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Группа: Завсегдатай
Сообщений: 5613
Регистрация: 21.8.2005
Где: Владимир
Репутация: 7
Всего: 118
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вот делал когда-то (изначально функцию спер откуда-то, и доделал немного)... собственно более ничего не надо будет тебе имхо. | Код |
inline int GetFilePointer(HANDLE FileHandle)
{
return SetFilePointer(FileHandle, 0, 0, FILE_CURRENT);
}
#define ERROR_BREAK(x) throw (int)(x);
class CScreenShot
{
private:
CScreenShot();
private:
static BOOL getScreenshot(LPCTSTR FileName, HWND hwnd, HDC hdcFrom, LPRECT rect)
{
bool Success=false;
//HDC SurfDC=NULL; // GDI-compatible device context for the surface
HBITMAP OffscrBmp=NULL; // bitmap that is converted to a DIB
HDC OffscrDC=NULL; // offscreen DC that we can select OffscrBmp into
LPBITMAPINFO lpbi=NULL; // bitmap format info; used by GetDIBits
LPVOID lpvBits=NULL; // pointer to bitmap bits array
HANDLE BmpFile=INVALID_HANDLE_VALUE; // destination .bmp file
BITMAPFILEHEADER bmfh; // .bmp file header
try
{
// We need an HBITMAP to convert it to a DIB:
int Width = rect->right - rect->left;
int Height = rect->bottom - rect->top;
if ((OffscrBmp = CreateCompatibleBitmap(hdcFrom, Width, Height)) == NULL)
ERROR_BREAK(2);
// The bitmap is empty, so let's copy the contents of the surface to it.
// For that we need to select it into a device context. We create one.
if ((OffscrDC = CreateCompatibleDC(hdcFrom)) == NULL) ERROR_BREAK(3);
// Select OffscrBmp into OffscrDC:
HBITMAP OldBmp = (HBITMAP)SelectObject(OffscrDC, OffscrBmp);
// Now we can copy the contents of the surface to the offscreen bitmap:
BitBlt(OffscrDC, 0, 0, Width, Height, hdcFrom, 0, 0, SRCCOPY);
//SendMessage(hwnd, WM_PRINT, (WPARAM) OffscrDC , PRF_NONCLIENT | PRF_CHECKVISIBLE | PRF_CLIENT | PRF_ERASEBKGND | PRF_CHILDREN);
// We don't need SurfDC anymore. Free it:
// GetDIBits requires format info about the bitmap. We can have GetDIBits
// fill a structure with that info if we pass a NULL pointer for lpvBits:
// Reserve memory for bitmap info (BITMAPINFOHEADER + largest possible
// palette):
if ((lpbi = (LPBITMAPINFO)(new char[sizeof(BITMAPINFOHEADER) +
256 * sizeof(RGBQUAD)])) == NULL) ERROR_BREAK(4);
ZeroMemory(&lpbi->bmiHeader, sizeof(BITMAPINFOHEADER));
lpbi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
// Get info but first de-select OffscrBmp because GetDIBits requires it:
SelectObject(OffscrDC, OldBmp);
if (!GetDIBits(OffscrDC, OffscrBmp, 0, Height, NULL, lpbi, DIB_RGB_COLORS))
ERROR_BREAK(5);
// Reserve memory for bitmap bits:
if ((lpvBits = new char[lpbi->bmiHeader.biSizeImage]) == NULL)
ERROR_BREAK(6);
// Have GetDIBits convert OffscrBmp to a DIB (device-independent bitmap):
if (!GetDIBits(OffscrDC, OffscrBmp, 0, Height, lpvBits, lpbi,
DIB_RGB_COLORS)) ERROR_BREAK(7);
// Create a file to save the DIB to:
if ((BmpFile = CreateFile(FileName,
GENERIC_WRITE,
0, NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL)) == INVALID_HANDLE_VALUE) ERROR_BREAK(8);
DWORD Written; // number of bytes written by WriteFile
// Write a file header to the file:
bmfh.bfType = 19778; // 'BM'
// bmfh.bfSize = ??? // we'll write that later
bmfh.bfReserved1 = bmfh.bfReserved2 = 0;
// bmfh.bfOffBits = ??? // we'll write that later
if (!WriteFile(BmpFile, &bmfh, sizeof(bmfh), &Written, NULL))
ERROR_BREAK(9);
if (Written < sizeof(bmfh)) ERROR_BREAK(9);
// Write BITMAPINFOHEADER to the file:
if (!WriteFile(BmpFile, &lpbi->bmiHeader, sizeof(BITMAPINFOHEADER),
&Written, NULL)) ERROR_BREAK(10);
if (Written < sizeof(BITMAPINFOHEADER)) ERROR_BREAK(10);
// Calculate size of palette:
int PalEntries;
// 16-bit or 32-bit bitmaps require bit masks:
if (lpbi->bmiHeader.biCompression == BI_BITFIELDS) PalEntries = 3;
else
// bitmap is palettized?
