C++ 启动默认浏览器

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HKEY hkRoot,hSubKey; //定义注册表根关键字及子关键字
    char ValueName[256];
    unsigned char DataValue[256];
    unsigned long cbValueName=256;
    unsigned long cbDataValue=256;
    char ShellChar[256]; //定义命令行
    DWORD dwType;

    //打开注册表根关键字
    if(RegOpenKey(HKEY_CLASSES_ROOT,NULL,&hkRoot)==ERROR_SUCCESS)
    {
    //打开子关键字
        if(RegOpenKeyEx(hkRoot,
        "htmlfile//shell//open//command",
                    0,
                    KEY_ALL_ACCESS,
                    &hSubKey)==ERROR_SUCCESS)
        {
            //读取注册表,获取默认浏览器的命令行    
            RegEnumValue(hSubKey,
                0,
                        ValueName,
                        &cbValueName,
                        NULL,
                        &dwType,
                        DataValue,
                        &cbDataValue);
            // 调用参数(主页地址)赋值
            strcpy(ShellChar,(char *)DataValue);
            strcat(ShellChar," www.neaase.net/~xiaohui");
            // 启动浏览器
            WinExec(ShellChar,SW_SHOW);

        }
        else
            MessageBox("WEB浏览器打开错误!","错误",MB_OK);
    }
    else
        MessageBox("WEB浏览器打开错误!","错误",MB_OK);
    //关闭注册表
    RegCloseKey(hSubKey);
    RegCloseKey(hkRoot);