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【C】保存位图
作者:Dezai.CN / 发布于2012/2/13/ 777
<div>
<span style="font-size: 13px;">static BOOL SaveBitmap (HBITMAP hBmp, const char* pszFile)</span>
<span style="font-size: 13px;">{   </span>
<span style="font-size: 13px;">BITMAP bmp;   </span>
<span style="font-size: 13px;">PBITMAPINFO pbmi;   </span>
<span style="font-size: 13px;">WORD    cClrBits;   /* </span><span style="font-size: 13px;">Retrieve the bitmap's color format, width, and height. */  </span>
<span style="font-size: 13px;">if (!</span><span style="font-size: 13px;">GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp))    </span>
<span style="font-size: 13px;"> return </span><span style="font-size: 13px;">FALSE;  </span>

<span style="font-size: 13px;"> /* Convert the color format to a count of bits. */  </span>
<span style="font-size: 13px;">cClrBits = </span><span style="font-size: 13px;">(WORD)(bmp.bmPlanes * bmp.bmBitsPixel);  </span>
<span style="font-size: 13px;">if (cClrBits == 1)     </span>
<span style="font-size: 13px;">cClrBits = 1;   </span>
<span style="font-size: 13px;">else if (cClrBits <= 4)    </span>
<span style="font-size: 13px;"> cClrBits = 4;  </span>
<span style="font-size: 13px;"> else if (cClrBits </span><span style="font-size: 13px;"><= 8)    </span>
<span style="font-size: 13px;">cClrBits = 8;   </span>
<span style="font-size: 13px;">else if (cClrBits <= 16)     </span>
<span style="font-size: 13px;">cClrBits = 16;   </span>
<span style="font-size: 13px;">else if </span><span style="font-size: 13px;">(cClrBits <= 24)    </span>
<span style="font-size: 13px;">cClrBits = 24;  </span>
<span style="font-size: 13px;"> else     cClrBits = 32;</span>

<span style="font-size: 13px;">  /*    * Allocate </span><span style="font-size: 13px;">memory for the BITMAPINFO structure. (This structure    *</span>
<span style="font-size: 13px;">contains a BITMAPINFOHEADER structure and an array of</span>
<span style="font-size: 13px;">RGBQUAD data    * structures.)      */   </span>
<span style="font-size: 13px;">if (cClrBits < 24)    </span>
<span style="font-size: 13px;"> pbmi = </span><span style="font-size: 13px;">(PBITMAPINFO) GlobalAlloc(LPTR,     </span><span style="font-size: 13px;">sizeof(BITMAPINFOHEADER) +     </span><span style="font-size: 13px;">sizeof(RGBQUAD) * (1 << cClrBits));  </span>
<span style="font-size: 13px;">/*    * There is no </span><span style="font-size: 13px;">RGBQUAD array for the 24-bit-per-pixel format.      */  </span>
<span style="font-size: 13px;"> else     </span>
<span style="font-size: 13px;">pbmi </span><span style="font-size: 13px;">= (PBITMAPINFO) GlobalAlloc(LPTR, </span><span style="font-size: 13px;">sizeof(BITMAPINFOHEADER));  </span>
<span style="font-size: 13px;">/* Initialize the fields in the </span><span style="font-size: 13px;">BITMAPINFO structure. */  </span>
<span style="font-size: 13px;">pbmi->bmiHeader.biSize = sizeof</span><span style="font-size: 13px;">(BITMAPINFOHEADER);  </span>
<span style="font-size: 13px;">pbmi->bmiHeader.biWidth = </span><span style="font-size: 13px;">bmp.bmWidth;  </span>
<span style="font-size: 13px;">pbmi->bmiHeader.biHeight = bmp.bmHeight;   </span>
<span style="font-size: 13px;">pbmi->bmiHeader.biPlanes = bmp.bmPlanes;   </span>
<span style="font-size: 13px;">pbmi-</span><span style="font-size: 13px;">>bmiHeader.biBitCount = bmp.bmBitsPixel;  </span>
<span style="font-size: 13px;">if (cClrBits < 24)     </span>
