[PATCH 4/5] user32: Pass real argument to NtUserGetClassName in RealGetWindowClass{A/W}.

[Connor McAdams]

From: Connor McAdams <[e-mail]>

Signed-off-by: Connor McAdams <[e-mail]>
---
 dlls/user32/class.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/dlls/user32/class.c b/dlls/user32/class.c
index eb28b03479a..8c80126c90b 100644
--- a/dlls/user32/class.c
+++ b/dlls/user32/class.c
@@ -501,7 +501,14 @@ INT WINAPI GetClassNameW( HWND hwnd, LPWSTR buffer, INT count )
  */
 UINT WINAPI RealGetWindowClassA( HWND hwnd, LPSTR buffer, UINT count )
 {
-    return GetClassNameA( hwnd, buffer, count );
+    WCHAR tmpbuf[MAX_ATOM_LEN + 1];
+    DWORD len;
+
+    if (count <= 0) return 0;
+    if (!RealGetWindowClassW( hwnd, tmpbuf, ARRAY_SIZE( tmpbuf ))) return 0;
+    RtlUnicodeToMultiByteN( buffer, count - 1, &len, tmpbuf, lstrlenW(tmpbuf) * sizeof(WCHAR) );
+    buffer[len] = 0;
+    return len;
 }
 
 
@@ -510,7 +517,8 @@ UINT WINAPI RealGetWindowClassA( HWND hwnd, LPSTR buffer, UINT count )
  */
 UINT WINAPI RealGetWindowClassW( HWND hwnd, LPWSTR buffer, UINT count )
 {
-    return GetClassNameW( hwnd, buffer, count );
+    UNICODE_STRING name = { .Buffer = buffer, .MaximumLength = count * sizeof(WCHAR) };
+    return NtUserGetClassName( hwnd, TRUE, &name );
 }
 
 
-- 
GitLab


https://gitlab.winehq.org/wine/wine/-/merge_requests/11012