hBitmapを使って.bmpファイルを保存するC Win32でCreateDIBSection（）を実行します。

Question

次のコードがあります。この情報を使用して、フレームグラバーからメインメモリにコピーされたイメージであるメモリからのデータを示す1つの.bmpファイルを作成したいと思います。 はあなた

LPSTR CreateBMP(HWND hAppWnd, int nImageType) 

{
void *型pWinGBits = NULLをありがとう。 int i; Z_BITMAPINFO zWinGHeader;手動でビットマップを構築する必要があるので、CでDIB

// create DC for bitmap. 
hDCBits = CreateCompatibleDC(ghDCMain); 

switch (nImageType) 
{ 
    case bayer_filter: 
    zWinGHeader.bmiHeader.biSize   = sizeof(BITMAPINFOHEADER); 
    zWinGHeader.bmiHeader.biPlanes   = 1; 
    zWinGHeader.bmiHeader.biClrImportant = 0; 
    zWinGHeader.bmiHeader.biHeight   = -lYSize; 
    zWinGHeader.bmiHeader.biWidth   = lXSize; 
    zWinGHeader.bmiHeader.biBitCount  = 32; 
    zWinGHeader.bmiHeader.biClrUsed   = 0;//3; 
    zWinGHeader.bmiHeader.biCompression  = BI_BITFIELDS; 
    zWinGHeader.bmiHeader.biSizeImage  = 0; 
    zWinGHeader.bmiColors[0].rgbBlue  = 0x00; 
    zWinGHeader.bmiColors[0].rgbGreen  = 0x00; 
    zWinGHeader.bmiColors[0].rgbRed   = 0xFF; 
    zWinGHeader.bmiColors[0].rgbReserved = 0x00; 

    zWinGHeader.bmiColors[1].rgbBlue  = 0x00; 
    zWinGHeader.bmiColors[1].rgbGreen  = 0xFF; 
    zWinGHeader.bmiColors[1].rgbRed   = 0x00; 
    zWinGHeader.bmiColors[1].rgbReserved = 0x00; 

    zWinGHeader.bmiColors[2].rgbBlue  = 0xFF; 
    zWinGHeader.bmiColors[2].rgbGreen  = 0x00; 
    zWinGHeader.bmiColors[2].rgbRed   = 0x00; 
    zWinGHeader.bmiColors[2].rgbReserved = 0x00; 
    break; 

    case color32: 
    zWinGHeader.bmiHeader.biSize   = sizeof(BITMAPINFOHEADER); 
    zWinGHeader.bmiHeader.biPlanes   = 1; 
    zWinGHeader.bmiHeader.biClrImportant = 0; 
    zWinGHeader.bmiHeader.biHeight   = -lYSize; 
    zWinGHeader.bmiHeader.biWidth   = lXSize/4; 
    zWinGHeader.bmiHeader.biBitCount  = 32; 
    zWinGHeader.bmiHeader.biClrUsed   = 0; 
    zWinGHeader.bmiHeader.biCompression  = BI_BITFIELDS; 
    zWinGHeader.bmiHeader.biSizeImage  = 0; 
    zWinGHeader.bmiColors[0].rgbBlue  = 0x00; 
    zWinGHeader.bmiColors[0].rgbGreen  = 0x00; 
    zWinGHeader.bmiColors[0].rgbRed   = 0xFF; 
    zWinGHeader.bmiColors[0].rgbReserved = 0x00; 

    zWinGHeader.bmiColors[1].rgbBlue  = 0x00; 
    zWinGHeader.bmiColors[1].rgbGreen  = 0xFF; 
    zWinGHeader.bmiColors[1].rgbRed   = 0x00; 
    zWinGHeader.bmiColors[1].rgbReserved = 0x00; 

    zWinGHeader.bmiColors[2].rgbBlue  = 0xFF; 
    zWinGHeader.bmiColors[2].rgbGreen  = 0x00; 
    zWinGHeader.bmiColors[2].rgbRed   = 0x00; 
    zWinGHeader.bmiColors[2].rgbReserved = 0x00; 
    break; 

