diff --git a/progress.cpp b/progress.cpp
index c1dbeec..7a821c1 100644
--- a/progress.cpp
+++ b/progress.cpp
@@ -1,6 +1,10 @@
 #include "progress.hpp"
+
+#ifndef GUI
+
 #include <iostream>
-#include <stdio.h>
+
+#endif
 
 #ifdef _WIN32
 
@@ -9,35 +13,39 @@
 #include <winuser.h>
 
 #define cout std::wcout
-using string = std::wstring;
 
 #else // UNIX
 
+#ifdef GUI
+#include "progresswindow.hpp"
+#endif // GUI
+
 #include <sys/ioctl.h>
 
 #define cout std::cout
 #define TEXT( a ) a
-using string = std::string;
 
 #endif // UNIX
 
-#ifdef WIN32
+#ifndef GUI // Don't need terminal specific functions in GUI
+
+#ifdef _WIN32
 size_t getTermWidth() {
     CONSOLE_SCREEN_BUFFER_INFO csbi;
 
     GetConsoleScreenBufferInfo( GetStdHandle( STD_OUTPUT_HANDLE ), &csbi );
     return csbi.srWindow.Right - csbi.srWindow.Left + 1;
 }
-#else
+#else  // UNIX
 size_t getTermWidth() {
     struct winsize w;
     ioctl( 0, TIOCGWINSZ, &w );
 
     return w.ws_col;
 }
-#endif
+#endif // UNIX
 
-#ifdef WIN32
+#ifdef _WIN32
 void home( size_t /*UNUSED*/ ) {
     static HANDLE h = NULL;
     while ( !h )
@@ -47,16 +55,19 @@ void home( size_t /*UNUSED*/ ) {
     COORD c = { 0, info.dwCursorPosition.Y - 1 };
     SetConsoleCursorPosition( h, c );
 }
-#else
+#else  // UNIX
 void home( size_t width ) {
     cout << "\x1b[" << width << "D";
 }
-#endif
+#endif // UNIX
+
+#endif // not GUI
 
 size_t getNum( size_t width, int perc ) {
     return ( width * perc ) / 100;
 }
 
+#ifndef GUI
 void ProgressBar::print( int perc ) {
     auto width = getTermWidth();
     home( width );
@@ -75,3 +86,38 @@ void ProgressBar::print( int perc ) {
         cout << " ";
     cout << perc << "%" << std::flush;
 }
+
+void ProgressBar::print( const string &t ) {
+    cout << t << std::endl;
+#ifdef _WIN32
+    cout << std::endl;
+#endif
+}
+
+#else // GUI
+
+void ProgressBar::print( int perc ) {
+#ifndef _WIN32
+    static_cast< ProgressWindow * >( ptr )->setPerc( perc );
+#else
+    PostMessage( ptr, WM_APP, 0, perc );
+#endif
+}
+
+void ProgressBar::print( const string &t ) {
+#ifndef _WIN32
+    static_cast< ProgressWindow * >( ptr )->setLabel( t );
+#else
+    PostMessage( ptr, WM_APP, 1, ( LPARAM )t.c_str() );
+#endif
+}
+
+ProgressBar::~ProgressBar() {
+#ifndef _WIN32
+    static_cast< ProgressWindow * >( ptr )->~ProgressWindow();
+#else
+    PostMessageW( ptr, WM_APP, 2, 0 );
+#endif
+}
+
+#endif // GUI
diff --git a/progress.hpp b/progress.hpp
index f7f92ba..c8e4673 100644
--- a/progress.hpp
+++ b/progress.hpp
@@ -1,8 +1,38 @@
 #ifndef PROGRESS_HPP
 #define PROGRESS_HPP
 
-namespace ProgressBar {
-void print(int perc);
+#include <string>
+
+#ifdef _WIN32
+#include <Windows.h>
+using string = std::wstring;
+#else
+using string = std::string;
+#endif
+
+class ProgressBar {
+public:
+#ifndef GUI
+    ProgressBar() = default;
+    ~ProgressBar() = default;
+#else
+#ifndef _WIN32
+    ProgressBar( void *pw ) : ptr( pw ){};
+#else
+    ProgressBasr( void *hwnd_in ) {
+        while ( *hwnd_in == nullptr )
+            sleep( 50 );
+        ptr = *hwnd_in;
+    };
+#endif // _WIN32
+    ~ProgressBar();
+#endif // GUI
+    void print( int perc );
+    void print( const string &t );
+#ifdef GUI
+private:
+    void *ptr;
+#endif
 };
 
 #endif