#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <tchar.h>

LPCTSTR szWindowClass = _T("Mcapture2");
LPCTSTR szTitle       = _T("PassGet Test Program");

HINSTANCE hInst;

ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);

void                OpningPrintString(HWND);
BOOL                GetPasswdWindow(HWND, LPARAM);


int APIENTRY _tWinMain(HINSTANCE hInstance,
                       HINSTANCE hPrevInstance,
                       LPTSTR    lpCmdLine,
                       int       nCmdShow)
{
    MSG msg;

    MyRegisterClass(hInstance);

    if (!InitInstance (hInstance, nCmdShow)) 
    {
        return FALSE;
    }

    BOOL bRet;
    while ((bRet = GetMessage(&msg, NULL, 0, 0)) != 0) 
    {
        if(bRet == -1)
        {
            break;
        }

        if (!TranslateAccelerator(msg.hwnd, NULL, &msg)) 
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX); 

    wcex.style             = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc       = (WNDPROC)WndProc;
    wcex.cbClsExtra        = 0;
    wcex.cbWndExtra        = 0;
    wcex.hInstance         = hInstance;
    wcex.hIcon             = LoadIcon(hInstance, NULL);
    wcex.hCursor           = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground     = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName      = (LPCTSTR)NULL;
    wcex.lpszClassName     = szWindowClass;
    wcex.hIconSm           = LoadIcon(wcex.hInstance, NULL);

    return RegisterClassEx(&wcex);
}



BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance;

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, 600, 200, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}



LRESULT CALLBACK WndProc(HWND hWnd,
                         UINT message,
                         WPARAM wParam, 
                         LPARAM lParam)
{
    switch (message)
    {
    case WM_PAINT:
        OpningPrintString(hWnd);
        break;

    case WM_LBUTTONDOWN:
        SetCapture(hWnd);
        SetCursor(LoadCursor(NULL, IDC_CROSS));
        break;
    
    case WM_LBUTTONUP:
        if( GetPasswdWindow(hWnd, lParam) )
            MessageBox(hWnd, _T("GetPasswdWindow"), _T("Error"), MB_OK);
        ReleaseCapture();
        SetCursor(LoadCursor(NULL, IDC_ARROW));
        break;

    case WM_CLOSE:
        DestroyWindow(hWnd);
        break;
    
    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}



void OpningPrintString(HWND hWnd)
{
    RECT rc;
    GetClientRect(hWnd, &rc);
    rc.left += 40, rc.top += 40, rc.right -= 40, rc.bottom -= 40;

    PAINTSTRUCT paint;
    HDC hdc = BeginPaint(hWnd, &paint);

    DrawText(hdc, _T(
        "このWindow領域をクリックするとマウスカーソルが変わるので、\n"
        "クリックしたまま、パスワードが書かれてある領域に、\n"
        "ドラッグしてください"),
        -1, &rc, DT_WORDBREAK);

    EndPaint(hWnd, &paint);
}



BOOL GetPasswdWindow(HWND hWnd, LPARAM lp)
{
    POINTS pts = MAKEPOINTS(lp);
    POINT pt = { pts.x, pts.y };

    ClientToScreen(hWnd, &pt);
    
    HWND hTarget = WindowFromPoint(pt);
    if(hTarget == NULL)
        return TRUE;

    PostMessage(hTarget, EM_SETPASSWORDCHAR, (WPARAM)0, (LPARAM)0);
    InvalidateRect(hTarget, NULL, TRUE);
    return FALSE;
}