//input.rc:

#include <windows.h>
#include "input.h"

DWINDOW DIALOG 80, 60, 110, 80
STYLE DS_MODALFRAME

CAPTION "Input of A and B"
  {
    LTEXT, "Number A:", -1, 10, 10, 30, 12
    EDITTEXT ID_A, 40 10, 50, 12
    LTEXT, "Number B:", -1, 10, 30, 30, 12
    EDITTEXT ID_B, 40, 30, 50, 12
    DEFPUSHBUTTON "OK", ID_OK, 15, 60, 30, 15
    PUSHBUTTON "Cancel", ID_CANCEL, 65, 60, 30, 15
  }

DWINDOW DIALOG 80, 60, 110, 80

EDITTEXT ID_A, 40 10, 50, 12
EDITTEXT ID_B, 40, 30, 50, 12

DEFPUSHBUTTON "OK", ID_OK, 15, 60, 30, 15
PUSHBUTTON "Cancel", ID_CANCEL, 65, 60, 30, 15

LTEXT, "Number A:", -1, 10, 10, 30, 12
(LTEXT, title, idNumber, X, Y, Width, Height)

STYLE DS_MODALFRAME

//input.h:

#define ID_A 1001
#define ID_B 1002
#define ID_OK 1003
#define ID_CANCEL 1004

// function that handles dialogbox messages
BOOL CALLBACK InputProc(HWND hDlg, UINT iMsg, 
                        WPARAM wParam, LPARAM lParam);

//input.cpp: Demonstration of input
//   link with win.obj and resource-script-file input.rc

#include <stdio.h>
#include "win.h"
#include "input.h"

static win *pWin;
static float a, b;


int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, 
                    PSTR szCmdLine, int iCmdShow)
  { 
    win w(hInstance, iCmdShow, "input", 
          "input: Press the leftmousebutton");
    pWin = &w;
    return w.result();
  }


LRESULT CALLBACK WndProc (HWND hWnd, UINT iMsg, 
                          WPARAM wParam, LPARAM lParam)
  { 
    switch (iMsg)
      { 
        case WM_SIZE:
        case WM_LBUTTONDOWN:
          { 
            int n = DialogBox (pWin->hInstance, "DWINDOW",
                               hWnd, InputProc);
            if (n == 2)
              { 
                char buf[30];
                sprintf(buf, "A + B equals %g.", a + b);
                HDC hDC = GetDC(hWnd);
                TextOut(hDC, 20, 20, buf, strlen(buf));
                ReleaseDC(hWnd, hDC);
              } 
            else
              if (n >= 0)
                MessageBox(hWnd, "Bad input", "Error",
                           MB_OK | MB_ICONSTOP);
            return 0;
          }

        case WM_DESTROY:
             PostQuitMessage(0);
             return 0;
      }     

    return DefWindowProc(hWnd, iMsg, wParam, lParam);
  }



BOOL CALLBACK InputProc(HWND hDlg, UINT iMsg, 
                        WPARAM wParam, LPARAM lParam)
  { 
    switch(iMsg)
      { 
        case WM_INITDIALOG:
             SetFocus(GetDlgItem(hDlg, ID_A));
             return FALSE;
        case WM_COMMAND:
             switch (LOWORD(wParam))
               { 
                 case ID_OK:
                   { 
                     char buffer[16];
                     int nGood;
                     GetDlgItemText(hDlg, ID_A, buffer, 15);
                     nGood = (sscanf(buffer, "%f", &a) == 1);
                     GetDlgItemText(hDlg, ID_B, buffer, 15);
                     nGood += (sscanf(buffer, "%f", &b) == 1);
                     EndDialog (hDlg, nGood);
                     return TRUE;
                   }
                 case ID_CANCEL:
                      EndDialog(hDlg, -1);
                      return TRUE;
               }
            break;
      }

   return FALSE;
 }

static win *pWin;
.
.
.
pWin = &w;

case WM_SIZE:
     case WM_LBUTTONDOWN:
       { 
         int n = DialogBox (pWin->hInstance, "DWINDOW",
                            hWnd, InputProc);
         if (n == 2)
           { 
             char buf[30];
             sprintf(buf, "A + B equals %g.", a + b);
             HDC hDC = GetDC(hWnd);
             TextOut(hDC, 20, 20, buf, strlen(buf));
             ReleaseDC(hWnd, hDC);
           } 
         else 
           if (n >= 0)
             MessageBox(hWnd, "Bad input", "Error",
                        MB_OK | MB_ICONSTOP);
         return 0;
      }

HDC hDC = GetDC(hWnd);
.
.
.
ReleaseDC(hWnd, hDC);

MessageBox(hWnd, "Bad input", "Error", MB_OK | MB_ICONSTOP);

return 0;

case WM_COMMAND:
     switch (LOWORD(wParam))
       { 
         case ID_OK:
           { 
             char buffer[16];
             int nGood;
             GetDlgItemText(hDlg, ID_A, buffer, 15);
             nGood = (sscanf(buffer, "%f", &a) == 1);
             GetDlgItemText(hDlg, ID_B, buffer, 15);
             nGood += (sscanf(buffer, "%f", &b) == 1);
             EndDialog (hDlg, nGood);
             return TRUE;
           }
         case ID_CANCEL:
              EndDialog(hDlg, -1);
              return TRUE;
      }

EndDialog(hDlg, nGood)