Added RainmeterQuery.h for querying the data from the other applications by using Window Message. Thus modified some related codes.

Library/Library.vcproj

@@ -2873,16 +2873,20 @@
 				RelativePath="Rainmeter.h"
 				>
 			</File>
+			<File
+				RelativePath="RainmeterQuery.h"
+				>
+			</File>
 			<File
 				RelativePath="resource.h"
 				>
 			</File>
 			<File
-				RelativePath=".\StdAfx.h"
+				RelativePath="StdAfx.h"
 				>
 			</File>
 			<File
-				RelativePath=".\System.h"
+				RelativePath="System.h"
 				>
 			</File>
 			<File

Library/RainmeterQuery.h

@@ -0,0 +1,88 @@
+/*
+  Copyright (C) 2010 JamesAC, spx
+
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License
+  as published by the Free Software Foundation; either version 2
+  of the License, or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+*/
+
+/*
+Rainmeter query interface based on Window Message
+
+Usage:
+1) Post the query to Rainmeter (E.g. QueryRainmeterSkinsPath function)
+   * target window : Rainmeter(TrayWindow)
+   * message       : WM_QUERY_RAINMETER
+   * wParam        : QUERY ID (RAINMETER_QUERY_ID_XXXXX)
+   * lParam        : window handle which receives WM_COPYDATA
+
+2) Retrieve the data received from Rainmeter, on WM_COPYDATA
+   * COPYDATASTRUCT->dwData : QUERY ID (RAINMETER_QUERY_ID_XXXXX)
+   * COPYDATASTRUCT->lpData : requested string in wide char
+   * COPYDATASTRUCT->cbData : size of lpData
+
+-----
+#include <Windows.h>
+#include <string>
+#include "RainmeterQuery.h"
+
+void QueryRainmeterSkinsPath(HWND hWndSelf)
+{
+	HWND hWndRainmeter = FindWindow(RAINMETER_QUERY_WINDOW_TITLE, RAINMETER_QUERY_WINDOW_CLASS);
+	if (hWndRainmeter)
+	{
+		PostMessage(hWndRainmeter, WM_QUERY_RAINMETER, RAINMETER_QUERY_ID_SKINS_PATH, (LPARAM)hWndSelf);
+	}
+}
+
+LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	switch (message)
+	{
+	case WM_COPYDATA:
+		{
+			COPYDATASTRUCT* cds = (COPYDATASTRUCT*)lParam;
+			
+			// Copy ID and string to local
+			DWORD id = cds->dwData;                       // contains QUERY ID (RAINMETER_QUERY_ID_XXXXX)
+			std::wstring string = (WCHAR*)cds->lpData;    // contains requested string in wide char
+
+			//
+			...
+		}
+		break;
+
+	default:
+		return DefWindowProc(hWnd, message, wParam, lParam);
+	}
+	return 0;
+}
+-----
+*/
+
+#ifndef __RAINMETER_QUERY_H__
+#define __RAINMETER_QUERY_H__
+
+#include <tchar.h>
+
+#define RAINMETER_QUERY_WINDOW_NAME				TEXT("RainmeterTrayClass")
+#define RAINMETER_QUERY_CLASS_NAME				NULL
+
+#define WM_QUERY_RAINMETER						WM_APP + 1000
+
+// QUERY IDs
+#define RAINMETER_QUERY_ID_SKINS_PATH			4101
+#define RAINMETER_QUERY_ID_SETTINGS_PATH		4102
+#define RAINMETER_QUERY_ID_PLUGINS_PATH			4103
+
+#endif

Library/TrayWindow.cpp

@@ -23,6 +23,7 @@
 #include "Rainmeter.h"
 #include "AboutDialog.h"
 #include "Error.h"
+#include "RainmeterQuery.h"
 #include <io.h>
 #include <ShellAPI.h>
 
@@ -620,7 +621,6 @@ LRESULT CALLBACK CTrayWindow::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 		break;
 
 	case WM_QUERY_RAINMETER:
-
 		if (Rainmeter && IsWindow((HWND)lParam))
 		{
 			if(wParam == RAINMETER_QUERY_ID_SKINS_PATH)
@@ -630,7 +630,7 @@ LRESULT CALLBACK CTrayWindow::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 				COPYDATASTRUCT cds;
 			
 				cds.dwData = RAINMETER_QUERY_ID_SKINS_PATH;
-				cds.cbData = (path.size() + 1) * 2;
+				cds.cbData = (path.size() + 1) * sizeof(wchar_t);
 				cds.lpData = (LPVOID) path.c_str();
 
 				SendMessage((HWND)lParam, WM_COPYDATA, (WPARAM)hWnd, (LPARAM)&cds);
@@ -644,7 +644,7 @@ LRESULT CALLBACK CTrayWindow::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 				COPYDATASTRUCT cds;
 			
 				cds.dwData = RAINMETER_QUERY_ID_SETTINGS_PATH;
-				cds.cbData = (path.size() + 1) * 2;
+				cds.cbData = (path.size() + 1) * sizeof(wchar_t);
 				cds.lpData = (LPVOID) path.c_str();
 
 				SendMessage((HWND)lParam, WM_COPYDATA, (WPARAM)hWnd, (LPARAM)&cds);
@@ -658,7 +658,7 @@ LRESULT CALLBACK CTrayWindow::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 				COPYDATASTRUCT cds;
 			
 				cds.dwData = RAINMETER_QUERY_ID_PLUGINS_PATH;
-				cds.cbData = (path.size() + 1) * 2;
+				cds.cbData = (path.size() + 1) * sizeof(wchar_t);
 				cds.lpData = (LPVOID) path.c_str();
 
 				SendMessage((HWND)lParam, WM_COPYDATA, (WPARAM)hWnd, (LPARAM)&cds);

Library/resource.h

@@ -60,13 +60,6 @@
 #define ID_CONTEXT_SKINMENU_MONITOR_AUTOSELECT	4049
 #define ID_CONTEXT_NEW_VERSION				4050
 
-#define WM_QUERY_RAINMETER				WM_APP + 1000
-
-#define RAINMETER_QUERY_ID_SKINS_PATH			4101
-#define RAINMETER_QUERY_ID_SETTINGS_PATH		4102
-#define RAINMETER_QUERY_ID_PLUGINS_PATH			4103
-
-
 #define ID_CONFIG_EDIT                  30000
 #define ID_CONFIG_FIRST                 30001
 #define ID_CONFIG_LAST					33000