added SharedLibrary::setSearchPath()

Foundation/include/Poco/SharedLibrary.h

@@ -122,6 +122,16 @@ public:
 		/// (e.g., "d.so", "d.dll") unless the library has
 		/// been compiled with -DPOCO_NO_SHARED_LIBRARY_DEBUG_SUFFIX.
 
+	static bool setSearchPath(const std::string& path);
+		/// Adds the given path to the list of paths shared libraries
+		/// are searched in.
+		///
+		/// Returns true if the path was set, otherwise false.
+		///
+		/// Currently only supported on Windows, where it calls
+		/// SetDllDirectory(). On all other platforms, does not
+		/// do anything and returns false.
+
 private:
 	SharedLibrary(const SharedLibrary&);
 	SharedLibrary& operator = (const SharedLibrary&);

Foundation/include/Poco/SharedLibrary_HPUX.h

@@ -37,6 +37,7 @@ protected:
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
 	static std::string suffixImpl();
+	static bool setSearchPathImpl(const std::string& path);
 
 private:
 	std::string _path;

Foundation/include/Poco/SharedLibrary_UNIX.h

@@ -42,6 +42,7 @@ protected:
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
 	static std::string suffixImpl();
+	static bool setSearchPathImpl(const std::string& path);
 
 private:
 	std::string _path;

Foundation/include/Poco/SharedLibrary_VX.h

@@ -37,6 +37,7 @@ protected:
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
 	static std::string suffixImpl();
+	static bool setSearchPathImpl(const std::string& path);
 
 private:
 	std::string _path;

Foundation/include/Poco/SharedLibrary_WIN32.h

@@ -36,6 +36,7 @@ protected:
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
 	static std::string suffixImpl();
+	static bool setSearchPathImpl(const std::string& path);
 
 private:
 	std::string _path;

Foundation/include/Poco/SharedLibrary_WIN32U.h

@@ -36,6 +36,7 @@ protected:
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
 	static std::string suffixImpl();
+	static bool setSearchPathImpl(const std::string& path);
 
 private:
 	std::string _path;

Foundation/src/SharedLibrary.cpp

@@ -106,4 +106,10 @@ std::string SharedLibrary::suffix()
 }
 
 
+bool SharedLibrary::setSearchPath(const std::string& path)
+{
+	return setSearchPathImpl(path);
+}
+
+
 } // namespace Poco

Foundation/src/SharedLibrary_HPUX.cpp

@@ -91,4 +91,10 @@ std::string SharedLibraryImpl::suffixImpl()
 }
 
 
+bool SharedLibraryImpl::setSearchPathImpl(const std::string&)
+{
+	return false;
+}
+
+
 } // namespace Poco

Foundation/src/SharedLibrary_UNIX.cpp

@@ -127,4 +127,10 @@ std::string SharedLibraryImpl::suffixImpl()
 }
 
 
+bool SharedLibraryImpl::setSearchPathImpl(const std::string&)
+{
+	return false;
+}
+
+
 } // namespace Poco

Foundation/src/SharedLibrary_VX.cpp

@@ -132,4 +132,10 @@ std::string SharedLibraryImpl::suffixImpl()
 }
 
 
+bool SharedLibraryImpl::setSearchPathImpl(const std::string&)
+{
+	return false;
+}
+
+
 } // namespace Poco

Foundation/src/SharedLibrary_WIN32.cpp

@@ -95,4 +95,14 @@ std::string SharedLibraryImpl::suffixImpl()
 }
 
 
+bool SharedLibraryImpl::setSearchPathImpl(const std::string& path)
+{
+#if _WIN32_WINNT >= 0x0502
+	return SetDllDirectoryA(path.c_str()) != 0;
+#else
+	return false;
+#endif
+}
+
+
 } // namespace Poco

Foundation/src/SharedLibrary_WIN32U.cpp

@@ -106,4 +106,16 @@ std::string SharedLibraryImpl::suffixImpl()
 }
 
 
+bool SharedLibraryImpl::setSearchPathImpl(const std::string& path)
+{
+#if _WIN32_WINNT >= 0x0502
+	std::wstring wpath;
+	Poco::UnicodeConverter::toUTF16(path, wpath);
+	return SetDllDirectoryW(wpath.c_str()) != 0;
+#else
+	return false;
+#endif
+}
+
+
 } // namespace Poco