From: Michael Curran <mick@kulgan.net>
Date: Wed, 23 Mar 2011 01:46:15 +0000 (+1000)
Subject: nvdaHelper fake_createCompatibleDc: don't create a new displayModel if the real_creat... 
X-Git-Tag: jpdev130418~1908
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=10336808782b76d45a7f70f8e4e0955ba2b1fc5e;p=nvdajp%2Fnvdajp.git

nvdaHelper fake_createCompatibleDc: don't create a new displayModel if the real_createCompatibleDc returns NULL. Very rare, but could happen.
---

diff --git a/nvdaHelper/remote/gdiHooks.cpp b/nvdaHelper/remote/gdiHooks.cpp
index 3732d62f2..95a4684fb 100644
--- a/nvdaHelper/remote/gdiHooks.cpp
+++ b/nvdaHelper/remote/gdiHooks.cpp
@@ -431,6 +431,7 @@ HDC WINAPI fake_CreateCompatibleDC(HDC hdc) {
 	//If the creation was successful, and the DC that was used in the creation process is a window DC, 
 	//we should create a displayModel for this DC so that text writes can be tracked in case  its ever bit blitted to a window DC. 
 	//We also need to acquire access to the model maps while we do this
+	if(!newHdc) return NULL;
 	displayModel_t* model=new displayModel_t();
 	displayModelsByMemoryDC.acquire();
 	displayModelsByMemoryDC.insert(make_pair(newHdc,model));