ReinterpretCodepage.cpp

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

//--------------------------------------------------------------------------------

HINSTANCE   hInst;

#define     N 512

wchar_t     wstr[N];
char        utf8[N*2];

HWND        ourWnd    = NULL,
            foobarWnd = NULL;

//--------------------------------------------------------------------------------
BOOL CALLBACK EnumWindowsProc(__in HWND hwnd, __in LPARAM lParam)
{
   int count = GetWindowText(hwnd, wstr, N);

   if(hwnd == ourWnd
   ||   wcsstr(wstr, L"[foobar2000 v") == NULL)
      return TRUE;

   foobarWnd = hwnd;
   return FALSE;
}

//--------------------------------------------------------------------------------
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
   switch (message)
   {
   case WM_DESTROY:
      hWnd = NULL;
   case WM_CLOSE:
      PostQuitMessage(0);
      break;

   default:
      return DefWindowProc(hWnd, message, wParam, lParam);
   }

   return 0;
}


//--------------------------------------------------------------------------------
void MainFunction()
{
// Find foobar2000 window if necessary.
   if(foobarWnd == NULL)
      EnumWindows(&EnumWindowsProc, NULL);

//----
// Get wide character string (UTF-16)
   if(GetWindowText(foobarWnd, wstr, N) == 0)
      EnumWindows(&EnumWindowsProc, NULL);

//----
// Convert to UTF-8
   WideCharToMultiByte(CP_UTF8, 0, wstr, -1, utf8, 2*N, NULL, NULL);

//----
// Display byte stream
   SetWindowTextA(ourWnd, utf8);
}



//--------------------------------------------------------------------------------
BOOL SetupWindow()
{
   WNDCLASSEX wcex;

   wcex.cbSize = sizeof(WNDCLASSEX);

   wcex.style               = 0;
   wcex.lpfnWndProc     = WndProc;
   wcex.cbClsExtra      = 0;
   wcex.cbWndExtra      = 0;
   wcex.hInstance           = hInst;
   wcex.hIcon               = LoadIcon(NULL, IDI_APPLICATION);
   wcex.hCursor         = LoadCursor(NULL, IDC_ARROW);
   wcex.hbrBackground   = (HBRUSH)(COLOR_WINDOW+1);
   wcex.lpszMenuName        = NULL;
   wcex.lpszClassName   = L"UTF-8 Converter";
   wcex.hIconSm         = NULL;

   RegisterClassEx(&wcex);

   ourWnd = CreateWindow(L"UTF-8 Converter", L"Can't find foobar2000 window...", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInst, NULL);

   if(!ourWnd)
      return FALSE;

   RECT r;
   GetWindowRect    (ourWnd, &r);
   MoveWindow       (ourWnd, r.left, r.top, 640, 0, FALSE);
   ShowWindow       (ourWnd, SW_SHOW);
   UpdateWindow (ourWnd);

   return TRUE;
}




//--------------------------------------------------------------------------------
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// Store instance handle in our global variable
   hInst = hInstance;

   MSG msg;

// application initialization
   if(!SetupWindow())
      return FALSE;

// Main loop
   while(true)
   {
      if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
      {
         if(msg.message == WM_QUIT)
            break;
         TranslateMessage(&msg);
         DispatchMessage(&msg);
      }

      MainFunction();
      Sleep(10);
   }

   return msg.wParam;
}