QProcess

Question

在我的应用程序中，我运行从我的本地应用程序数据文件夹中分离了一个进程。以下代码适用于大多数情况。

void executeApp(const QString &id)
{
    QString program = QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation);
    program = program + "\..\Programs\MyApp.exe";
    QStringList arguments;
    arguments << "--app_id="+id; //it is only one argument
    QProcess* process = new QProcess(this);
    bool success = process->startDetached(program, arguments);
    if (!success) //TODO: Error handling
        qDebug() << "Couldn't start process at " << program << process->errorString();

}

运行一些测试，我发现当 Windows 帐户用户名中包含空格时它不起作用（Windows 实际上允许）。

如何解决？

--- 编辑：

根据发布的答案，我对代码做了一些更改。但是我仍然从下面的代码在 QMessageBox 上得到 "Unknown Error"：

void executeApp(const QString &id)
{
    QString program = QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation);
    program = QDir(program + "/../Programs/MyApp.exe").absolutePath();
    QStringList arguments;
    arguments << "--app_id="+id; //it is only one argument
    QProcess* process = new QProcess(this);
    bool success = process->startDetached(program, arguments);

    if (!success) 
        QMessageBox::critical(NULL, tr("Launching App"), process->errorString());
}

加强，只有在用户名中有一个空格的用户时才会发生...

Answer 1

QString QDir::absolutePath() const

Returns the absolute path (a path that starts with "/" or with a drive specification), which may contain symbolic links, but never contains redundant ".", ".." or multiple separators.

将路径从根转换为绝对形式是有意义的：

QString dataPath = QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation);
QString exePath = QDir(dataPath + "/../Programs").absolutePath();
qDebug() << "Executable path" << exepath;
qDebug() << "File exists" << QFile(exepath + "/MyApp.exe").exists();

至于另一个问题，由于路径中包含用户名中的空格，它无法运行执行。我们应该将整个路径用引号引起来，以便 Windows CreateProcess 满足：

process->startDetached(QStringLiteral("\"") + exepath + "/MyApp.exe" + QChar("\""), arguments);

请注意，Qt 通常能够接受路径参数的反斜杠“\”和斜杠“/”分隔符。

Answer 2

您可以尝试使用QDir解析路径：

QDir dataDir(QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation));
QString program = dataDir.absolutePath("../Programs/MyApp.exe");

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