PalEntries = (lpbi->bmiHeader.biBitCount <= 8) ?
// 2^biBitCount palette entries max.:
(int)(1 << lpbi->bmiHeader.biBitCount)
// bitmap is TrueColor -> no palette:
: 0;
// If biClrUsed use only biClrUsed palette entries:
if (lpbi->bmiHeader.biClrUsed) PalEntries = lpbi->bmiHeader.biClrUsed;
// Write palette to the file:
if (PalEntries)
{
if (!WriteFile(BmpFile, &lpbi->bmiColors, PalEntries * sizeof(RGBQUAD),
&Written, NULL)) ERROR_BREAK(11);
if (Written < PalEntries * sizeof(RGBQUAD)) ERROR_BREAK(11);
}
// The current position in the file (at the beginning of the bitmap bits)
// will be saved to the BITMAPFILEHEADER:
bmfh.bfOffBits = GetFilePointer(BmpFile);
// Write bitmap bits to the file:
if (!WriteFile(BmpFile, lpvBits, lpbi->bmiHeader.biSizeImage,
&Written, NULL)) ERROR_BREAK(12);
if (Written < lpbi->bmiHeader.biSizeImage) ERROR_BREAK(12);
// The current pos. in the file is the final file size and will be saved:
bmfh.bfSize = GetFilePointer(BmpFile);
// We have all the info for the file header. Save the updated version:
SetFilePointer(BmpFile, 0, 0, FILE_BEGIN);
if (!WriteFile(BmpFile, &bmfh, sizeof(bmfh), &Written, NULL))
ERROR_BREAK(13);
if (Written < sizeof(bmfh)) ERROR_BREAK(13);
Success = true;
}
catch (int &errorcode)
{
TCHAR Buf[100];
wsprintf(Buf, TEXT("Screenshot error #%i"), errorcode);
OutputDebugString(Buf);
}
catch (...)
{
OutputDebugString(TEXT("Screenshot error"));
}
if (OffscrDC) DeleteDC(OffscrDC);
if (OffscrBmp) DeleteObject(OffscrBmp);
if (lpbi) delete[] lpbi;
if (lpvBits) delete[] lpvBits;
if (BmpFile != INVALID_HANDLE_VALUE) CloseHandle(BmpFile);
return Success;
}
public:
static BOOL getScreenshot(LPCTSTR FileName, HWND hwndActive)
{
BOOL rv = FALSE;
if(IsWindow(hwndActive)){
HDC hdc = GetWindowDC(hwndActive);
RECT rect;
GetWindowRect(hwndActive, &rect);
rv = getScreenshot(FileName, hwndActive, hdc, &rect);
ReleaseDC(hwndActive, hdc);
}
else{
throw TEXT("Invalid window handle while getScreenshot()");
}
return rv;
}
static BOOL getActiveWindow(LPCTSTR FileName)
{
HWND hwndActive = GetForegroundWindow();
return getScreenshot(FileName, hwndActive);
}
static BOOL getDesktopWindow(LPCTSTR FileName)
{
HWND hwndActive = GetDesktopWindow();
return getScreenshot(FileName, hwndActive);
}
};
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