WTSEnumerateProcessesA function (wtsapi32.h)

Retrieves information about the active processes on a specified Remote Desktop Session Host (RD Session Host) server.


BOOL WTSEnumerateProcessesA(
  [in]  HANDLE             hServer,
  [in]  DWORD              Reserved,
  [in]  DWORD              Version,
  [out] PWTS_PROCESS_INFOA *ppProcessInfo,
  [out] DWORD              *pCount


[in] hServer

Handle to an RD Session Host server. Specify a handle opened by the WTSOpenServer function, or specify WTS_CURRENT_SERVER_HANDLE to indicate the RD Session Host server on which your application is running.

[in] Reserved

Reserved; must be zero.

[in] Version

Specifies the version of the enumeration request. Must be 1.

[out] ppProcessInfo

Pointer to a variable that receives a pointer to an array of WTS_PROCESS_INFO structures. Each structure in the array contains information about an active process on the specified RD Session Host server. To free the returned buffer, call the WTSFreeMemory function.

[out] pCount

Pointer to a variable that receives the number of WTS_PROCESS_INFO structures returned in the ppProcessInfo buffer.

Return value

If the function succeeds, the return value is a nonzero value.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


The caller must be a member of the Administrators group to enumerate processes that are running under a different user's context.


The wtsapi32.h header defines WTSEnumerateProcesses as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.


Requirement Value
Minimum supported client Windows Vista
Minimum supported server Windows Server 2008
Target Platform Windows
Header wtsapi32.h
Library Wtsapi32.lib
DLL Wtsapi32.dll
API set ext-ms-win-session-wtsapi32-l1-1-0 (introduced in Windows 8)

See also