I get 'A 32 bit processes cannot access modules of a 64 bit process.' exception invoking Process.Start()

问题:

Here is the code sample

var startInfo = new ProcessStartInfo {     Arguments = commandStr,     FileName = @"C:\Windows\SysWOW64\logman.exe", };  using (var createCounterProc = new Process { StartInfo = startInfo }) {     createCounterProc.Start();     createCounterProc.WaitForExit(); } 

After running the code I get "A 32 bit processes cannot access modules of a 64 bit process." message in MainModule (NativeErrorCode:299). My solution is configured to AnyCPU. I've tried both 64 and 32 bit versions of logman.exe (C:\Windows\SysWOW64\logman.exe and C:\Windows\System32\logman.exe) but I still have the same error. My OS is Win8.1Prox64. What could cause the problem?

Stack trace:

at System.Diagnostics.NtProcessManager.GetModuleInfos(Int32 processId, Boolean firstModuleOnly)    at System.Diagnostics.NtProcessManager.GetFirstModuleInfo(Int32 processId)    at System.Diagnostics.Process.get_MainModule() 

Here is the Build configuration: enter image description here

回答1:

Choosing Any CPU for Platform target is not enough, you also have to uncheck Prefer 32-bit, otherwise the application will still be run as a 32-bit application.

This is only possible on application projects, not on library project. If your project is a library, you must do it in the project using your library.

回答2:

After investigation I realized that Logman.exe is unmanaged code, so it cannot return a .NET object as MainModule, so it's a normal behavior. I'ts just slightly confusing error message for Win32Exception. It doesn't influence the execution of Process.Start().

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