问题:如何把api截取的图象保存为bmp文件? // win32程序 我正在写个win32的截屏软件但我只会在MFC下保存文件请问:如何把win32 api截取的图象保存为.bmp?(win32项目)请给个例子或文档谢谢! 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 我做过这样的程序,不过‘代码是VB的,但是思路是一样的,在这里和你说说思路,想要代码的话,我再贴出来api截取图像之后,一般是生成一个DC来保存的,所以首先使用GetCurrentObject获得hBitMap,然后再将获得的hBitMap填充倒一个事先建立好的BITMAP结构。这样就获得了height,width以及size的值。最后通过GetDIBits获得图像数据,然后按照bmp文件格式写入就可以了 用vc可以实现,以下是一个实例CBmpProc& CBmpProc::operator=(const CBmpProc& ds){ // 如果类中没有图像,直接返回 if (!ds.IsValid()) return *this; ASSERT(ds.m_pInfo); ASSERT(ds.m_pInfo->bmiHeader.biSize == sizeof(BITMAPINFOHEADER)); // 复制源图信息块 LPBITMAPINFO pInfo = (LPBITMAPINFO)CreateMemoryBlockFromAddress( (LPVOID)ds.m_pInfo); if (!pInfo) return *this; // 复制源图 CBitmap tempBmp; HBITMAP hBmp; HWND hWnd = ::GetDesktopWindow(); ASSERT(hWnd); HDC hDC = ::GetDC(hWnd); CDC dc; dc.Attach(hDC); if (tempBmp.CreateCompatibleBitmap(&dc, ds.Width(), ds.Height())) { CDC compDC, compDC2; CBitmap *pOldBmp, *pOldBmp2; // 创建与当前显示设备兼容的内存设备描述表 compDC.CreateCompatibleDC(NULL); compDC2.CreateCompatibleDC(NULL); pOldBmp = compDC.SelectObject((CBitmap*)&tempBmp); pOldBmp2= compDC2.SelectObject((CBitmap*)&ds); // 复制指定尺寸的源位图到目标位图 compDC.BitBlt(0, 0, ds.Width(), ds.Height(), &compDC2, 0, 0, SRCCOPY); compDC2.SelectObject(pOldBmp2); compDC.SelectObject(pOldBmp); hBmp = (HBITMAP)tempBmp.Detach(); // 如果分离操作失败,返回FALSE ASSERT(hBmp); if (!hBmp) { ::ReleaseDC(hWnd, dc.Detach()); ::free((void*)pInfo); return *this;; } ::ReleaseDC(hWnd, dc.Detach()); // 删除原来的图像,并且设置新的位图 if (!ClearAndSetData(IT_MEMORY,0,(LPCTSTR)"",pInfo,hBmp)) { ::free((void*)pInfo); ::DeleteObject(hBmp); return *this; } return *this; } else { ::ReleaseDC(hWnd, dc.Detach()); ::free((void*)pInfo); return *this;; }} HBITMAP WCDc::CopyDCToBitmap(HDC hScrDC, LPRECT lpRect){ HDC hMemDC; // 屏幕和内存设备描述表 HBITMAP hBitmap,hOldBitmap; // 位图句柄 int nX, nY, nX2, nY2; // 选定区域坐标 int nWidth, nHeight; // 位图宽度和高度 // 确保选定区域不为空矩形 if (IsRectEmpty(lpRect)) return NULL; //为屏幕创建设备描述表 // 获得选定区域坐标 nX = lpRect->left; nY = lpRect->top; nX2 = lpRect->right; nY2 = lpRect->bottom; nWidth = nX2 - nX; nHeight = nY2 - nY; //为屏幕设备描述表创建兼容的内存设备描述表 hMemDC = CreateCompatibleDC(hScrDC); // 创建一个与屏幕设备描述表兼容的位图 hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight); // 把新位图选到内存设备描述表中 hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap); // 把屏幕设备描述表拷贝到内存设备描述表中 StretchBlt(hMemDC,0,0,nWidth,nHeight,hScrDC,nX,nY,nWidth,nHeight,SRCCOPY); //得到屏幕位图的句柄 hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap); //清除 DeleteDC(hMemDC); DeleteObject(hOldBitmap); // 返回位图句柄 return hBitmap;} BOOL SaveBmp(HBITMAP hBitmap, CString FileName){ HDC hDC; //当前分辨率下每象素所占字节数 int iBits; //位图中每象素所占字节数 WORD wBitCount; //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=0, dwDIBSize=0, dwWritten=0; //位图属性结构 BITMAP Bitmap; //位图文件头结构 BITMAPFILEHEADER bmfHdr; //位图信息头结构 BITMAPINFOHEADER bi; //指向位图信息头结构 LPBITMAPINFOHEADER lpbi; //定义文件,分配内存句柄,调色板句柄 HANDLE fh, hDib, hPal,hOldPal=NULL; //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 wBitCount = 24; 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.biClrImportant = 0; bi.biClrUsed = 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); //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(FileName, 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;} 急~ 请帮帮我 CLISTCTRL插入数据不显示 Invalidate()函数可以完成重绘的工作吗? 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CBmpProc& CBmpProc::operator=(const CBmpProc& ds)
