MFC下自動識別串口的實現

摘自：http://blog.csdn.net/itas109/article/details/18359295

程序：http://blog.csdn.net/itas109/article/details/18359295

serial類裏邊的兩個函數

void CSerialPort::Hkey2ComboBox(CComboBox& m_PortNO)
{
    HKEY hTestKey;
    bool Flag = FALSE;

    ///僅是XP系統的註冊表位置，其他系統根據實際情況做修改
    if(ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("HARDWARE\\DEVICEMAP\\SERIALCOMM"), 0, KEY_READ, &hTestKey) ){
        QueryKey(hTestKey);
    }
    RegCloseKey(hTestKey);

    int i = 0;
    m_PortNO.ResetContent();///刷新時，清空下拉列表內容
    while(i < MaxSerialPortNum && -1 != m_nComArray[i]){
        CString szCom;
        szCom.Format(_T("COM%d"), m_nComArray[i]);
        m_PortNO.InsertString(i, szCom.GetBuffer(5));
        ++i;
        Flag = TRUE;
        if (Flag)///把第一個發現的串口設爲下拉列表的默認值
            m_PortNO.SetCurSel(0);
    }

}

///查詢註冊表的串口號，將值存於數組中
///本代碼參考於mingojiang的獲取串口邏輯名代碼
//
void CSerialPort::QueryKey(HKEY hKey)
{
    #define MAX_KEY_LENGTH 255
    #define MAX_VALUE_NAME 16383
    //  TCHAR    achKey[MAX_KEY_LENGTH];   // buffer for subkey name
    //  DWORD    cbName;                   // size of name string
    TCHAR    achClass[MAX_PATH] = TEXT("");  // buffer for class name
    DWORD    cchClassName = MAX_PATH;  // size of class string
    DWORD    cSubKeys=0;               // number of subkeys
    DWORD    cbMaxSubKey;              // longest subkey size
    DWORD    cchMaxClass;              // longest class string
    DWORD    cValues;              // number of values for key
    DWORD    cchMaxValue;          // longest value name
    DWORD    cbMaxValueData;       // longest value data
    DWORD    cbSecurityDescriptor; // size of security descriptor
    FILETIME ftLastWriteTime;      // last write time

    DWORD i, retCode;

    TCHAR  achValue[MAX_VALUE_NAME];
    DWORD cchValue = MAX_VALUE_NAME;

    // Get the class name and the value count.
    retCode = RegQueryInfoKey(
        hKey,                    // key handle
        achClass,                // buffer for class name
        &cchClassName,           // size of class string
        NULL,                    // reserved
        &cSubKeys,               // number of subkeys
        &cbMaxSubKey,            // longest subkey size
        &cchMaxClass,            // longest class string
        &cValues,                // number of values for this key
        &cchMaxValue,            // longest value name
        &cbMaxValueData,         // longest value data
        &cbSecurityDescriptor,   // security descriptor
        &ftLastWriteTime);       // last write time

    for (i=0;i<20;i++)///存放串口號的數組初始化
    {
        m_nComArray[i] = -1;
    }

    // Enumerate the key values.
    if (cValues > 0) {
        for (i=0, retCode=ERROR_SUCCESS; i<cValues; i++) {
            cchValue = MAX_VALUE_NAME;  achValue[0] = '\0';
            if (ERROR_SUCCESS == RegEnumValue(hKey, i, achValue, &cchValue, NULL, NULL, NULL, NULL))  {
                CString szName(achValue);
//              if (-1 != szName.Find(_T("Serial")) || -1 != szName.Find(_T("VCom")) ){
                if (-1 != szName.Find(_T("Serial")) || -1 != szName.Find(_T("VCom")) || -1 != szName.Find(_T("Silabser"))){
                    BYTE strDSName[10]; memset(strDSName, 0, 10);
                    DWORD nValueType = 0, nBuffLen = 10;
                    if (ERROR_SUCCESS == RegQueryValueEx(hKey, (LPCTSTR)achValue, NULL, &nValueType, strDSName, &nBuffLen)){
                        int nIndex = -1;
                        while(++nIndex < MaxSerialPortNum){
                            if (-1 == m_nComArray[nIndex]) {
                                m_nComArray[nIndex] = atoi((char*)(strDSName + 3));
                                break;
                            }
                        }
                    }
                }
            }
        }
    }
    else{
        AfxMessageBox(_T("本機沒有串口....."));
    }

}