEBUG
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;
else
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,
(LPBITMAPINFO )
lpbi, DIB_RGB_COLORS); //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); return TRUE;
}
#endif
};
#endif