qq_38482920
佳幂小煜
采纳率33.3%
2018-07-23 09:50 阅读 2.3k

bitmap的打印机打印问题

5

我现在的思路是用loadimage读取一个bmp文件,然后用stretchblt的函数把图片复制到打印机的句柄上,现在的问题是我本地的图片是一个纵向的图片,但是打印机打出来的是个横向的图片

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  • caozhy 从今以后生命中的每一秒都属于我爱的人 2018-07-23 10:37
     // Q695292.cpp : Defines the entry point for the console application.
    //
    
    #include "stdafx.h"
    
    #include "windows.h"
    #include "resource.h"
    
    HBITMAP CaptureImage(HWND hwnd)
    {
        HANDLE hDIB;
        DWORD dwBmpSize;
        HBITMAP hbmScreen = NULL;
        BITMAP bmpScreen;
        BITMAPINFOHEADER bi;
        CHAR *lpbitmap;
        INT width = GetSystemMetrics(SM_CXSCREEN);  // ÆÁÄ»¿í
        INT height = GetSystemMetrics(SM_CYSCREEN);  // ÆÁÄ»¸ß
        HDC hdcScreen = GetDC(NULL); // È«ÆÁÄ»DC
        HDC hdcMemDC = CreateCompatibleDC(hdcScreen); // ´´½¨¼æÈÝÄÚ´æDC
    
        if (!hdcMemDC)
        {
            //echo(TEXT("CreateCompatibleDC has failed"));
            goto done;
        }
    
        // ͨ¹ý´°¿ÚDC ´´½¨Ò»¸ö¼æÈÝλͼ
        hbmScreen = CreateCompatibleBitmap(hdcScreen, width, height);
    
        if (!hbmScreen)
        {
            //echo(TEXT("CreateCompatibleBitmap Failed"));
            goto done;
        }
    
        // ½«Î»Í¼¿é´«Ë͵½ÎÒÃǼæÈݵÄÄÚ´æDCÖÐ
        SelectObject(hdcMemDC, hbmScreen);
        if (!BitBlt(
                    hdcMemDC,    // Ä¿µÄDC
                    0, 0,        // Ä¿µÄDCµÄ x,y ×ø±ê
                    width, height, // Ä¿µÄ DC µÄ¿í¸ß
                    hdcScreen,   // À´Ô´DC
                    0, 0,        // À´Ô´DCµÄ x,y ×ø±ê
                    SRCCOPY))    // Õ³Ìù·½Ê½
        {
            //echo(TEXT("BitBlt has failed"));
            goto done;
        }
    
        // »ñȡλͼÐÅÏ¢²¢´æ·ÅÔÚ bmpScreen ÖÐ
        GetObject(hbmScreen, sizeof(BITMAP), &bmpScreen);
    
        bi.biSize = sizeof(BITMAPINFOHEADER);
        bi.biWidth = bmpScreen.bmWidth;
        bi.biHeight = bmpScreen.bmHeight;
        bi.biPlanes = 1;
        bi.biBitCount = 32;
        bi.biCompression = BI_RGB;
        bi.biSizeImage = 0;
        bi.biXPelsPerMeter = 0;
        bi.biYPelsPerMeter = 0;
        bi.biClrUsed = 0;
        bi.biClrImportant = 0;
    
        dwBmpSize = ((bmpScreen.bmWidth * bi.biBitCount + 31) / 32) * 4 * bmpScreen.bmHeight;
    
        // ÔÚ 32-bit Windows ϵͳÉÏ, GlobalAlloc ºÍ LocalAlloc ÊÇÓÉ HeapAlloc ·â×°À´µÄ
        // handle Ö¸Ïò½ø³ÌĬÈϵĶÑ. ËùÒÔ¿ªÏú±È HeapAlloc Òª´ó
        hDIB = GlobalAlloc(GHND, dwBmpSize);
        lpbitmap = (char *)GlobalLock(hDIB);
    
        // »ñÈ¡¼æÈÝλͼµÄλ²¢ÇÒ¿½±´½á¹ûµ½Ò»¸ö lpbitmap ÖÐ.
        GetDIBits(
            hdcScreen,  // É豸»·¾³¾ä±ú
            hbmScreen,  // λͼ¾ä±ú
            0,          // Ö¸¶¨¼ìË÷µÄµÚÒ»¸öɨÃèÏß
            (UINT)bmpScreen.bmHeight, // Ö¸¶¨¼ìË÷µÄɨÃèÏßÊý
            lpbitmap,   // Ö¸ÏòÓÃÀ´¼ìË÷λͼÊý¾ÝµÄ»º³åÇøµÄÖ¸Õë
            (BITMAPINFO *)&bi, // ¸Ã½á¹¹Ìå±£´æλͼµÄÊý¾Ý¸ñʽ
            DIB_RGB_COLORS // ÑÕÉ«±íÓɺ졢ÂÌ¡¢À¶£¨RGB£©Èý¸öÖ±½ÓÖµ¹¹³É
        );
    
        // ½âËø¶ÑÄÚ´æ²¢ÊÍ·Å
        GlobalUnlock(hDIB);
        GlobalFree(hDIB);
    
        // ÇåÀí×ÊÔ´
    done:
        //DeleteObject(hbmScreen);
        DeleteObject(hdcMemDC);
        ReleaseDC(NULL, hdcScreen);
    
        return hbmScreen;
    }
    
    LPDEVMODE GetLandscapeDevMode(HWND hWnd, LPWSTR pDevice)
       {
    
       HANDLE      hPrinter;
       LPDEVMODE   pDevMode;
       DWORD       dwNeeded, dwRet;
    
