请教打印流程

startdocw->startpage->startpageprinter.........endpageprinter->endpage->enddoc,一般流程是这样吧，请在startpageprinter和endpageprinter之间，一般会调用什么函数。谢谢

    // Zero and then initialize the members of a DOCINFO structure.
 
    memset( &di, 0, sizeof(DOCINFO) );
    di.cbSize = sizeof(DOCINFO);
    di.lpszDocName = (LPCTSTR)TEXT("Bitmap Printing Test");
    di.lpszOutput = (LPTSTR) NULL;
    di.lpszDatatype = (LPTSTR) NULL;
    di.fwType = 0;
 
    // Begin a print job by calling the StartDoc function.
 
    nError = StartDoc(pd.hDC, &di);
    if (nError == SP_ERROR)
    {
        errhandler((LPCTSTR)TEXT("StartDoc"), hWnd);
        goto Error;
    }
 
    // Inform the driver that the application is about to begin
    // sending data.
 
    nError = StartPage(pd.hDC);
    if (nError <= 0)
    {
        errhandler((LPCTSTR)TEXT("StartPage"), hWnd);
        goto Error;
    }
 
    // Retrieve the number of pixels-per-logical-inch in the
    // horizontal and vertical directions for the display upon which
    // the bitmap was created. These are likely the same as for
    // the present display, so we use those values here.
 
    hWinDC = GetDC(hWnd);
    fLogPelsX1 = (float) GetDeviceCaps(hWinDC, LOGPIXELSX);
    fLogPelsY1 = (float) GetDeviceCaps(hWinDC, LOGPIXELSY);
 
    // Retrieve the number of pixels-per-logical-inch in the
    // horizontal and vertical directions for the printer upon which
    // the bitmap will be printed.
 
    fLogPelsX2 = (float) GetDeviceCaps(pd.hDC, LOGPIXELSX);
    fLogPelsY2 = (float) GetDeviceCaps(pd.hDC, LOGPIXELSY);
 
    // Determine the scaling factors required to print the bitmap and
    // retain its original proportions.
 
    if (fLogPelsX1 > fLogPelsX2)
        fScaleX = (fLogPelsX1 / fLogPelsX2);
    else fScaleX = (fLogPelsX2 / fLogPelsX1);
 
    if (fLogPelsY1 > fLogPelsY2)
        fScaleY = (fLogPelsY1 / fLogPelsY2);
    else fScaleY = (fLogPelsY2 / fLogPelsY1);
 
    // Compute the coordinates of the upper left corner of the
    // centered bitmap.
 
    cWidthPels = GetDeviceCaps(pd.hDC, HORZRES);
    xLeft = ((cWidthPels / 2) - ((int) (((float) bmih.biWidth)
            * fScaleX)) / 2);
    cHeightPels = GetDeviceCaps(pd.hDC, VERTRES);
    yTop = ((cHeightPels / 2) - ((int) (((float) bmih.biHeight)
            * fScaleY)) / 2);
 
    // Use StretchDIBits to scale the bitmap and maintain
    // its original proportions (that is, if the bitmap was square
    // when it appeared in the application's client area, it should
    // also appear square on the page).
 
    if (StretchDIBits(pd.hDC, xLeft, yTop, (int) ((float) bmih.biWidth
        * fScaleX), (int) ((float) bmih.biHeight * fScaleY), 0, 0,
        bmih.biWidth, bmih.biHeight, lpBits, lpBitsInfo, iUsage,
        SRCCOPY) == GDI_ERROR)
    {
        errhandler((LPCTSTR)TEXT("StretchDIBits Failed"), hWnd);
    }
 
 
    // Retrieve the width of the string that specifies the full path
    // and filename for the file that contains the bitmap.
 
    GetTextExtentPoint32W(pd.hDC, ofn.lpstrFile,
        ofn.nFileExtension + 3, &szMetric);
 
    // Compute the starting point for the text-output operation. The
    // string will be centered horizontally and positioned three lines
    // down from the top of the page.
 
    xLeft = ((cWidthPels / 2) - (szMetric.cx / 2));
    yTop = (szMetric.cy * 3);
 
    // Print the path and filename for the bitmap, centered at the top
    // of the page.
 
    TextOut(pd.hDC, xLeft, yTop, ofn.lpstrFile,
        ofn.nFileExtension + 3);
 
    // Determine whether the user has pressed the Cancel button in the
    // AbortPrintJob dialog box; if the button has been pressed, call
    // the AbortDoc function. Otherwise, inform the spooler that the
    // page is complete.
 
    nError = EndPage(pd.hDC);
 
    if (nError <= 0)
    {
        errhandler((LPCTSTR)TEXT("EndPage"), hWnd);
        goto Error;
    }
 
    // Inform the driver that document has ended.
 
    nError = EndDoc(pd.hDC);
    if (nError <= 0)
        errhandler((LPCTSTR)TEXT("EndDoc"), hWnd);
 
Error:
    // Enable the application's window.
 
    EnableWindow(hWnd, TRUE);
 
    // Remove the AbortPrintJob dialog box.
 
    DestroyWindow(hdlgCancel);
 
    // Delete the printer DC.
 
    DeleteDC(pd.hDC);

主要就是GDI的绘制函数，MSDN有打印作业的例子的，上面就是。