vc实现文件的打印－－BOOL Print_html(const char *sURL)

网上找的源码，用VC实现文件的打印，但是有点bug，添加了注释，如果有人能解决这几个bug，请告诉我一声。代码如下：

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/*

    功能：打印任何浏览器能打开的本地文件，并实现打印功能

    @sURL: 要打印的文件路径(只能打开本地文件)

    bug: 测试了下，如果网页有脚本错误或被浏览器拦截了插件，则打印出来的内容可能为空，不知道有什么好的解决办法吗？

         另外，对于网页上的页面无效果(不会打印出文件来)

*/

BOOL Print_html(const char *sURL)

{

    HRESULT hr;

    CLSID clsid; 

    IUnknown     *pUnknown = NULL; 

    IWebBrowser2 *pWebBrowser2 = NULL; 

    IOleCommandTarget* pCommandTarget = NULL; 

    IDispatch *pDispatch = NULL;

    VARIANT va; 

    OLECHAR sOleChar[MAX_PATH]; 

    CoInitialize(NULL); 

    CLSIDFromProgID(L"InternetExplorer.Application", &clsid); 

    hr = CoCreateInstance(clsid, NULL, CLSCTX_ALL, IID_IUnknown, (void  **)&pUnknown);

    if (SUCCEEDED(hr)) 

    {

        hr = pUnknown->QueryInterface(IID_IWebBrowser2, (void **)&pWebBrowser2);

        if (SUCCEEDED(hr))

        { 

            VariantInit(&va); 

            va.vt = VT_I4; 

            va.lVal = 0; 

            MultiByteToWideChar(CP_ACP, 0, sURL, -1, sOleChar, sizeof sOleChar); 

            BSTR bstrURL = SysAllocString(sOleChar); 

            hr = pWebBrowser2->Navigate(bstrURL, &va, &va, &va, &va);

            SysFreeString (bstrURL);

            hr = pWebBrowser2->get_Document(&pDispatch);

            if (SUCCEEDED(hr)) 

            { 

                hr =  pDispatch->QueryInterface(IID_IOleCommandTarget,(void**)&pCommandTarget); 

                if (SUCCEEDED(hr)) 

                { 

                    hr = pCommandTarget->Exec(NULL, OLECMDID_PRINT, OLECMDEXECOPT_DONTPROMPTUSER, NULL, NULL);

                    Sleep(2000);

                    pCommandTarget->Release();

                } 

                else 

                { 

                    pDispatch->Release();

                    pWebBrowser2->Release();

                    pUnknown->Release(); 

                    CoUninitialize(); 

                    return FALSE;

                } 

                pDispatch->Release(); 

            } 

            else

            { 

                pWebBrowser2->Release(); 

                pUnknown->Release(); 

                CoUninitialize(); 

                return FALSE;

            } 

            pWebBrowser2->Release(); 

        }

        else

        {

            pUnknown->Release(); 

            CoUninitialize(); 

            return FALSE;

        } 

        pUnknown->Release(); 

    } 

    else

    {

        CoUninitialize(); 

        return FALSE;

    }

    CoUninitialize(); 

    return TRUE;

}

 

//是否打印页眉、页脚

//i_sign: 0-打印

//    1-不打印

BOOL Print_header_footer(int i_sign)

{

    const int KEY_LEN = 100;

    char lp_header[KEY_LEN];

    char lp_footer[KEY_LEN];

    char *str_keyname = "Software\\Microsoft\\Internet Explorer\\PageSetup\\";

    HKEY hKey;

    int err;

    if(RegOpenKeyEx(HKEY_CURRENT_USER,str_keyname,0,KEY_WRITE,&hKey) != ERROR_SUCCESS)

    {

        err = GetLastError();

        return FALSE;

    }

    if(i_sign == 0)

    {

        memset(lp_header,0,sizeof(lp_header));

        memset(lp_footer,0,sizeof(lp_footer));

        strcpy(lp_header,"&w&b页码，&p/&P"); //"&w&b页码，&p/&P";

        strcpy(lp_footer,"&u&b&d");    //"&u&b&d";

         

        if(RegSetValueEx(hKey, "header", 0, REG_SZ, (const unsigned char *)lp_header, strlen(lp_header))!=ERROR_SUCCESS)

        {

            RegCloseKey(hKey);

            return FALSE;

        }

        if(RegSetValueEx(hKey, "footer", 0, REG_SZ, (const unsigned char *)lp_footer, strlen(lp_footer))!=ERROR_SUCCESS)

        {

            RegCloseKey(hKey);

            return FALSE;

        }

        RegCloseKey(hKey);

        return TRUE;

    }

    if(i_sign == 1)

    {

        memset(lp_header,0,sizeof(lp_header));

        memset(lp_footer,0,sizeof(lp_footer));

         

        if(RegSetValueEx(hKey, "header", 0, REG_SZ, (const unsigned char *)lp_header, strlen(lp_header))!=ERROR_SUCCESS)

        {

            RegCloseKey(hKey);

            return FALSE;

        }

        if(RegSetValueEx(hKey, "footer", 0, REG_SZ, (const unsigned char *)lp_footer, strlen(lp_footer))!=ERROR_SUCCESS)

        {

            RegCloseKey(hKey);

            return FALSE;

        }

        RegCloseKey(hKey);

        return TRUE;

    }

     

    return TRUE;

}

 

经测试，Print_Html只对本地文件有效，对于输入的网址，不会产生任何打印文件。而且本地的文件不能有脚本错误，要不然，有可能打印出来的文件内容为空。

这个代码的原理是利用流利器打开一个文件，再利用浏览器菜单中的打印功能来实现文件打印的。所以如果你不是用微软默认的Internet Explorer.exe的话，可能无法实现文件打印，因此必须将IE浏览器设置为默认的浏览器才可以噢！