怎样获取当前屏幕上的画面内容？ 并保存于BMP文件中

[富莱工作室]

类似Print Screen !

用DC可以实现吗， 请指点！！！

[薛定谔之死猫]

我有类似例子要不要

[vollin]

HDC GetDC(
HWND hWnd // handle to a window
);

Parameters
hWnd
Handle to the window whose device context is to be retrieved. If this value is NULL, GetDC retrieves the device context for the entire screen.

[vollin]

用GetDC(NULL)就可以得到屏幕的DC了，然后其中每点的色彩值都知道了，只要你再知道BMP格式就可以随意的存储了。

[快乐鹦鹉]

可以啊。

[vollin]

http://www.fantasiasoft.net/Documents/BMPFormat.htm
这篇文章有关BMP格式，很简单的，写一个以后都可以一直用。

[富莱工作室]

各位大哥感谢你们回答， 请帮我看一下如下代码：

HDC hdc = ::GetDC(NULL);
HDC hdc2 = ::CreateCompatibleDC(NULL);
HBITMAP bitmap = ::CreateCompatibleBitmap(NULL);
::SelectObject(hdc2, bitmap);
::BitBlt(hdc2, 0, 0, 800, 600, hdc, 0, 0, SRCCOPY);

能确认，屏幕的内容被拷入内存DC了吗？

[ymbymb]

如下操作
int nWidth , nHeight;
nWidth = GetSystemMetrics(SM_CXSCREEN);
nHeight = GetSystemMetrics(SM_CYSCREEN);

HDC hdc = ::GetDC(NULL);
HDC hdc2 = ::CreateCompatibleDC(NULL);
HBITMAP bitmap = ::CreateCompatibleBitmap(hdc, nWidth, nHeight);
::SelectObject(hdc2, bitmap);
::BitBlt(hdc2, 0, 0, nWidth, nHeight, hdc, 0, 0, SRCCOPY);
SaveBmp(bitmap, "desk.bmp");

[ymbymb]

BOOL SaveBmp(HBITMAP hBitmap, CString FileName)
{
HDC hDC;
int iBits;
WORD wBitCount;
DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0;
BITMAP Bitmap;
BITMAPFILEHEADER bmfHdr;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
HANDLE fh, hDib, hPal,hOldPal=NULL;

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;

[ymbymb]

dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight;
hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = ::SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight, (LPSTR)lpbi + sizeof(BITMAPINFOHEADER)
+dwPaletteSize, (BITMAPINFO *)lpbi, DIB_RGB_COLORS);
if (hOldPal)
{
::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_VALUE) return FALSE;
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;
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
WriteFile(fh, (LPSTR)lpbi, dwDIBSize, &dwWritten, NULL);
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}

[ymbymb]

呵呵,一个函数分了两次才贴完

[富莱工作室]

thank you

马上结贴

[hebets]

标记一下