怎样将内存缓冲区的数据保存为bmp文件? 怎样将内存缓冲区的数据保存为bmp文件?是不是要首先初始化文件头,信息头结构?将象素数据写入bmp文件时,一个象素占三个字节,怎样与R,G,B对应呢? 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 //SaveBitmapToFile 将图片存成文件 int SaveBitmapToFile(HBITMAP hBitmap, LPSTR lpFileName) { //lpFileName 为位图文件名 HDC hDC; //设备描述表 WORD wBitCount; //位图中每个像素所占字节数 //定义调色板大小, 位图中像素字节大小 , 位图文件大小 , 写入文件字节数 DWORD dwPaletteSize=0,dwBmBitsSize, dwWritten; BITMAP Bitmap; //位图属性结构 BITMAPFILEHEADER bmfHdr; //位图文件头结构 BITMAPINFOHEADER bi; //位图信息头结构 LPBITMAPINFOHEADER lpbi; //指向位图信息头结构 HANDLE fh,hPal; HPALETTE hOldPal=NULL; //定义文件,分配内存句柄,调色板句柄 //计算位图文件每个像素所占字节数 hDC = CreateDC("DISPLAY",NULL,NULL,NULL); //设置位图信息头结构 GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap); wBitCount = Bitmap.bmBitsPixel; //计算调色板大小 if (wBitCount <= 8) dwPaletteSize=(1<<wBitCount)*sizeof(RGBQUAD); bi.biSize = sizeof(BITMAPINFOHEADER); bi.biWidth = Bitmap.bmWidth; bi.biHeight = Bitmap.bmHeight; bi.biPlanes = 1; bi.biBitCount = wBitCount; bi.biCompression = BI_RGB; bi.biSizeImage = 0; bi.biXPelsPerMeter = 0; bi.biYPelsPerMeter = 0; bi.biClrUsed = 0; bi.biClrImportant = 0; dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight; //为位图内容分配内存/*xxxxxxxx计算位图大小分解一下(解释一下上面的语句)xxxxxxxxxxxxxxxxxxxx //每个扫描行所占的字节数应该为4的整数倍,具体算法为: int biWidth = (Bitmap.bmWidth*wBitCount) / 32; if((Bitmap.bmWidth*wBitCount) % 32) biWidth++; //不是整数倍的加1 biWidth *= 4;//到这里,计算得到的为每个扫描行的字节数。 dwBmBitsSize = biWidth * Bitmap.bmHeight;//得到大小xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*///int iSize = dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER);// hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER)); //HANDLE hHeap = HeapCreate(0,iSize,0); lpbi =(LPBITMAPINFOHEADER) HeapAlloc(GetProcessHeap(),HEAP_GENERATE_EXCEPTIONS,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER)); //lpbi =(LPBITMAPINFOHEADER) VirtualAlloc(NULL,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER),MEM_RESERVE | MEM_COMMIT,PAGE_READWRITE);DWORD dwError = GetLastError();DebugOut("LastError = %d",dwError);// lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); *lpbi = bi; // 处理调色板 hPal = GetStockObject(DEFAULT_PALETTE); if (hPal) { hDC = GetDC(NULL); hOldPal=SelectPalette(hDC,(HPALETTE)hPal,FALSE); RealizePalette(hDC); } // 获取该调色板下新的像素值 GetDIBits(hDC,hBitmap,0,(UINT)Bitmap.bmHeight,(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);//DIB_PAL_COLORS);//DIB_RGB_COLORS); //恢复调色板 if (hOldPal) { SelectPalette(hDC, hOldPal, TRUE); RealizePalette(hDC); ReleaseDC(NULL, hDC); } //创建位图文件 fh=CreateFile(lpFileName, GENERIC_WRITE,0, NULL, CREATE_NEW,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL); if (fh==INVALID_HANDLE_VALUE) return FALSE; // 设置位图文件头 bmfHdr.bfType = 0x4D42; // "BM" bmfHdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize; bmfHdr.bfReserved1 = 0; bmfHdr.bfReserved2 = 0; bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize; // 写入位图文件头 WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL); // 写入位图文件其余内容 WriteFile(fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize, &dwWritten, NULL); //清除 //GlobalUnlock(hDib); //GlobalFree(hDib); HeapFree(GetProcessHeap(),0,lpbi);// HeapDestroy(hHeap); //VirtualFree(lpbi,0,MEM_RELEASE); CloseHandle(fh); return TRUE;} 这是一个抓客户区图形并保存的代码,直接可以调试通过你试下......