[PATCH v3 1/1] msvfw32: Use string comparison to determine class name equality.

[Alexandros Frantzis]

From: Alexandros Frantzis

The current version of the code incorrectly assumes that the lpszClass
member of CREATESTRUCT passed with WM_CREATE will point to the same
memory used for the CreateWindowEx class name parameter, and uses a
pointer comparison to check for class name equality.

As a side effect of commit e41c255be6ba66d1eec7affe674b8cc7699226b8
"win32u: Use send_message_timeout for WM_CREATE and WM_NCCREATE" the
CREATESTRUCT lpszClass member started pointing to different memory,
breaking the current implementation of MCIWND_Create().

This commit fixes the problem by performing a proper, case-insensitive
string comparison to determine class name equality.

Wine-bug: https://bugs.winehq.org/show_bug.cgi?id=53578
---
 dlls/msvfw32/mciwnd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/msvfw32/mciwnd.c b/dlls/msvfw32/mciwnd.c
index 8799293f7c9..3dc8d6f3542 100644
--- a/dlls/msvfw32/mciwnd.c
+++ b/dlls/msvfw32/mciwnd.c
@@ -314,8 +314,8 @@ static LRESULT MCIWND_Create(HWND hWnd, LPCREATESTRUCTW cs)
         else
             lParam = (LPARAM)cs->lpCreateParams;

-        /* If it's our internal class pointer, file name is a unicode string */
-        if (cs->lpszClass == mciWndClassW)
+        /* If it's our internal class name, file name is a unicode string */
+        if (!lstrcmpiW(cs->lpszClass, mciWndClassW))
             SendMessageW(hWnd, MCIWNDM_OPENW, 0, lParam);
         else
         {