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| BOOL WriteBmp(const TSTRING &strFile, const std::vector<BYTE> &vtData, const SIZE &sizeImg);
BOOL WriteBmp(const TSTRING &strFile, HDC hdc);
BOOL WriteBmp(const TSTRING &strFile, HDC hdc, const RECT &rcDC);
BOOL WriteBmp(const TSTRING &strFile, const std::vector<BYTE> &vtData, const SIZE &sizeImg)
{
BITMAPINFOHEADER bmInfoHeader = { 0 };
bmInfoHeader.biSize = sizeof(BITMAPINFOHEADER);
bmInfoHeader.biWidth = sizeImg.cx;
bmInfoHeader.biHeight = sizeImg.cy;
bmInfoHeader.biPlanes = 1;
bmInfoHeader.biBitCount = 24;
BITMAPFILEHEADER bmFileHeader = { 0 };
bmFileHeader.bfType = 0x4d42;
bmFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
bmFileHeader.bfSize = bmFileHeader.bfOffBits + ((bmInfoHeader.biWidth * bmInfoHeader.biHeight) * 3);
HANDLE hFile = CreateFile(strFile.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
return FALSE;
}
DWORD dwWrite = 0;
WriteFile(hFile, &bmFileHeader, sizeof(BITMAPFILEHEADER), &dwWrite, NULL);
WriteFile(hFile, &bmInfoHeader, sizeof(BITMAPINFOHEADER), &dwWrite, NULL);
WriteFile(hFile, &vtData[0], vtData.size(), &dwWrite, NULL);
CloseHandle(hFile);
return TRUE;
}
BOOL WriteBmp(const TSTRING &strFile, HDC hdc)
{
int iWidth = GetDeviceCaps(hdc, HORZRES);
int iHeight = GetDeviceCaps(hdc, VERTRES);
RECT rcDC = { 0,0,iWidth,iHeight };
return WriteBmp(strFile, hdc, rcDC);
}
BOOL WriteBmp(const TSTRING &strFile, HDC hdc, const RECT &rcDC)
{
BOOL bRes = FALSE;
BITMAPINFO bmpInfo = { 0 };
BYTE *pData = NULL;
SIZE sizeImg = { 0 };
HBITMAP hBmp = NULL;
std::vector<BYTE> vtData;
HGDIOBJ hOldObj = NULL;
HDC hdcMem = NULL;
bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmpInfo.bmiHeader.biWidth = rcDC.right - rcDC.left;
bmpInfo.bmiHeader.biHeight = rcDC.bottom - rcDC.top;
bmpInfo.bmiHeader.biPlanes = 1;
bmpInfo.bmiHeader.biBitCount = 24;
hdcMem = CreateCompatibleDC(hdc);
if (hdcMem == NULL)
{
goto EXIT;
}
hBmp = CreateDIBSection(hdcMem, &bmpInfo, DIB_RGB_COLORS, reinterpret_cast<VOID **>(&pData), NULL, 0);
if (hBmp == NULL)
{
goto EXIT;
}
hOldObj = SelectObject(hdcMem, hBmp);
sizeImg.cx = bmpInfo.bmiHeader.biWidth;
sizeImg.cy = bmpInfo.bmiHeader.biHeight;
StretchBlt(hdcMem,
0,
0,
sizeImg.cx,
sizeImg.cy,
hdc,
rcDC.left,
rcDC.top,
rcDC.right - rcDC.left + 1,
rcDC.bottom - rcDC.top + 1,
SRCCOPY);
vtData.resize(sizeImg.cx * sizeImg.cy * 3);
memcpy(&vtData[0], pData, vtData.size());
bRes = WriteBmp(strFile, vtData, sizeImg);
SelectObject(hdcMem, hOldObj);
EXIT:
if (hBmp != NULL)
{
DeleteObject(hBmp);
}
if (hdcMem != NULL)
{
DeleteDC(hdcMem);
}
return bRes;
}
int main()
{
HDC hdc = GetDC(0);
HDC hMemDC = CreateCompatibleDC(hdc);
SelectObject(hMemDC, CreateCompatibleBitmap(hdc, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN)));
BitBlt(hMemDC, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN), hdc, 0, 0, SRCCOPY);
WriteBmp(L"directWrite.bmp", hdc);
WriteBmp(L"copyWrite.bmp", hMemDC);
ReleaseDC(GetActiveWindow(), hdc);
DeleteDC(hMemDC);
return 0;
}
|
