如何测试，如果另一个安装正在进行中？ [英] How do I test if another installation is already in progress?

问题描述

假设我想自动在Windows的东西安装和我想尝试测试另一个安装是否正在尝试安装之前。我没有在安装程序的控制和必须这样做，在自动化框架。有没有更好的方式来做到这一点，一些Win32 API的？如果MSIEXEC运行不仅仅是测试？

[更新2]

改进我一直在使用，只是直接访问互斥前面的代码，这是很多更可靠的：

 使用的System.Threading; 
 
 [...] 
 
 ///<总结> 
 ///等待（最多一个超时）为MSI安装服务成为自由的。 
 ///< /总结> 
 ///<退货和GT; 
 ///一个成​​功的等待返回true，当安装程序服务已成为自由。 
 ///等待安装服务时返回false已超过超时。 
 ///< /回报> 
公共静态布尔WaitForInstallerServiceToBeFree（时间跨度maxWaitTime）
 {
 //的_MSIExecute互斥体所使用的MSI安装服务，安装序列
 //和防止多种基于MSI的安装在发生同一时间。 
 //欲了解更多信息：http://msdn.microsoft.com/en-us/library/aa372909(VS.85).aspx 
常量字符串installerServiceMutexName =Global\\_MSIExecute ; 
 
试
 {
互斥MSIExecuteMutex = Mutex.OpenExisting（installerServiceMutexName，
 System.Security.AccessControl.MutexRights.Synchronize）; 
布尔waitSuccess = MSIExecuteMutex.WaitOne（maxWaitTime，FALSE）; 
 MSIExecuteMutex.ReleaseMutex（）; 
返回waitSuccess; 
} 
赶上（WaitHandleCannotBeOpenedException）
 {
 //互斥锁不存在，则什么也不做
} 
赶上（的ObjectDisposedException）
 { 
 //互斥的处置打开它，并试图之间等待就可以了，什么都不做
} 
返回真; 
} 
  

解决方案

请参阅的说明< A HREF =htt​​p://msdn.microsoft.com/en-us/library/aa372909(VS.85).aspx> _MSIExecute互斥的MSDN上。

Assuming I'm trying to automate the installation of something on windows and I want to try to test whether another installation is in progress before attempting install. I don't have control over the installer and have to do this in the automation framework. Is there a better way to do this, some win32 api?, than just testing if msiexec is running?

[Update 2]

Improved the previous code I had been using to just access the mutex directly, this is a lot more reliable:

using System.Threading;

[...]

/// <summary>
/// Wait (up to a timeout) for the MSI installer service to become free.
/// </summary>
/// <returns>
/// Returns true for a successful wait, when the installer service has become free.
/// Returns false when waiting for the installer service has exceeded the timeout.
/// </returns>
public static bool WaitForInstallerServiceToBeFree(TimeSpan maxWaitTime)
{
    // The _MSIExecute mutex is used by the MSI installer service to serialize installations
    // and prevent multiple MSI based installations happening at the same time.
    // For more info: http://msdn.microsoft.com/en-us/library/aa372909(VS.85).aspx
    const string installerServiceMutexName = "Global\\_MSIExecute";

    try
    {
        Mutex MSIExecuteMutex = Mutex.OpenExisting(installerServiceMutexName, 
            System.Security.AccessControl.MutexRights.Synchronize);
        bool waitSuccess = MSIExecuteMutex.WaitOne(maxWaitTime, false);
        MSIExecuteMutex.ReleaseMutex();
        return waitSuccess;
    }
    catch (WaitHandleCannotBeOpenedException)
    {
        // Mutex doesn't exist, do nothing
    }
    catch (ObjectDisposedException)
    {
        // Mutex was disposed between opening it and attempting to wait on it, do nothing
    }
    return true;
}

解决方案

See the description of the _MSIExecute Mutex on MSDN.

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