From c278df081f0078f7617a10a4cc41818baff2c156 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 14 Jun 2013 14:33:02 +0200
Subject: [PATCH] Create minidump file if FreeCAD crashes on Windows

---
 src/Main/MainGui.cpp | 106 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)

diff --git a/src/Main/MainGui.cpp b/src/Main/MainGui.cpp
index 03407c52d6..fdb417da2c 100644
--- a/src/Main/MainGui.cpp
+++ b/src/Main/MainGui.cpp
@@ -161,6 +161,10 @@ private:
     QDomDocument domDocument;
 };
 
+#if defined(_MSC_VER)
+void InitMiniDumpWriter(const std::string&);
+#endif
+
 #if defined (FC_OS_LINUX) || defined(FC_OS_BSD)
 QString myDecoderFunc(const QByteArray &localFileName)
 {
@@ -224,6 +228,12 @@ int main( int argc, char ** argv )
 
         // Inits the Application 
         App::Application::init(argc,argv);
+#if defined(_MSC_VER)
+        // create a dump file when the application crashes
+        std::string dmpfile = App::Application::getUserAppDataDir();
+        dmpfile += "crash.dmp";
+        InitMiniDumpWriter(dmpfile);
+#endif
         Gui::Application::initApplication();
         Base::Interpreter().replaceStdOutput();
     }
@@ -325,3 +335,99 @@ int main( int argc, char ** argv )
 
     return 0;
 }
+
+#if defined(_MSC_VER)
+#include <windows.h>
+#include <dbghelp.h>
+
+typedef BOOL (__stdcall *tMDWD)(
+  IN HANDLE hProcess,
+  IN DWORD ProcessId,
+  IN HANDLE hFile,
+  IN MINIDUMP_TYPE DumpType,
+  IN CONST PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam, OPTIONAL
+  IN CONST PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam, OPTIONAL
+  IN CONST PMINIDUMP_CALLBACK_INFORMATION CallbackParam OPTIONAL
+  );
+
+static tMDWD s_pMDWD;
+static HMODULE s_hDbgHelpMod;
+static MINIDUMP_TYPE s_dumpTyp = MiniDumpNormal;
+static std::string s_szMiniDumpFileName;  // initialize with whatever appropriate...
+
+static LONG __stdcall MyCrashHandlerExceptionFilter(EXCEPTION_POINTERS* pEx)
+{
+#ifdef _M_IX86
+  if (pEx->ExceptionRecord->ExceptionCode == EXCEPTION_STACK_OVERFLOW)
+  {
+    // be sure that we have enought space...
+    static char MyStack[1024*128];
+    // it assumes that DS and SS are the same!!! (this is the case for Win32)
+    // change the stack only if the selectors are the same (this is the case for Win32)
+    //__asm push offset MyStack[1024*128];
+    //__asm pop esp;
+    __asm mov eax,offset MyStack[1024*128];
+    __asm mov esp,eax;
+  }
+#endif
+  bool bFailed = true;
+  HANDLE hFile;
+  hFile = CreateFile(s_szMiniDumpFileName.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+  if (hFile != INVALID_HANDLE_VALUE)
+  {
+    MINIDUMP_EXCEPTION_INFORMATION stMDEI;
+    stMDEI.ThreadId = GetCurrentThreadId();
+    stMDEI.ExceptionPointers = pEx;
+    stMDEI.ClientPointers = TRUE;
+    // try to create an miniDump:
+    if (s_pMDWD(
+      GetCurrentProcess(),
+      GetCurrentProcessId(),
+      hFile,
+      s_dumpTyp,
+      &stMDEI,
+      NULL,
+      NULL
+      ))
+    {
+      bFailed = false;  // suceeded
+    }
+    CloseHandle(hFile);
+  }
+
+  if (bFailed)
+  {
+    return EXCEPTION_CONTINUE_SEARCH;
+  }
+
+  // Optional display an error message
+  // FatalAppExit(-1, ("Application failed!"));
+
+
+  // or return one of the following:
+  // - EXCEPTION_CONTINUE_SEARCH
+  // - EXCEPTION_CONTINUE_EXECUTION
+  // - EXCEPTION_EXECUTE_HANDLER
+  return EXCEPTION_CONTINUE_SEARCH;  // this will trigger the "normal" OS error-dialog
+}
+
+void InitMiniDumpWriter(const std::string& filename)
+{
+  if (s_hDbgHelpMod != NULL)
+    return;
+  s_szMiniDumpFileName = filename;
+
+  // Initialize the member, so we do not load the dll after the exception has occured
+  // which might be not possible anymore...
+  s_hDbgHelpMod = LoadLibrary(("dbghelp.dll"));
+  if (s_hDbgHelpMod != NULL)
+    s_pMDWD = (tMDWD) GetProcAddress(s_hDbgHelpMod, "MiniDumpWriteDump");
+
+  // Register Unhandled Exception-Filter:
+  SetUnhandledExceptionFilter(MyCrashHandlerExceptionFilter);
+
+  // Additional call "PreventSetUnhandledExceptionFilter"...
+  // See also: "SetUnhandledExceptionFilter" and VC8 (and later)
+  // http://blog.kalmbachnet.de/?postid=75
+}
+#endif