Use a undocumented variable as the nsDialogs::OnNotify return value so we don't have to worry about restoring it

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@7055 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/nsDialogs/defs.h

@@ -7,6 +7,7 @@
 
 #define NSDFUNC WINAPI
 
+#define GetVar(vars, varlen, varid) ( (vars) + ((varid) * (varlen)) )
 #define DlgRet(hDlg, val) ( SetWindowLongPtr((hDlg), DWLP_MSGRESULT, (val)) | TRUE )
 #define StrToIntPtr nsishelper_str_to_ptr
 

Contrib/nsDialogs/example.nsi

@@ -1,3 +1,4 @@
+
 !include nsDialogs.nsh
 !include LogicLib.nsh
 !include WinCore.nsh ; MAKELONG

Contrib/nsDialogs/nsDialogs.c

@@ -19,7 +19,7 @@
 HINSTANCE g_hInstance;
 struct nsDialog g_dialog;
 extra_parameters* g_pluginParms;
-LPTSTR g_var0;
+LPTSTR g_callbackRetVar;
 
 static COLORREF GetLinkColor()
 {
@@ -165,7 +165,7 @@ INT_PTR CALLBACK DialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPara
       g_pluginParms->ExecuteCodeSegment(ctl->callbacks.onNotify - 1, 0);
       ret = *pFlag, *pFlag = orgFlag;
       if (ret)
-        return DlgRet(hwndDlg, StrToIntPtr(g_var0));
+        return DlgRet(hwndDlg, StrToIntPtr(g_callbackRetVar));
     }
     break;
 
@@ -273,7 +273,7 @@ void __declspec(dllexport) Create(HWND hwndParent, int string_size, TCHAR *varia
 
   g_dialog.hwParent = hwndParent;
   g_pluginParms = extra;
-  g_var0 = variables;
+  g_callbackRetVar = GetVar(variables, string_size, 31); // The undocumented $_OUTDIR variable
 
   hwPlacementRect = GetDlgItem(hwndParent, popint());
   GetWindowRect(hwPlacementRect, &rcPlacement);

Contrib/nsDialogs/nsDialogs.nsh

@@ -415,9 +415,7 @@ Header file for creating custom installer pages with nsDialogs
 
 !define NSD_Return "!insertmacro NSD_Return "
 !macro NSD_Return val
-!if "${val}" != "$0"
-	StrCpy $0 ${val}
-!endif
+StrCpy $_OUTDIR ${val}
 SetSilent silent
 Return
 !macroend

Source/build.cpp

@@ -344,7 +344,7 @@ CEXEBuild::CEXEBuild(signed char pponly, bool warnaserror) :
   m_UserVarNames.add(_T("EXEFILE"),-1);      // 28
   m_UserVarNames.add(_T("HWNDPARENT"),-1);   // 29
   m_UserVarNames.add(_T("_CLICK"),-1);       // 30
-  m_UserVarNames.add(_T("_OUTDIR"),1);       // 31
+  m_UserVarNames.add(_T("_OUTDIR"),1);       // 31 Note: nsDialogs also uses this
 
   m_iBaseVarsNum = m_UserVarNames.getnum();