包含了你所要的功能//相关代码片段,将其置于View类中即可,楼主参考一下 BITMAPINFO bi;//信息头 void *pBits=NULL; CRect rect;//客户区窗口 GetClientRect(&rect); int nWidth=rect.right; int nHeight=rect.bottom; //填充信息头 ZeroMemory(&bi,sizeof(bi)); bi.bmiHeader.biSize=sizeof(bi.bmiHeader); bi.bmiHeader.biHeight=nHeight; bi.bmiHeader.biWidth=nWidth; bi.bmiHeader.biPlanes=1; bi.bmiHeader.biBitCount=24; bi.bmiHeader.biCompression=BI_RGB; bi.bmiHeader.biSizeImage=3*nWidth*nHeight; //拷贝客户区至内存DC //HDC hActiveDC=::GetDC(GetSafeHwnd());//参数 HDC hActiveDC=::GetDC(this->m_hWnd); HDC hActiveWndCompatibleDC=CreateCompatibleDC(hActiveDC); HBITMAP hActiveWndCompactibleBitmap=CreateCompatibleBitmap(hActiveDC,rect.right,rect.bottom); SelectObject(hActiveWndCompatibleDC,hActiveWndCompactibleBitmap); //把hActiveDC句柄所指定的当前客户区图复制到hActiveWndCompatibleDC中 BitBlt(hActiveWndCompatibleDC,0,0,rect.right,rect.bottom,hActiveDC,0,0,SRCCOPY); //保存内存DC HDC hBmpFileDC=CreateCompatibleDC(hActiveWndCompatibleDC); //创建一个位图可用作直接进行写操作 HBITMAP hBmpFileBitmap=CreateDIBSection(hActiveWndCompatibleDC,&bi,DIB_RGB_COLORS,&pBits,NULL,0); SelectObject(hBmpFileDC,hBmpFileBitmap); BitBlt(hBmpFileDC,0,0,nWidth,nHeight,hActiveWndCompatibleDC,0,0,SRCCOPY); CString tempFileName;//目标文件名 tempFileName = "D:\\MAP.bmp"; HANDLE hFile=CreateFile(tempFileName,GENERIC_WRITE,FILE_SHARE_WRITE,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL); if(hFile!=INVALID_HANDLE_VALUE) { DWORD dwRet=0; //填充文件头 BITMAPFILEHEADER bmfHeader; ZeroMemory(&bmfHeader,sizeof(bmfHeader)); bmfHeader.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER); bmfHeader.bfSize=bi.bmiHeader.biSizeImage+bmfHeader.bfOffBits; bmfHeader.bfType='MB'; WriteFile(hFile,&bmfHeader,sizeof(bmfHeader),&dwRet,NULL); WriteFile(hFile,&bi.bmiHeader,sizeof(bi.bmiHeader),&dwRet,NULL); WriteFile(hFile,pBits,bi.bmiHeader.biSizeImage,&dwRet,NULL); CloseHandle(hFile); } BITMAPFILEHEADER bmpfile; BITMAPINFOHEADER bmpinfo; //set bmpfile//////////////////////////// bmpfile.bfType = 0x4d42; //'BM' bmpfile.bfReserved1 = bmpfile.bfReserved2 = 0; bmpfile.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER); bmpfile.bfSize = bmpfile.bfOffBits;//+10000-14;//m_nSize; //set bmpinfo/////////////////////////////////// bmpinfo.biSize = sizeof(BITMAPINFOHEADER); bmpinfo.biWidth = 100; //m_nW; bmpinfo.biHeight = 100; //m_nH; bmpinfo.biPlanes = 1; bmpinfo.biBitCount = 24; bmpinfo.biCompression = BI_RGB; bmpinfo.biSizeImage = 0; bmpinfo.biXPelsPerMeter = 0; bmpinfo.biYPelsPerMeter = 0; bmpinfo.biClrUsed = 0; bmpinfo.biClrImportant = 0; CFile file("abc.bmp",CFile::modeCreate|CFile::modeWrite); file.Write(&bmpfile,sizeof(BITMAPFILEHEADER)); file.Write(&bmpinfo,sizeof(BITMAPINFOHEADER)); m_RGB = new RGBTRIPLE[100*100]; //比如大小10000 for(int i=0;i<10000;i++) { //你的buff的数据 } file.Write(m_RGB,30000); VC6 单文档方式下, 如何将一个对话框界面嵌入进去,而不是浮在界面上面. 