QT 自动获取可用串口

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本来想直接用Settings来获取的，但是串口信息类似 "DeviceSerial0"，死活获取不了，用了转义、反斜杠还是获取不到，所以就放弃了，网上好像也没有获取成功的。
所以就用winapi来获取了，参考了网上源码

cpp文件
/*
    初始化串口
*/
void MainWindow::init_comm()
{
    QString path = "HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM";
    QSettings *settings = new QSettings(path, QSettings::NativeFormat);
    QStringList key = settings->allKeys();
    QStringList comlist ;
    QStringList Baudlist ;
//    QStringList Paritylist ;
//    QStringList DataBitslist;
//    QStringList StopBitslist;
//    QStringList ControlFlowlist;

    comlist.clear();

    /* 取串口名 */
    for (int i=0; i<key.size(); i++) {
        comlist << getcomm(i, "value");
    }
    ui->ComPortcomboBox->addItems(comlist);

    ....
}

/*
    读取键值
*/
QString MainWindow::getcomm(int index, QString keyorvalue)
{
    QString commresult;

    if (::RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("HARDWARE\DEVICEMAP\SERIALCOMM"), 0, KEY_READ, &hKey) != 0) {
            QString error="Cannot open regedit!";//无法打开注册表时返回error
            return error;
        }//if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE,subkey,0,KEY_READ,&hKey)!=0)

        QString keymessage;//键名
        QString message;
        QString valuemessage;//键值

        indexnum = index;//要读取键值的索引号
        keysize = sizeof(keyname);
        valuesize = sizeof(keyvalue);

        if (RegEnumValue(hKey, indexnum, keyname, &keysize, 0, &type, (BYTE*)keyvalue, &valuesize) == 0) { //列举键名和值
            for (int i=0; i<(int)keysize; i++) {
                message = keyname[i];
                keymessage.append(message);
            }

            for (int j=0; j<(int)valuesize; j++) {
                 if (keyvalue[j] != 0x00) {
                     valuemessage.append(keyvalue[j]);
                 }
            }

            if (keyorvalue == "key") {
                 commresult = keymessage;
            }

            if (keyorvalue == "value") {
                 commresult=valuemessage;
            }
        } else {
             commresult = "nokey";
        }

        RegCloseKey(hKey);//关闭注册表

        return commresult;
}

.h文件

#include <QSettings>
#include <qt_windows.h>
    HKEY hKey;
    LPCWSTR subkey;
    wchar_t keyname[256]; //键名数组
    char keyvalue[256];  //键值数组
    DWORD keysize,type,valuesize;
    int indexnum;

http://blog.csdn.net/emdfans/article/details/38588537