Added more pointer error checking to the wxvbam build.

git-svn-id: https://svn.code.sf.net/p/vbam/code/trunk@1260 a31d4220-a93d-0410-bf67-fe4944624d44

src/wx/sys.cpp

@@ -474,7 +474,7 @@ class PrintDialog : public wxEvtHandler, public wxPrintout
 public:
     PrintDialog(const u16 *data, int lines, bool cont);
     ~PrintDialog();
-    int ShowModal() { return wxGetApp().frame->ShowModal(dlg); }
+    int ShowModal() {CheckPointer(wxGetApp().frame); return wxGetApp().frame->ShowModal(dlg); }
 private:
     void DoSave(wxCommandEvent&);
     void DoPrint(wxCommandEvent&);

src/wx/wxvbam.cpp

@@ -616,6 +616,7 @@ void MainFrame::MenuPopped(wxMenuEvent &evt)
 // uses dialog_opened as a nesting counter
 int MainFrame::ShowModal(wxDialog *dlg)
 {
+	CheckPointer(dlg);
     StartModal();
     int ret = dlg->ShowModal();
     StopModal();

src/wx/wxvbam.h

@@ -2,6 +2,8 @@
 #define WX_WXVBAM_H
 
 #include <list>
+#include <typeinfo>
+#include <stdexcept>
 #include <wx/propdlg.h>
 
 #include "wxhead.h"
@@ -25,6 +27,18 @@
 #include "../gb/gbCheats.h"
 #include "../gba/Cheats.h"
 
+template <typename T>
+void CheckPointer(T pointer)
+{
+	if(pointer == NULL)
+	{
+		std::string errormessage = "Pointer of type \"";
+		errormessage+=typeid(pointer).name();
+		errormessage+="\" was not correctly created.";
+		throw std::runtime_error(errormessage);
+	}
+}
+
 class MainFrame;
 
 class wxvbamApp : public wxApp