QT Open external programs and folders need to pay attention to the details (QT call VC write dynamic Library, VC need to use C way output function, otherwise MinGW32 compile process will error)

There are a few small details that need to be recorded here in the afternoon writing program.

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QProcess *process = new QProcess(this);    QFileInfo fileinfo(appUrl);    QString appPath = QApplication::applicationDirPath()+SAVEDIR+"/"+fileinfo.fileName();    bool res = process->startDetached(appPath,QStringList());    if (res)    {        accept();    }    else    {        MyHelper::ShowMessageBoxError("下载完成但自动升级失败，请手工安装升级包！");        QDesktopServices::openUrl(QUrl::fromLocalFile(QApplication::applicationDirPath()+SAVEDIR));        reject();    }

• Detail 1:

This was written in the original code:
process->startDetached(appPath);
There is no problem with the test environment, but the production environment cannot invoke external programs and eventually discovers that the file path of the production environment
C:\Program Files (x86)\...With a space, causing the call to fail, so Google then tries to
process->startDetached(appPath,QStringList());
Problem solved.

• Detail 2:

QDesktopServices::openUrl(QUrl(QApplication::applicationDirPath()+SAVEDIR));
The same problem exists in this place, and if you use qurl::fromlocalfile for processing, you can open the folder normally:
QDesktopServices::openUrl(QUrl::fromLocalFile(QApplication::applicationDirPath()+SAVEDIR));

In addition, there is a problem with this code-Independent: QT Call VC write dynamic Library, VC need to use C way output function, otherwise MinGW32 compile process will error, namely:
Example VC DLL header file:

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#ifndef cdoublereaderdll  #ifdef cdoublereaderdll_exports #define cdoublereaderdll extern "C" __declspec (dllexport) #else #define cdoublereaderdll extern" C "__declspec (dllimport) #endif #endif    # define buffersize # define ReadTimeout //open serial port Cdoublereaderdll bool _stdcall  Rd_open ( int iport,unsigned long ibaudrate); ...

Examples of calls in QT:

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1234	extern"C"{    #include "drivers/CdoubleReaderDll.h"}

Reprint Please specify: Under the Sycamore Tree»QT open External programs and folders to pay attention to the details

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QT Open external programs and folders need to pay attention to the details (QT call VC write dynamic Library, VC need to use C way output function, otherwise MinGW32 compile process will error)