请教rose建模到mfc 如何让两个settimer同时运行 返回地址的类型不匹配问题 如何一个sql语句实现在access添加一个ole的字段? 如何去掉CSing中的\n字符?? 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//SaveBitmapToFile 将图片存成文件
int SaveBitmapToFile(HBITMAP hBitmap, LPSTR lpFileName) { //lpFileName 为位图文件名
HDC hDC; //设备描述表
WORD wBitCount; //位图中每个像素所占字节数
//定义调色板大小, 位图中像素字节大小 , 位图文件大小 , 写入文件字节数
DWORD dwPaletteSize=0,dwBmBitsSize, dwWritten;
BITMAP Bitmap; //位图属性结构
BITMAPFILEHEADER bmfHdr; //位图文件头结构
BITMAPINFOHEADER bi; //位图信息头结构
LPBITMAPINFOHEADER lpbi; //指向位图信息头结构
HANDLE fh,hPal;
HPALETTE hOldPal=NULL;
//定义文件,分配内存句柄,调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
wBitCount = Bitmap.bmBitsPixel;
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize=(1<<wBitCount)*sizeof(RGBQUAD); bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存/*xxxxxxxx计算位图大小分解一下(解释一下上面的语句)xxxxxxxxxxxxxxxxxxxx
//每个扫描行所占的字节数应该为4的整数倍,具体算法为:
int biWidth = (Bitmap.bmWidth*wBitCount) / 32;
if((Bitmap.bmWidth*wBitCount) % 32)
biWidth++; //不是整数倍的加1
biWidth *= 4;//到这里,计算得到的为每个扫描行的字节数。
dwBmBitsSize = biWidth * Bitmap.bmHeight;//得到大小
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*///int iSize = dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER);
// hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
//HANDLE hHeap = HeapCreate(0,iSize,0);
lpbi =(LPBITMAPINFOHEADER) HeapAlloc(GetProcessHeap(),HEAP_GENERATE_EXCEPTIONS,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
//lpbi =(LPBITMAPINFOHEADER) VirtualAlloc(NULL,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER),MEM_RESERVE | MEM_COMMIT,PAGE_READWRITE);DWORD dwError = GetLastError();
DebugOut("LastError = %d",dwError);
// lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = GetDC(NULL);
hOldPal=SelectPalette(hDC,(HPALETTE)hPal,FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC,hBitmap,0,(UINT)Bitmap.bmHeight,(LPSTR)lpbi+sizeof(BITMAPINFOHEADER)+dwPaletteSize, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);//DIB_PAL_COLORS);//DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, hOldPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
}
//创建位图文件
fh=CreateFile(lpFileName, GENERIC_WRITE,0, NULL, CREATE_NEW,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh==INVALID_HANDLE_VALUE) return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
bmfHdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)+(DWORD)sizeof(BITMAPINFOHEADER)+dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize, &dwWritten, NULL);
//清除
//GlobalUnlock(hDib);
//GlobalFree(hDib);
