我的程序:
CDC * mydc;
mydc->GetDC();
CDC MemDC; //首先定义一个显示设备对象
CBitmap MemBitmap;//定义一个位图对象
MemDC.CreateCompatibleDC(NULL);
MemBitmap.CreateCompatibleBitmap(mydc,Bmp_Width,Bmp_Height);
CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap);
.....
绘图部分;
.......
mydc->BitBlt(0,0,picwidth,picheight,&MemDC,0,0,SRCCOPY);
HBITMAP h_bitmap=(HBITMAP)SelectObject(MemDC.m_hDC,( HBITMAP)(pOldBit->m_hObject));
MemBitmap.DeleteObject();
MemDC.DeleteDC();
我想利用返回的 h_bitmap句柄保存至文件,不知可行否?
CDC * mydc;
mydc->GetDC();
CDC MemDC; //首先定义一个显示设备对象
CBitmap MemBitmap;//定义一个位图对象
MemDC.CreateCompatibleDC(NULL);
MemBitmap.CreateCompatibleBitmap(mydc,Bmp_Width,Bmp_Height);
CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap);
.....
绘图部分;
.......
mydc->BitBlt(0,0,picwidth,picheight,&MemDC,0,0,SRCCOPY);
HBITMAP h_bitmap=(HBITMAP)SelectObject(MemDC.m_hDC,( HBITMAP)(pOldBit->m_hObject));
MemBitmap.DeleteObject();
MemDC.DeleteDC();
我想利用返回的 h_bitmap句柄保存至文件,不知可行否?
{
BITMAP bmp;
PBITMAPINFO pbmi;
WORD cClrBits; // Retrieve the bitmap's color format, width, and height.
if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp))
errhandler("GetObject", hwnd); // Convert the color format to a count of bits.
cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel);
if (cClrBits == 1)
cClrBits = 1;
else if (cClrBits <= 4)
cClrBits = 4;
else if (cClrBits <= 8)
cClrBits = 8;
else if (cClrBits <= 16)
cClrBits = 16;
else if (cClrBits <= 24)
cClrBits = 24;
else cClrBits = 32; // Allocate memory for the BITMAPINFO structure. (This structure
// contains a BITMAPINFOHEADER structure and an array of RGBQUAD
// data structures.) if (cClrBits != 24)
pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
sizeof(BITMAPINFOHEADER) +
sizeof(RGBQUAD) * (1<< cClrBits)); // There is no RGBQUAD array for the 24-bit-per-pixel format. else
pbmi = (PBITMAPINFO) LocalAlloc(LPTR,
sizeof(BITMAPINFOHEADER)); // Initialize the fields in the BITMAPINFO structure. pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pbmi->bmiHeader.biWidth = bmp.bmWidth;
pbmi->bmiHeader.biHeight = bmp.bmHeight;
pbmi->bmiHeader.biPlanes = bmp.bmPlanes;
pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel;
if (cClrBits < 24)
pbmi->bmiHeader.biClrUsed = (1<<cClrBits); // If the bitmap is not compressed, set the BI_RGB flag.
pbmi->bmiHeader.biCompression = BI_RGB; // Compute the number of bytes in the array of color
// indices and store the result in biSizeImage.
// For Windows NT/2000, the width must be DWORD aligned unless
// the bitmap is RLE compressed. This example shows this.
// For Windows 95/98, the width must be WORD aligned unless the
// bitmap is RLE compressed.
pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8
* pbmi->bmiHeader.biHeight;
// Set biClrImportant to 0, indicating that all of the
// device colors are important.
pbmi->bmiHeader.biClrImportant = 0;
return pbmi;
}
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi,
HBITMAP hBMP, HDC hDC)
{
HANDLE hf; // file handle
BITMAPFILEHEADER hdr; // bitmap file-header
PBITMAPINFOHEADER pbih; // bitmap info-header
LPBYTE lpBits; // memory pointer
DWORD dwTotal; // total count of bytes
DWORD cb; // incremental count of bytes
BYTE *hp; // byte pointer
DWORD dwTmp; pbih = (PBITMAPINFOHEADER) pbi;
lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage); if (!lpBits)
errhandler("GlobalAlloc", hwnd); // Retrieve the color table (RGBQUAD array) and the bits
// (array of palette indices) from the DIB.
if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi,
DIB_RGB_COLORS))
{
errhandler("GetDIBits", hwnd);
} // Create the .BMP file.
hf = CreateFile(pszFile,
GENERIC_READ | GENERIC_WRITE,
(DWORD) 0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
(HANDLE) NULL);
if (hf == INVALID_HANDLE_VALUE)
errhandler("CreateFile", hwnd);
hdr.bfType = 0x4d42; // 0x42 = "B" 0x4d = "M"
// Compute the size of the entire file.
hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed
* sizeof(RGBQUAD) + pbih->biSizeImage);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0; // Compute the offset to the array of color indices.
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed
* sizeof (RGBQUAD); // Copy the BITMAPFILEHEADER into the .BMP file.
if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),
(LPDWORD) &dwTmp, NULL))
{
errhandler("WriteFile", hwnd);
} // Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)
+ pbih->biClrUsed * sizeof (RGBQUAD),
(LPDWORD) &dwTmp, ( NULL))
errhandler("WriteFile", hwnd); // Copy the array of color indices into the .BMP file.
dwTotal = cb = pbih->biSizeImage;
hp = lpBits;
if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))
errhandler("WriteFile", hwnd); // Close the .BMP file.
if (!CloseHandle(hf))
errhandler("CloseHandle", hwnd); // Free memory.
GlobalFree((HGLOBAL)lpBits);
}
www.CodeGuru.com能搜到
再利用SaveBitmap()函数即可。
http://www.codeproject.com/bitmap/gditutorial.asp
http://www.codeproject.com/bitmap/cximage.asp