{
// 如果类中没有图像,直接返回
if (!ds.IsValid())
return *this; ASSERT(ds.m_pInfo);
ASSERT(ds.m_pInfo->bmiHeader.biSize == sizeof(BITMAPINFOHEADER)); // 复制源图信息块
LPBITMAPINFO pInfo = (LPBITMAPINFO)CreateMemoryBlockFromAddress(
(LPVOID)ds.m_pInfo);
if (!pInfo)
return *this; // 复制源图
CBitmap tempBmp;
HBITMAP hBmp; HWND hWnd = ::GetDesktopWindow();
ASSERT(hWnd);
HDC hDC = ::GetDC(hWnd);
CDC dc;
dc.Attach(hDC); if (tempBmp.CreateCompatibleBitmap(&dc, ds.Width(), ds.Height()))
{
CDC compDC, compDC2;
CBitmap *pOldBmp, *pOldBmp2; // 创建与当前显示设备兼容的内存设备描述表
compDC.CreateCompatibleDC(NULL);
compDC2.CreateCompatibleDC(NULL); pOldBmp = compDC.SelectObject((CBitmap*)&tempBmp);
pOldBmp2= compDC2.SelectObject((CBitmap*)&ds); // 复制指定尺寸的源位图到目标位图
compDC.BitBlt(0, 0, ds.Width(), ds.Height(),
&compDC2, 0, 0, SRCCOPY); compDC2.SelectObject(pOldBmp2);
compDC.SelectObject(pOldBmp); hBmp = (HBITMAP)tempBmp.Detach();
// 如果分离操作失败,返回FALSE
ASSERT(hBmp);
if (!hBmp)
{
::ReleaseDC(hWnd, dc.Detach());
::free((void*)pInfo);
return *this;;
}
::ReleaseDC(hWnd, dc.Detach()); // 删除原来的图像,并且设置新的位图
if (!ClearAndSetData(IT_MEMORY,0,(LPCTSTR)"",pInfo,hBmp))
{
::free((void*)pInfo);
::DeleteObject(hBmp);
return *this;
}
return *this;
}
else
{
::ReleaseDC(hWnd, dc.Detach());
::free((void*)pInfo); return *this;;
}
}
{ HDC hMemDC;
// 屏幕和内存设备描述表
HBITMAP hBitmap,hOldBitmap;
// 位图句柄
int nX, nY, nX2, nY2;
// 选定区域坐标
int nWidth, nHeight;
// 位图宽度和高度 // 确保选定区域不为空矩形
if (IsRectEmpty(lpRect))
return NULL;
//为屏幕创建设备描述表
// 获得选定区域坐标
nX = lpRect->left;
nY = lpRect->top;
nX2 = lpRect->right;
nY2 = lpRect->bottom; nWidth = nX2 - nX;
nHeight = nY2 - nY;
//为屏幕设备描述表创建兼容的内存设备描述表
hMemDC = CreateCompatibleDC(hScrDC);
// 创建一个与屏幕设备描述表兼容的位图
hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);
// 把新位图选到内存设备描述表中
hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);
// 把屏幕设备描述表拷贝到内存设备描述表中
StretchBlt(hMemDC,0,0,nWidth,nHeight,hScrDC,nX,nY,nWidth,nHeight,SRCCOPY);
//得到屏幕位图的句柄 hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);
//清除
DeleteDC(hMemDC);
DeleteObject(hOldBitmap);
// 返回位图句柄
return hBitmap;
}
{
HDC hDC;
//当前分辨率下每象素所占字节数
int iBits;
//位图中每象素所占字节数
WORD wBitCount;
//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=0, dwDIBSize=0, dwWritten=0;
//位图属性结构
BITMAP Bitmap;
//位图文件头结构
BITMAPFILEHEADER bmfHdr;
//位图信息头结构
BITMAPINFOHEADER bi;
//指向位图信息头结构
LPBITMAPINFOHEADER lpbi;
//定义文件,分配内存句柄,调色板句柄
HANDLE fh, hDib, hPal,hOldPal=NULL;
//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 wBitCount = 24;
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.biClrImportant = 0;
bi.biClrUsed = 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);
//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(FileName, 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;
}