wtsapi32: Improve the stub for WTSQuerySessionInformationW.

dlls/wtsapi32/Makefile.in

 MODULE    = wtsapi32.dll
 IMPORTLIB = wtsapi32
+IMPORTS   = advapi32
 
 C_SRCS = \
 	wtsapi32.c

dlls/wtsapi32/tests/wtsapi.c

@@ -90,7 +90,23 @@ static void test_WTSEnumerateProcessesW(void)
     WTSFreeMemory(info);
 }
 
+static void test_WTSQuerySessionInformationW(void)
+{
+    BOOL ret;
+    WCHAR *buf;
+    DWORD count;
+
+    count = 0;
+    buf = NULL;
+    ret = WTSQuerySessionInformationW(WTS_CURRENT_SERVER_HANDLE, WTS_CURRENT_SESSION, WTSUserName, &buf, &count);
+    ok(ret, "got %u\n", GetLastError());
+    ok(buf != NULL, "buf not set\n");
+    ok(count == (lstrlenW(buf) + 1) * sizeof(WCHAR), "got %u\n", count);
+    WTSFreeMemory(buf);
+}
+
 START_TEST (wtsapi)
 {
     test_WTSEnumerateProcessesW();
+    test_WTSQuerySessionInformationW();
 }

dlls/wtsapi32/wtsapi32.c

@@ -233,6 +233,19 @@ BOOL WINAPI WTSQuerySessionInformationW(
     FIXME("Stub %p 0x%08x %d %p %p\n", hServer, SessionId, WTSInfoClass,
         Buffer, BytesReturned);
 
+    if (WTSInfoClass == WTSUserName)
+    {
+        WCHAR *username;
+        DWORD count = 0;
+
+        GetUserNameW(NULL, &count);
+        if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) return FALSE;
+        if (!(username = heap_alloc(count * sizeof(WCHAR)))) return FALSE;
+        GetUserNameW(username, &count);
+        *Buffer = username;
+        *BytesReturned = count * sizeof(WCHAR);
+        return TRUE;
+    }
     return FALSE;
 }
 

include/wtsapi32.h

@@ -136,6 +136,7 @@ DECL_WINELIB_TYPE_AW(WTS_SERVER_INFO)
 DECL_WINELIB_TYPE_AW(PWTS_SERVER_INFO)
 
 #define WTS_CURRENT_SERVER_HANDLE ((HANDLE)NULL)
+#define WTS_CURRENT_SESSION (~0u)
 
 void WINAPI WTSCloseServer(HANDLE);
 BOOL WINAPI WTSConnectSessionA(ULONG, ULONG, PSTR, BOOL);