把内存里的hbitmap 保存为BMP图片 再加个用时间来获取文件名的

做了两天也没做出来,只好用别人的代码代替,,

下面两个函数的功能,读BMP,JPG,GIF,图片到内存并保存为BMP文件。。。

bool CDProductManager::LoadPictures(CString mFile,CString path)
{
CString pFSize,ext;
WCHAR wpath[MAX_PATH];
MultiByteToWideChar(CP_ACP, 0, mFile, -1, wpath, MAX_PATH);
IPicture* pPic;
CFile file;
CFileStatus fstatus;
IStream *pStm;
LONG cb;
OleLoadPicturePath(wpath, NULL, NULL, NULL, IID_IPicture,(LPVOID*)&pPic);
if (pPic==NULL) return NULL;
HBITMAP hPic = NULL;
pPic->get_Handle((UINT*)&hPic);
long nWidth=0;
long nHeight=0;
nWidth=160;
nHeight=120;
long mWid,mHei;
pPic->get_Height(&mHei);
pPic->get_Width(&mWid);

HDC   hdc=::GetDC(NULL);

mWid =   MulDiv(mWid,   GetDeviceCaps(hdc,   LOGPIXELSX),   HIMETRIC_INCH);
mHei =   MulDiv(mHei,   GetDeviceCaps(hdc,   LOGPIXELSY),   HIMETRIC_INCH);
//Relest   DC
::ReleaseDC(NULL,hdc);

int XDest, YDest, nDestWidth, nDestHeight;
// Calculate Rect to fit to canvas
const float fImgRatio=(float)mHei/mWid;
if(fImgRatio >= 0.75)
{
mWid = nDestWidth=(nHeight/fImgRatio);
mHei = nDestHeight=nHeight;
}
else
{
mWid = nDestWidth=nWidth;
mHei = nDestHeight=(nWidth*fImgRatio);
}
CString str;

HBITMAP hPicRet = (HBITMAP)CopyImage(hPic, IMAGE_BITMAP, nDestWidth, nDestHeight , LR_COPYDELETEORG);
if(!SaveTOBmp(hPicRet,path))
return false;
return true;
// Release used DC and Object
}
bool CDProductManager::SaveTOBmp(HBITMAP hBitmap, CString FileName)
{
HDC hDC;
//当前分辨率下每象素所占字节数
int iBits;
//位图中每象素所占字节数
WORD wBitCount;
//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=0, dwDIBSize=0, dwWritten=0;
//位图属性结构
BITMAP Bitmap;
//位图文件头结构
BITMAPFILEHEADER bmfHdr;
//位图信息头结构
BITMAPINFOHEADER bi;
//指向位图信息头结构
LPBITMAPINFOHEADER lpbi;
//定义文件,分配内存句柄,调色板句柄
HANDLE fh, hDib, hPal,hOldPal=NULL;

//计算位图文件每个像素所占字节数
hDC = CreateDC(“DISPLAY”, NULL, NULL, NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1) wBitCount = 1;
else if (iBits <= 4) wBitCount = 4;
else if (iBits <= 8) wBitCount = 8;
else      wBitCount = 24;

GetObject(hBitmap, sizeof(Bitmap), (LPSTR)&Bitmap);
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.biClrImportant = 0;
bi.biClrUsed = 0;

dwBmBitsSize = ((Bitmap.bmWidth * wBitCount + 31) / 32) * 4 * Bitmap.bmHeight;

//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize + dwPaletteSize + sizeof(BITMAPINFOHEADER));
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);

//恢复调色板
if (hOldPal)
{
::SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(FileName, GENERIC_WRITE,0, NULL, CREATE_ALWAYS,
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”
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
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, dwDIBSize, &dwWritten, NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}

再加个用时间来获取文件名的

void CDProductManager::GetFileNames(char *name)
{
struct tm *ptr;
long t;
t=time(NULL);
ptr=localtime(&t);
strftime(name,16,”%Y%m%d%H%M%S”,ptr);
}

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