<span style="font-size: 13px;">pbmi->bmiHeader.biClrUsed = (1 << cClrBits);   </span>
<span style="font-size: 13px;">else     </span>
<span style="font-size: 13px;">pbmi-</span><span style="font-size: 13px;">>bmiHeader.biClrUsed = 0;  </span>
<span style="font-size: 13px;">/* If the bitmap is not compressed, set </span><span style="font-size: 13px;">the BI_RGB flag. */  </span>
<span style="font-size: 13px;">pbmi->bmiHeader.biCompression = BI_RGB;   </span>
<span style="font-size: 13px;">/*    * Compute the number of bytes in the array of color    * indices</span><span style="font-size: 13px;">and store the result in biSizeImage.    */  </span>
<span style="font-size: 13px;">pbmi-</span><span style="font-size: 13px;">>bmiHeader.biSizeImage = (pbmi->bmiHeader.biWidth + 7) /8 </span><span style="font-size: 13px;">* pbmi->bmiHeader.biHeight   </span><span style="font-size: 13px;"> * cClrBits;  </span>
<span style="font-size: 13px;"> /*    * Set biClrImportant to 0, indicating </span><span style="font-size: 13px;">that all of the    * device colors are important.    */   pbmi-</span><span style="font-size: 13px;">>bmiHeader.biClrImportant = 0;</span>
<span style="font-size: 13px;">  { /* C sucks */   </span>
<span style="font-size: 13px;">HANDLE hf;            </span>
<span style="font-size: 13px;">      /* file handle */   </span>
<span style="font-size: 13px;">BITMAPFILEHEADER hdr;      </span>
<span style="font-size: 13px;"> /* bitmap file-</span><span style="font-size: 13px;">header */  </span>
<span style="font-size: 13px;">PBITMAPINFOHEADER pbih;     </span>
<span style="font-size: 13px;">/* bitmap info-header </span><span style="font-size: 13px;">*/  </span>
<span style="font-size: 13px;">LPBYTE lpBits;             </span>
<span style="font-size: 13px;"> /* memory pointer */   </span>
<span style="font-size: 13px;">DWORD dwTotal;   </span>
<span style="font-size: 13px;">/* total count of bytes */   </span>
<span style="font-size: 13px;">DWORD cb;                   </span>
<span style="font-size: 13px;">/* </span><span style="font-size: 13px;">incremental count of bytes */  </span>
<span style="font-size: 13px;">DWORD dwTmp;   </span>
<span style="font-size: 13px;">HDC hDC;</span>
<span style="font-size: 13px;">  pbih = </span><span style="font-size: 13px;">(PBITMAPINFOHEADER) pbmi;  </span>
<span style="font-size: 13px;">lpBits = (LPBYTE) GlobalAlloc</span><span style="font-size: 13px;">(GMEM_FIXED, pbih->biSizeImage);  </span>
<span style="font-size: 13px;">if (!lpBits)     </span>
<span style="font-size: 13px;">return FALSE;   </span>
<span style="font-size: 13px;">/*    * Retrieve the color table (RGBQUAD array) and the bits    *</span><span style="font-size: 13px;">(array of palette indices) from the DIB.    */  </span>
<span style="font-size: 13px;">hDC = </span><span style="font-size: 13px;">CreateCompatibleDC(NULL);  </span>
<span style="font-size: 13px;">if (!GetDIBits(hDC, hBmp, 0, </span><span style="font-size: 13px;">(WORD) pbih->biHeight,    lpBits, pbmi,</span><span style="font-size: 13px;">DIB_RGB_COLORS))     return FALSE;  </span>
<span style="font-size: 13px;">/* Create the .BMP file. */   </span>
<span style="font-size: 13px;">hf = CreateFile (pszFile,      GENERIC_READ | </span><span style="font-size: 13px;">GENERIC_WRITE,      (DWORD) 0,      </span>
<span style="font-size: 13px;">(LPSECURITY_ATTRIBUTES) NULL,      </span>
