QT 自动获取可用串口

QT 自动获取可用串口

1. MainWindow.h头文件中添加依赖的头文件

#include <QSettings>
#include <qt_windows.h>

2.类MainWindow中定义变量，声明函数

public:
   //定义变量
    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;
 
   //声明函数
    QString getcomm(int index, QString keyorvalue);
    void init_comm();

3. MainWindow.cpp源文件中实现

QString MainWindow::getcomm(int index, QString keyorvalue)
{
    
    
    QString commResult;//返回
    QString keyMessage;
    QString valueMessage;
    QString message;

    //打开注册表
    if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("HARDWARE\\DEVICEMAP\\SERIALCOMM"), 0, KEY_READ, &hKey) != 0)
    {
    
    
        qDebug("Cannot open reg!");
        return "Error";
    }

    indexnum = index;
    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;
}

void MainWindow::init_comm()
{
    
    
    QString path = "HKEY_LOCAL_MACHINE\\HARDWARE\\DEVICEMAP\\SERIALCOMM";
    QSettings *settings = new QSettings(path, QSettings::NativeFormat);
    QStringList keylist = settings->allKeys();
    QStringList comlist;
    comlist.clear();

    /* 获取串口名 */
    for (int i = 0; i < keylist.size(); i++)
    {
    
    
        if(getcomm(i, "value") != "Error" &&  getcomm(i, "value") != "nokey")
        {
    
    
             comlist << getcomm(i, "value");
        }
    }
    ui->portNameComboBox->addItems(comlist);
}

4.在构造函数中进行调用init_comm()即可。