HeapFree(GetProcessHeap(),0,lpbi);
// HeapDestroy(hHeap);
//VirtualFree(lpbi,0,MEM_RELEASE);
CloseHandle(fh);
return TRUE;
}
包含了你所要的功能
//相关代码片段,将其置于View类中即可,楼主参考一下 BITMAPINFO bi;//信息头
void *pBits=NULL;
CRect rect;//客户区窗口
GetClientRect(&rect);
int nWidth=rect.right;
int nHeight=rect.bottom;
//填充信息头
ZeroMemory(&bi,sizeof(bi));
bi.bmiHeader.biSize=sizeof(bi.bmiHeader);
bi.bmiHeader.biHeight=nHeight;
bi.bmiHeader.biWidth=nWidth;
bi.bmiHeader.biPlanes=1;
bi.bmiHeader.biBitCount=24;
bi.bmiHeader.biCompression=BI_RGB;
bi.bmiHeader.biSizeImage=3*nWidth*nHeight;
//拷贝客户区至内存DC
//HDC hActiveDC=::GetDC(GetSafeHwnd());//参数
HDC hActiveDC=::GetDC(this->m_hWnd);
HDC hActiveWndCompatibleDC=CreateCompatibleDC(hActiveDC);
HBITMAP hActiveWndCompactibleBitmap=CreateCompatibleBitmap(hActiveDC,rect.right,rect.bottom);
SelectObject(hActiveWndCompatibleDC,hActiveWndCompactibleBitmap);
//把hActiveDC句柄所指定的当前客户区图复制到hActiveWndCompatibleDC中
BitBlt(hActiveWndCompatibleDC,0,0,rect.right,rect.bottom,hActiveDC,0,0,SRCCOPY);
//保存内存DC
HDC hBmpFileDC=CreateCompatibleDC(hActiveWndCompatibleDC);
//创建一个位图可用作直接进行写操作
HBITMAP hBmpFileBitmap=CreateDIBSection(hActiveWndCompatibleDC,&bi,DIB_RGB_COLORS,&pBits,NULL,0);
SelectObject(hBmpFileDC,hBmpFileBitmap);
BitBlt(hBmpFileDC,0,0,nWidth,nHeight,hActiveWndCompatibleDC,0,0,SRCCOPY); CString tempFileName;//目标文件名
tempFileName = "D:\\MAP.bmp";
HANDLE hFile=CreateFile(tempFileName,GENERIC_WRITE,FILE_SHARE_WRITE,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
if(hFile!=INVALID_HANDLE_VALUE)
{
DWORD dwRet=0;
//填充文件头
BITMAPFILEHEADER bmfHeader;
ZeroMemory(&bmfHeader,sizeof(bmfHeader));
bmfHeader.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
bmfHeader.bfSize=bi.bmiHeader.biSizeImage+bmfHeader.bfOffBits;
bmfHeader.bfType='MB';
WriteFile(hFile,&bmfHeader,sizeof(bmfHeader),&dwRet,NULL);
WriteFile(hFile,&bi.bmiHeader,sizeof(bi.bmiHeader),&dwRet,NULL);
WriteFile(hFile,pBits,bi.bmiHeader.biSizeImage,&dwRet,NULL);
CloseHandle(hFile);
}
BITMAPINFOHEADER bmpinfo;
//set bmpfile////////////////////////////
bmpfile.bfType = 0x4d42; //'BM'
bmpfile.bfReserved1 = bmpfile.bfReserved2 = 0;
bmpfile.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
bmpfile.bfSize = bmpfile.bfOffBits;//+10000-14;//m_nSize;
//set bmpinfo///////////////////////////////////
bmpinfo.biSize = sizeof(BITMAPINFOHEADER);
bmpinfo.biWidth = 100; //m_nW;
bmpinfo.biHeight = 100; //m_nH;
bmpinfo.biPlanes = 1;
bmpinfo.biBitCount = 24;
bmpinfo.biCompression = BI_RGB;
bmpinfo.biSizeImage = 0;
bmpinfo.biXPelsPerMeter = 0;
bmpinfo.biYPelsPerMeter = 0;
bmpinfo.biClrUsed = 0;
bmpinfo.biClrImportant = 0;
CFile file("abc.bmp",CFile::modeCreate|CFile::modeWrite);
file.Write(&bmpfile,sizeof(BITMAPFILEHEADER));
file.Write(&bmpinfo,sizeof(BITMAPINFOHEADER));
m_RGB = new RGBTRIPLE[100*100]; //比如大小10000
for(int i=0;i<10000;i++)
{
//你的buff的数据
}
file.Write(m_RGB,30000);