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I am using a free application virtualization app - Winflector.

When I use GetSystemMetrics(SM_REMOTESESSION) the function correctly detects that application is running in a remote session, however, WTSQuerySessionInformationA() fails to detect and thus cannot get WTSClientInfo . I want to know, what is difference in the functionalities of these APIs. Also, I am interested in knowing how can I programmatically detect client Side information when running through these kind of applications.

if (GetSystemMetrics(SM_REMOTESESSION))  //passes
        printf("\n\n\tSM_REMOTESESSION says this application is running in a remote session \n");
if (WTSQuerySessionInformationA(WTS_CURRENT_SERVER_HANDLE, WTS_CURRENT_SESSION, WTSIsRemoteSession, &pData, &bytesReturned)){   //fails
Also wanted to know if there is a possibility that these kind of applications may employ virtual channels (or dynamic virtual channels) infrastructure of windows?
                From WTSQuerySessionInformationA: "If the function fails, the return value is zero. To get extended error information, call GetLastError." Unless you want to compile your code to run on Win9x, call the Unicode version of the API.
– IInspectable
                May 19, 2020 at 11:22
                @IInspectable I tried to look into the error code and it was 2250 that means "no connection". That becomes my question, why the same is not a problem for GetSystemMetrics(). Thanks
– ultimate cause
                May 19, 2020 at 13:12
                @ultimatecause See WTSIsRemoteSession always returns TRUE for how to use WTSIsRemoteSession.
– Remy Lebeau
                May 19, 2020 at 16:39
                @RemyLebeau Thanks for second help on same day. In the link you pasted, you emphasized on return value of the function rather than OUT parameter (plz correct me). So, do you mean to say that I should still be referring to OUT parameter, despite getting a failure as return value. I am getting different value only in the case of this application (Winflector). In the RDP sessions I get correct results. Little emphasis please.
– ultimate cause
                May 19, 2020 at 18:33
                @ultimatecause if you read the answer I had posted, I actually cover BOTH possibilities. You will have to test both ways to see which way is actually implemented by Windows. I didn't test it myself. "I am getting different value only in the case of this application (Winflector). In the RDP sessions I get correct results" - what do you mean? I don't understand what you are saying now.
– Remy Lebeau
                May 19, 2020 at 18:44
        
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