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44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
From b9716dfe5f6283f83131fe6a638eea14c137ceb4 Mon Sep 17 00:00:00 2001
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From: Daniel Santos <daniel.santos@pobox.com>
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Date: Mon, 15 Oct 2012 15:12:59 -0500
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Subject: user32: Don't ignore return/error value of MapWindowPoints
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ScreenToClient should return zero if the operation fails, but is always
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returning TRUE. This patch corrects the problem and solves a crash bug
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in Lord of the Rings Online (bug #31979)
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Credit for discovering the source of this problem should go to somebody
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else, as yet unidentified, since the original patch came from a closed
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forum for beta testers of the LoTRO Riders of Rohan expansion and the
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forum has subsequently been wiped. However, I'll take credit for fixing
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it up, but if I ever figure out where it came from, hopefully they can
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get credit as well.
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---
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dlls/user32/winpos.c | 11 +++++++++--
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1 files changed, 9 insertions(+), 2 deletions(-)
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diff --git a/dlls/user32/winpos.c b/dlls/user32/winpos.c
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index 5a2f1f2..80aab32 100644
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--- a/dlls/user32/winpos.c
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+++ b/dlls/user32/winpos.c
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@@ -250,8 +250,15 @@ BOOL WINAPI ClientToScreen( HWND hwnd, LPPOINT lppnt )
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*/
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BOOL WINAPI ScreenToClient( HWND hwnd, LPPOINT lppnt )
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{
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- MapWindowPoints( 0, hwnd, lppnt, 1 );
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- return TRUE;
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+ DWORD old_err = GetLastError();
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+ BOOL ret;
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+
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+ SetLastError(0xd00d13);
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+ ret = MapWindowPoints( 0, hwnd, lppnt, 1 ) != 0 ||
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+ GetLastError() != 0xd00d13;
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+ SetLastError(old_err);
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+
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+ return ret;
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}
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--
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1.7.3.4
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