QT 如何判断电脑已安装某个软件
如何判断Windows电脑是否已经安装了某个软件？一般而言，通过安装包形式安装的软件，都会把卸载信息写入到注册表，本文正是通过读取注册表的方式来判断是否已安装了该款软件，详见下面代码：
#include <QCoreApplication>
#include <QSettings>
#include <QDebug>bool is64bitOperatingSystem()
{return sizeof(void *) == 8;
}//如果返回不为空则表示已安装
QString HasInstall(const QString &softName)
{QString header = "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\";bool is64bit = is64bitOperatingSystem();if(is64bit){header = "HKEY_LOCAL_MACHINE\\SOFTWARE\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\";}QSettings settings(header, QSettings::NativeFormat);QStringList regGroups = settings.childGroups();foreach (QString regItem, regGroups){settings.beginGroup(regItem);QString displayName = settings.value("DisplayName").toString();QString installPath = settings.value("InstallLocation").toString();QString uninstallString = settings.value("UninstallString").toString();if(displayName.contains(softName)){QString filePath = installPath.replace("\\", "/");return filePath;}settings.endGroup();}return "";
}int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);//QString path = HasInstall("Chemiluminescence");qDebug() << "path" << path;//return a.exec();
}