Quickly solve the Chinese input method problem under Linux

Background: I'm working on asset reporting related functions recently, and I need to support Chinese input. If the program is started with a normal shortcut, there is no problem. However, when upgrading or uninstalling and reinstalling, it is started with su usr -C XX.sh. It is impossible to obtain the user's environment variables when started under root. Let's start our adventure. . .

Exploration: By comparing the environment variables of root and user through export printing, and searching for issues related to input methods under linux in google, I found the variable QT_IM_MODULE. Different systems may have ibus or fctix or other variables, etc.

Solution: Because the program needs to be started manually by the user when it is installed for the first time, we need to add the code to get the value of QT_IM_MODULE under the current user, and then write it to a global file, and then get the value of this global variable in the hook script. In the startup script, just set export QT_IM_MODULE=XX. The code is shown below.

The code has something to say:

1. Code that needs to be added to the program:

//Add global Chinese input method environment variable QString qstrInputMethod = path;
    qstrInputMethod += "/.local/sdforcnos/sdforcnos.inputMethod";
    char *pInputEnv = getenv("QT_IM_MODULE");
    if(pInputEnv != NULL)
    {
      QString qstrCMD = QString("echo %1 > %2").arg(pInputEnv).arg(qstrInputMethod);
      system(qstrCMD.toStdString().c_str());
      printf("---%s-----------QT_IM_MODULE=%s\n", qstrCMD.toStdString().c_str(), pInputEnv);
    }

2. Code required by the hook script:

 if [ -e "/home/${user}/.local/sdforcnos/sdforcnos.inputMethod" ];then
     inputEnv=`cat /home/${user}/.local/sdforcnos/sdforcnos.inputMethod`
     if [ ! -z "$inputEnv" ]; then
       export QT_IM_MODULE="$inputEnv"
     fi
    fi
    su $user -c "/usr/bin/startsd &"

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