    case color24: 
    zWinGHeader.bmiHeader.biSize   = sizeof(BITMAPINFOHEADER); 
    zWinGHeader.bmiHeader.biPlanes   = 1; 
    zWinGHeader.bmiHeader.biClrImportant = 0; 
    zWinGHeader.bmiHeader.biHeight   = -lYSize; 
    zWinGHeader.bmiHeader.biWidth   = lXSize/3; 
    zWinGHeader.bmiHeader.biBitCount  = 24; 
    zWinGHeader.bmiHeader.biClrUsed   = 0; 
    zWinGHeader.bmiHeader.biCompression  = BI_RGB; 
    zWinGHeader.bmiHeader.biSizeImage  = 0; 
    break; 

    case color3x16: 
    zWinGHeader.bmiHeader.biSize   = sizeof(BITMAPINFOHEADER); 
    zWinGHeader.bmiHeader.biPlanes   = 1; 
    zWinGHeader.bmiHeader.biClrImportant = 0; 
    zWinGHeader.bmiHeader.biHeight   = -lYSize; 
    zWinGHeader.bmiHeader.biWidth   = lXSize/6; 
    zWinGHeader.bmiHeader.biBitCount  = 32; 
    zWinGHeader.bmiHeader.biClrUsed   = 0; 
    zWinGHeader.bmiHeader.biCompression  = BI_BITFIELDS; 
    zWinGHeader.bmiHeader.biSizeImage  = 0; 
    zWinGHeader.bmiColors[0].rgbBlue  = 0x00; 
    zWinGHeader.bmiColors[0].rgbGreen  = 0x00; 
    zWinGHeader.bmiColors[0].rgbRed   = 0xFF; 
    zWinGHeader.bmiColors[0].rgbReserved = 0x00; 

    zWinGHeader.bmiColors[1].rgbBlue  = 0x00; 
    zWinGHeader.bmiColors[1].rgbGreen  = 0xFF; 
    zWinGHeader.bmiColors[1].rgbRed   = 0x00; 
    zWinGHeader.bmiColors[1].rgbReserved = 0x00; 

    zWinGHeader.bmiColors[2].rgbBlue  = 0xFF; 
    zWinGHeader.bmiColors[2].rgbGreen  = 0x00; 
    zWinGHeader.bmiColors[2].rgbRed   = 0x00; 
    zWinGHeader.bmiColors[2].rgbReserved = 0x00; 
    break; 

    case bw1x10: 
    // create bitmap-infoheader. 
    zWinGHeader.bmiHeader.biSize  = sizeof(BITMAPINFOHEADER); 
    zWinGHeader.bmiHeader.biPlanes  = 1; 
    zWinGHeader.bmiHeader.biBitCount = 8; 
    zWinGHeader.bmiHeader.biCompression = BI_RGB; 
    zWinGHeader.bmiHeader.biSizeImage = 0; 
    zWinGHeader.bmiHeader.biClrUsed  = 256; 
    zWinGHeader.bmiHeader.biClrImportant= 0; 
    zWinGHeader.bmiHeader.biHeight  = -lYSize; 
    zWinGHeader.bmiHeader.biWidth  = lXSize/2; 

    // create colortable fot bitmap (grayvalues). 
    for (i = 0; i < 256; i++) 
    { 
     zWinGHeader.bmiColors[i].rgbGreen = i; 
     zWinGHeader.bmiColors[i].rgbBlue = i; 
     zWinGHeader.bmiColors[i].rgbRed  = i; 

     zWinGHeader.bmiColors[i].rgbReserved = 0; 
    } 
    break; 

    default: 
    case bw8: 
    // create bitmap-infoheader. 
    zWinGHeader.bmiHeader.biSize  = sizeof(BITMAPINFOHEADER); 
    zWinGHeader.bmiHeader.biPlanes  = 1; 
    zWinGHeader.bmiHeader.biBitCount = 8; 
    zWinGHeader.bmiHeader.biCompression = BI_RGB; 
    zWinGHeader.bmiHeader.biSizeImage = 0; 
    zWinGHeader.bmiHeader.biClrUsed  = 256; 
    zWinGHeader.bmiHeader.biClrImportant= 0; 
    zWinGHeader.bmiHeader.biHeight  = -lYSize; 
    zWinGHeader.bmiHeader.biWidth  = lXSize; 

