Win32: call an existing debugger if a DissectorError is thrown. This preserves the call stack of the bug making debugging much easier.

This can't be done in every error throwing case, as e.g. throwing a ReportedBoundsError might happen a lot even if no bugs are involved. Anyway, extending this to other errors can be done manually while debugging.

svn path=/trunk/; revision=17072

epan/except.c

@@ -33,6 +33,13 @@
 #include <limits.h>
 #include "except.h"
 
+#ifdef _WIN32
+/* IsDebuggerPresent() needs this #define! */
+#define _WIN32_WINNT 0x0400
+#include <windows.h>
+#include "exceptions.h"
+#endif
+
 #define XCEPT_BUFFER_SIZE	1024
 
 #ifdef KAZLIB_RCSID
@@ -268,6 +275,12 @@ void except_throw(long group, long code, const char *msg)
     except.except_message = msg;
     except.except_dyndata = 0;
 
+#ifdef _WIN32
+    if (code == DissectorError && IsDebuggerPresent()) {
+        DebugBreak();
+    }
+#endif
+
     do_throw(&except);
 }