打开CFileDialog

Question

不调用 CFileDialog ，阅读注册表似乎有效。

但是在调用 CFileDialog 之后（即使在没有调用任何文件的情况下打开和关闭之后），从注册表中读取也会失败。

以下是 CFileDialog 代码：

void CprojectTHD_2015_09_28Doc::OnImportFromTextfile()
{
    if(!SaveFile()) return;

    TCHAR szFilter[] = _T("INP Files (*.INP)|*.inp|OUT Files (*.OUT)|*.out||");
    CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY | OFN_FILEMUSTEXIST, szFilter);

    CString strPathName;  
    if(IDOK == dlg.DoModal()){
        strPathName = dlg.GetPathName();

        AdPinData *pInputDataTem = new AdPinData();     //to open new input data

        if(pInputDataTem->OpenFile(strPathName)){       //to get Infos from text file
        //to delete the last file Data when it needs a new file
            if(pInputData){ delete pInputData; pInputData=NULL; }
            if(pOutputData){ delete pOutputData; pOutputData=NULL; }
            if(pBusData){ delete pBusData; pBusData=NULL; }

            pInputData = pInputDataTem;
            pInputDataTem = NULL;

            //to open new output data
            pOutputData = new AdPinData();
            pOutputData->initAdPinData(false);  //to just initialize, it doesn't need text file

            //to open new bus data
            pBusData = new AdBusData();
            pBusData->initAdBusData();

            for(int i=1;i<6;i++) MyEnableMenu(true, i); //on all the menu above

            endofTick = 0;                  //set basic value 0
            SignalView::isOverwritten = false;

            UpdateAllViews(NULL);           //to execute Ondraw funcion agian
        }else{
            delete pInputDataTem; pInputDataTem=NULL;
            if(!pInputData) AdPinData::setFlag(false);
        }
    }
}

而且，这是从注册表中读取的代码：

CString CSerialPort::GetPortName()
{
    DWORD dwcSubKeys, dwcValues, dwcMaxSubKeyName, dwcMaxValueName, dwcMaxValueData;
    TCHAR szBuffer[255] = {0};
    DWORD dwSubKeyIndex = 0;
    DWORD dwValueIndex = 0;
    HKEY hKey = 0;
    LONG lStatus = ERROR_SUCCESS;

    TCHAR szValueName[255] = {0};
    TCHAR szValueData[255] = {0};

    lStatus = RegOpenKeyEx(HKEY_LOCAL_MACHINE,TEXT("HARDWARE\\DEVICEMAP\\SERIALCOMM"),0,KEY_READ/*KEY_ALL_ACCESS*/,&hKey);

    if (lStatus == ERROR_SUCCESS) {
        RegQueryInfoKey(hKey, szBuffer, NULL, 0,
            &dwcSubKeys, &dwcMaxSubKeyName, NULL,
            &dwcValues, &dwcMaxValueName, &dwcMaxValueData,
             NULL, NULL);

        if (dwcValues != 0) {
            do {
                DWORD dwType;   
                DWORD dwcValueName = sizeof(szValueName);
                DWORD dwcValueData = sizeof(szValueData);
                lStatus = RegEnumValue(hKey, dwValueIndex,
                        szValueName, &dwcValueName,
                        NULL, &dwType,
                        (BYTE*)szValueData,
                        &dwcValueData);
                dwValueIndex++;
            } while (lStatus == ERROR_SUCCESS);
        }
        RegCloseKey(hKey);
    }
    return szValueData;
}

P.S。 我将代码更改为：

CString CSerialPort::GetPortName()
{
    DWORD dwcSubKeys,dwcValues,dwcMaxSubKeyName,dwcMaxValueName,dwcMaxValueData;
    dwcSubKeys=dwcValues=dwcMaxSubKeyName=dwcMaxValueName=dwcMaxValueData=0; ///
    DWORD dwSubKeyIndex = 0;
    DWORD dwValueIndex = 0;
    HKEY hKey = 0;
    LONG lStatus = ERROR_SUCCESS;

    TCHAR szValueName[255] = {0};
    TCHAR szValueData[255] = {0};

    lStatus = RegOpenKeyEx(HKEY_LOCAL_MACHINE,/*TEXT*/_T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),0,KEY_READ,&hKey);

    if (lStatus == ERROR_SUCCESS) {
        RegQueryInfoKey(hKey, NULL/*szBuffer*/, NULL, 0,
            &dwcSubKeys, &dwcMaxSubKeyName, NULL,
            &dwcValues, &dwcMaxValueName, &dwcMaxValueData,
             NULL, NULL);

        if (dwcValues != 0) {
            do {
                DWORD dwcValueName = sizeof(szValueName);
                DWORD dwcValueData = sizeof(szValueData);
                lStatus = RegEnumValue(hKey, dwValueIndex,
                        szValueName, &dwcValueName,
                        NULL, NULL, ///
                        (BYTE*)szValueData,
                        &dwcValueData);
                dwValueIndex++;
            } while (lStatus == ERROR_SUCCESS);
        }
        RegCloseKey(hKey);
    }
    return szValueData;
}

我不使用我不需要的值，似乎比以前更好。至少它在任何情况下都有效，但是当它处于拔出状态（USB）时，它仍然会得到dwcValues = 1，dwcMaxValueName = 17，＆amp; dwcMaxValueData = 10。