    // create colortable fot bitmap (grayvalues). 
    for (i = 0; i < 256; i++) 
    { 
     zWinGHeader.bmiColors[i].rgbGreen = i; 
     zWinGHeader.bmiColors[i].rgbBlue = i; 
     zWinGHeader.bmiColors[i].rgbRed  = i; 

     zWinGHeader.bmiColors[i].rgbReserved = 0; 
    } 
    break; 
} 

// cerate identity palette 
hPal = CreateIdentityPalette(zWinGHeader.bmiColors); 

// get new palette into DC and map into physical palette register. 
hOldPal = SelectPalette(ghDCMain, hPal, FALSE); 
RealizePalette(ghDCMain); 

// cerate DIB-Section f黵 direct access of image-data. 
hBitmap = CreateDIBSection(
    hDCBits,      // handle of device context 
    (BITMAPINFO *)&zWinGHeader,  // address of structure containing 
            // bitmap size, format and color data 
    DIB_RGB_COLORS,     // color data type indicator: RGB values 
            // or palette indices 
    &pWinGBits,      // pointer to variable to receive a pointer 
            // to the bitmap's bit values 
    NULL,       // optional handle to a file mapping object 
    0        // offset to the bitmap bit values within 
            // the file mapping object 
); 
// get bitmap into DC . 
hOldBitmap = (HBITMAP)SelectObject(hDCBits, hBitmap); 
return pWinGBits;   // return pointer to DIB 

}

Answer 1

のWin32 APIを使用して、画像ファイルにメモリやHBITMAP内の画像データから行くための最も簡単な方法は、GDI +です。イメージデータまたはHBITMAP（http://msdn.microsoft.com/en-us/library/ms536314%28v=vs.85%29.aspxを参照）からBitmapオブジェクトを作成し、Saveメソッドを使用してファイルを作成します（http://msdn.microsoft.com/en-us/library/ms535407%28v=vs.85%29.aspxを参照）。 C++を使用できない場合は、これらのメソッドもCから呼び出し可能な関数として存在します。

Answer 2

をceratingため// BITMAPINFOは、変換が巨大な痛みです。あなたがC++を使用することを許可されている場合は、あなたがATLからCImageを使用して（数行に）非常に簡単にこれを行うことができます

PBITMAPINFO CreateBitmapInfoStruct(HBITMAP hBmp) 
{ 
BITMAP bmp; 
PBITMAPINFO pbmi; 
WORD cClrBits; 
// Retrieve the bitmap color format, width, and height. 
if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp)) 
return NULL; 

// 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, the width must be DWORD aligned unless 
// the bitmap is RLE compressed. This example shows this. 
// For Windows 95/98/Me, the width must be WORD aligned unless the 
// bitmap is RLE compressed. 
pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) &amp; ~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(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) 
return; 

// 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)) 
{ 
return; 
} 

// 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) 
return; 
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) &amp;hdr, sizeof(BITMAPFILEHEADER), 
(LPDWORD) &amp;dwTmp, NULL)) 
{ 
return; 
} 

// Copy the BITMAPINFOHEADER and RGBQUAD array into the file. 
if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER) 
+ pbih->biClrUsed * sizeof (RGBQUAD), 
(LPDWORD) &amp;dwTmp, (NULL))) 
return; 

// Copy the array of color indices into the .BMP file. 
dwTotal = cb = pbih->biSizeImage; 
hp = lpBits; 
if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &amp;dwTmp,NULL)) 
return; 

// Close the .BMP file. 
if (!CloseHandle(hf)) 
return; 

// Free memory. 
GlobalFree((HGLOBAL)lpBits); 
} 


//code for saving bitmap 
HBITMAP hBitmap; 
HDC hdc; 
... 
PBITMAPINFO pBitmapInfo = CreateBitmapInfoStruct(hBitmap); 
CreateBMPFile(_T("c:\\temp\\picture.bmp"), pBitmapInfo, hBitmap, hdc); 

：Hereは、私はなかったことが過去に使用したコードです。

Answer 3

CreateDIBSection関数は、アプリケーションが直接書き込み可能なDIB *を作成します。この関数は、ビットマップビット値の位置へのポインタを与えます。

この電話はビットマップイメージを作成しません、なぜその機能を使用しますか？

• デバイスに依存しないビットマップは