       /* Start by opening the printer */ 
       if (!OpenPrinter(pDevice, &hPrinter, NULL))
           return NULL;
    
       /*
        * Step 1:
        * Allocate a buffer of the correct size.
        */ 
       dwNeeded = DocumentProperties(hWnd,
           hPrinter,       /* Handle to our printer. */ 
           pDevice,        /* Name of the printer. */ 
           NULL,           /* Asking for size, so */ 
           NULL,           /* these are not used. */ 
           0);             /* Zero returns buffer size. */ 
       pDevMode = (LPDEVMODE)malloc(dwNeeded);
    
       /*
        * Step 2:
        * Get the default DevMode for the printer and
        * modify it for your needs.
        */ 
       dwRet = DocumentProperties(hWnd,
           hPrinter,
           pDevice,
           pDevMode,       /* The address of the buffer to fill. */ 
           NULL,           /* Not using the input buffer. */ 
           DM_OUT_BUFFER); /* Have the output buffer filled. */ 
       if (dwRet != IDOK)
       {
           /* If failure, cleanup and return failure. */ 
           free(pDevMode);
           ClosePrinter(hPrinter);
           return NULL;
       }
    
       /*
            * Make changes to the DevMode which are supported.
        */ 
       if (pDevMode->dmFields & DM_ORIENTATION)
       {
           /* If the printer supports paper orientation, set it.*/ 
           pDevMode->dmOrientation = DMORIENT_LANDSCAPE;
       }
    
       if (pDevMode->dmFields & DM_DUPLEX)
        {
           /* If it supports duplex printing, use it. */ 
           pDevMode->dmDuplex = DMDUP_HORIZONTAL;
       }
    
       /*
        * Step 3:
        * Merge the new settings with the old.
        * This gives the driver an opportunity to update any private
        * portions of the DevMode structure.
        */ 
        dwRet = DocumentProperties(hWnd,
           hPrinter,
           pDevice,
           pDevMode,       /* Reuse our buffer for output. */ 
           pDevMode,       /* Pass the driver our changes. */ 
           DM_IN_BUFFER |  /* Commands to Merge our changes and */ 
           DM_OUT_BUFFER); /* write the result. */ 
    
       /* Finished with the printer */ 
       ClosePrinter(hPrinter);
    
       if (dwRet != IDOK)
       {
           /* If failure, cleanup and return failure. */ 
           free(pDevMode);
           return NULL;
       }
    
       /* Return the modified DevMode structure. */ 
       return pDevMode;
    
       }
    
    
    int _tmain(int argc, _TCHAR* argv[])
    {
        TCHAR   szDriver[16] = _T("WINSPOOL");
        TCHAR   szPrinter[256];
        DWORD   cchBuffer = 255;
        HDC     hdcPrint = NULL;
        HANDLE  hPrinter = NULL;
        PRINTER_INFO_2  *pPrinterData;
        BYTE    pdBuffer[16384];
        BOOL    bReturn = FALSE;
    
        DWORD   cbBuf = sizeof (pdBuffer);
        DWORD   cbNeeded = 0;
        pPrinterData = (PRINTER_INFO_2 *)&pdBuffer[0];
    
        // get the default printer name
        bReturn = GetDefaultPrinter(
            szPrinter,
            &cchBuffer);
    
        if (bReturn) {
            // open the default printer
            bReturn = OpenPrinter(
                szPrinter,
                &hPrinter,
                NULL);
        }
    
        if (bReturn) {
            // get the printer port name
            bReturn =  GetPrinter(
                hPrinter,
                2,
                &pdBuffer[0],
                cbBuf,
                &cbNeeded);
    
               // this handle is no longer needed
            ClosePrinter(hPrinter);
        }
    
        if (bReturn) {
           // create the Print DC
    
            DEVMODE * devmode = GetLandscapeDevMode(0, szPrinter);
            devmode->dmOrientation = 2;
           hdcPrint = CreateDC(szDriver, szPrinter, 
                pPrinterData->pPortName, devmode); 
        }
    
        if (hdcPrint) {
    
            Escape(hdcPrint, STARTDOC, 8, "Test-Doc", NULL); 
    
            HBITMAP hBitmap = CaptureImage(GetDesktopWindow()); //LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_BITMAP1));
    
            HDC hMemDC = CreateCompatibleDC(hdcPrint);
            SelectObject(hMemDC, hBitmap);
            //BitBlt(hdcPrint, 0, 0, 3650 * 15, 2710 * 15, hMemDC, 0, 0, SRCCOPY);
            StretchBlt(hdcPrint, 300, 400, 1680 * 15 / 4, 1050 * 15 / 4, hMemDC, 0, 0, 1680, 1050, SRCCOPY);
    
            DeleteDC(hMemDC);
            DeleteObject(hBitmap);
    
            Escape(hdcPrint, NEWFRAME, 0, NULL, NULL); 
            Escape(hdcPrint, ENDDOC, 0, NULL, NULL); 
    
            // Delete the printer DC.  
            DeleteDC(hdcPrint); 
        }
    }
    
    
    
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  • caozhy 从今以后生命中的每一秒都属于我爱的人 2018-07-23 10:37

    图片说明

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