在用vc做程序时候，经常需要把输出的文本和图形保存到位图文件，当然可以有现成的控件来实现,但总不能如自己所愿，还是自己动手写吧！如下图：

一、实现方法

要把文本和图形保存到位图文件，只要对掌握位图结构有一定的了解，一切都ok呢。先必须要创建内存设备环境，然后内存设备环境创建的DIB区域，别忘了还 要创建个CBitmap对象，CBitmap对象必须和DIB区域关联起来，把CBitmap对象选择到当前设备环境，然后在当前设备环境输出文本和图形 就可以了。

二、具体实现代码如下

void CTestSaveBmpView::SaveAsBmp(CString filename)
{
    //定义图形大小
    int iWidth = 800;

    int iHeight = 600;

    int iPixel = 16;

    //图形格式参数

    LPBITMAPINFO lpbmih = new BITMAPINFO;

    lpbmih->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

    lpbmih->bmiHeader.biWidth = iWidth;

    lpbmih->bmiHeader.biHeight = iHeight;

    lpbmih->bmiHeader.biPlanes = 1;

    lpbmih->bmiHeader.biBitCount = iPixel;

    lpbmih->bmiHeader.biCompression = BI_RGB;

    lpbmih->bmiHeader.biSizeImage = 0;

    lpbmih->bmiHeader.biXPelsPerMeter = 0;

    lpbmih->bmiHeader.biYPelsPerMeter = 0;

    lpbmih->bmiHeader.biClrUsed = 0;

    lpbmih->bmiHeader.biClrImportant = 0;

    //创建位图数据

    HDC hdc,hdcMem;

    HBITMAP hBitMap = NULL;

    CBitmap *pBitMap = NULL;

    CDC *pMemDC = NULL;

    BYTE *pBits;

    hdc = CreateIC(TEXT("DISPLAY"),NULL,NULL,NULL);

    hdcMem = CreateCompatibleDC(hdc);

    hBitMap = CreateDIBSection(hdcMem,lpbmih,DIB_PAL_COLORS,(void **)&pBits,NULL,0);

    pBitMap = new CBitmap;

    pBitMap->Attach(hBitMap);

    pMemDC = new CDC;

    pMemDC->Attach(hdcMem);

    pMemDC->SelectObject(pBitMap);
    //

    CRect rc(0,0,iWidth,iHeight);

    pMemDC->SetBkMode(TRANSPARENT);

    //添加自绘图形

    DrawCurve(pMemDC,rc);

    //保存到文件并创建位图结构

    BITMAPFILEHEADER bmfh;

    ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));

    *((char *)&bmfh.bfType) = ''B'';

    *(((char *)&bmfh.bfType)   1) = ''M'';

    bmfh.bfOffBits = sizeof(BITMAPFILEHEADER)   sizeof(BITMAPINFOHEADER);

    bmfh.bfSize = bmfh.bfOffBits   (iWidth * iHeight) * iPixel / 8;

    $nextPage$

        TCHAR szBMPFileName[128];

    int iBMPBytes = iWidth * iHeight * iPixel / 8;

    strcpy(szBMPFileName,filename);

    CFile file;

    if(file.Open(szBMPFileName,CFile::modeWrite | CFile::modeCreate))
    {
        file.Write(&bmfh,sizeof(BITMAPFILEHEADER));

        file.Write(&(lpbmih->bmiHeader),sizeof(BITMAPINFOHEADER));

        file.Write(pBits,iBMPBytes);

        file.Close();
    }
    pMemDC->DeleteDC();

    delete pMemDC; pMemDC = NULL;

    delete pBitMap; pBitMap = NULL;

    delete lpbmih; lpbmih = NULL;

}