1 files changed, 61 insertions, 0 deletions
diff --git a/shared/dll_loader.cpp b/shared/dll_loader.cpp
new file mode 100644
index 00000000..6aa48fd7
--- /dev/null
+++ b/shared/dll_loader.cpp
@@ -0,0 +1,61 @@
+// **************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
+// * Copyright (C) 2008-2010 ZenJu (zhnmju123 AT gmx.de)                    *
+// **************************************************************************
+//
+#include "dll_loader.h"
+#include <wx/msw/wrapwin.h> //includes "windows.h"
+#include <map>
+#include <cassert>
+
+namespace
+{
+class DllHandler //dynamically load "kernel32.dll"
+{
+public:
+    static DllHandler& getInstance()
+    {
+        static DllHandler instance;
+        return instance;
+    }
+
+    HINSTANCE getHandle(const std::wstring& libraryName)
+    {
+        HandleMap::const_iterator foundEntry = handles.find(libraryName);
+        if (foundEntry == handles.end())
+        {
+            HINSTANCE newHandle = ::LoadLibrary(libraryName.c_str());
+            if (newHandle != NULL)
+                handles.insert(std::make_pair(libraryName, newHandle));
+
+            return newHandle;
+        }
+        else
+            return foundEntry->second;
+    }
+
+private:
+    DllHandler() {}
+
+    ~DllHandler()
+    {
+        for (HandleMap::const_iterator i = handles.begin(); i != handles.end(); ++i)
+            ::FreeLibrary(i->second);
+    }
+
+    typedef std::map<std::wstring, HINSTANCE> HandleMap;
+    HandleMap handles; //only valid handles here!
+};
+}
+
+
+void* util::loadSymbol(const std::wstring& libraryName, const std::string& functionName)
+{
+    const HINSTANCE libHandle = DllHandler::getInstance().getHandle(libraryName);
+
+    if (libHandle != NULL)
+        return reinterpret_cast<void*>(::GetProcAddress(libHandle, functionName.c_str()));
+    else
+        return NULL;
+}