<span style="font-size: 13px;">CREATE_ALWAYS,      FILE_ATTRIBUTE_NORMAL,  </span>
<span style="font-size: 13px;">    (HANDLE) NULL);</span>
<span style="font-size: 13px;">  if (hf == </span><span style="font-size: 13px;">INVALID_HANDLE_VALUE)    </span>
<span style="font-size: 13px;">return FALSE;  </span>
<span style="font-size: 13px;"> hdr.bfType = </span><span style="font-size: 13px;">0x4d42;       </span>
<span style="font-size: 13px;">/* 0x42 = "B" 0x4d = "M" */  </span>
<span style="font-size: 13px;"> /* Compute the size of the </span><span style="font-size: 13px;">entire file. */  </span>
<span style="font-size: 13px;">hdr.bfSize = (DWORD) (sizeof</span><span style="font-size: 13px;">(BITMAPFILEHEADER)    + pbih-</span><span style="font-size: 13px;">>biSize + pbih->biClrUsed    * sizeof</span><span style="font-size: 13px;">(RGBQUAD) + pbih->biSizeImage);  </span>
<span style="font-size: 13px;">hdr.bfReserved1 = 0;   </span>
<span style="font-size: 13px;">hdr.bfReserved2 = 0;   </span>
<span style="font-size: 13px;">/* Compute the offset to the array of color </span><span style="font-size: 13px;">indices. */   </span>
<span style="font-size: 13px;">hdr.bfOffBits = (DWORD) sizeof</span><span style="font-size: 13px;">(BITMAPFILEHEADER)      + pbih-</span><span style="font-size: 13px;">>biSize + pbih->biClrUsed      * sizeof</span><span style="font-size: 13px;">(RGBQUAD);  </span>
<span style="font-size: 13px;">/* Copy the BITMAPFILEHEADER into the .BMP </span><span style="font-size: 13px;">file. */   </span>
<span style="font-size: 13px;">if (!WriteFile(hf, (LPVOID) &hdr, sizeof</span><span style="font-size: 13px;">(BITMAPFILEHEADER),    (LPDWORD) &dwTmp,</span>
<span style="font-size: 13px;">(LPOVERLAPPED) NULL))     </span>
<span style="font-size: 13px;">return FALSE;   </span>
<span style="font-size: 13px;">/* Copy the </span><span style="font-size: 13px;">BITMAPINFOHEADER and RGBQUAD array into the file. */  </span>
<span style="font-size: 13px;"> if </span><span style="font-size: 13px;">(!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER) </span><span style="font-size: 13px;"> + pbih->biClrUsed * sizeof (RGBQUAD),     </span><span style="font-size: 13px;">(LPDWORD) &dwTmp, (LPOVERLAPPED) NULL))     </span>
<span style="font-size: 13px;">return </span><span style="font-size: 13px;">FALSE;  </span>
<span style="font-size: 13px;"> /* Copy the array of color indices into the .BMP file. */  </span>
<span style="font-size: 13px;">dwTotal = cb = pbih->biSizeImage;</span>
<span style="font-size: 13px;">  if (!WriteFile(hf, (LPSTR) </span><span style="font-size: 13px;">lpBits, (int) cb,    (LPDWORD) &dwTotal,</span><span style="font-size: 13px;">(LPOVERLAPPED) NULL))       return FALSE;</span>
<span style="font-size: 13px;">  /* Close the .BMP </span><span style="font-size: 13px;">file. */  </span>
<span style="font-size: 13px;">if (!CloseHandle(hf))     </span>
<span style="font-size: 13px;">return FALSE;</span>
<span style="font-size: 13px;">  /* Free memory. */   </span>
<span style="font-size: 13px;">GlobalFree((HGLOBAL)lpBits);   </span>
<span style="font-size: 13px;">GlobalFree((HGLOBAL)pbmi);</span>

<span style="font-size: 13px;">DeleteDC(hDC);   </span>
<span style="font-size: 13px;">} </span>
<span style="font-size: 13px;">/* C sucks */  </span>
<span style="font-size: 13px;"> return TRUE; </span>
<span style="font-size: 13px;">}</span>
</div>
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