Stop text overwrting in a edit box

[gaar321]

Hello

could you please help me on how i could stop text overwriting in a edit box when SendMessage() is used for example: case ID_B0 which holds the value 0 how could you keep that in the edit box if you then pressed the button ID_B1 which holds the value 1

[zaryk]

   if editbox_text == ""
      
      case id_b0:
         editbox_text = "0"

      case id_b1:
         editbox_text = "1"

[gaar321]

Sorry to be annoying but this doesnt make sence to me

[Igor Vartanov]

The same to your original explanation.

What does "overwriting" means? You press "0" button, your edit box receives "0", then you press "1", your edit box should eventually contain what? "1"? or "01"? or "10"?

[gaar321]

Yeah thats it i want in to contain 10 but when you press one or the other they overwrite eachother

[MrViggy]

You either need to store the data in the text box in a variable in your class, or before you update the box (after a button has been pressed), you read the text out of the box; append the new data; update the text box.

Viggy

[gaar321]

Im sorry but i follow example better could you please give me a snippet

thanks in advance

[Paul McKenzie]

Im sorry but i follow example better could you please give me a snippet

1) Get the data from the text box.

2) Concatenate that data onto a string that you have stored somewhere (I don't care where -- you know this, not us).

3) Update the text box with this string.

So what don't you understand?

Regards,

Paul McKenzie

[gaar321]

Yes i understand storing it but how do i update with 0 and 1 together?

[Igor Vartanov]

Look, your edit box holds the string. You want to append another character to a string. This is called concatenation. You get the string from edit box, append corresponding character to it and update the edit box content with the resultant string.

[Paul McKenzie]

Yes i understand storing it but how do i update with 0 and 1 together?

Do you know what concatenation is? If so, do you know how to change what's in a text box programatically? If so, then what are you having trouble with?

Regards,

Paul McKenzie

[gaar321]

I am using Edit_SetText and Edit_GetText put i dont know how to Concatenate a char and a string.

[Paul McKenzie]

I am using Edit_SetText and Edit_GetText put i dont know how to Concatenate a char and a string.

What is "Edit_SetText" and "Edit_GetText"? Those are not Windows API functions.

Secondly, how did you get as far as writing any program that deals with strings? Are you cherry-picking examples off the web, without learning the tools (i.e. the language) used to create such programs? You are not going to get far using that approach to learn.

#include <string>
#include <iostream>

using namespace std;

int main()
{
    string s = "0";
    string s1 = "1";

   // concatenation
    s += s1;
    cout << s;  // this will print "01" on the console
}

Regards,

Paul McKenzie

[gaar321]

Right okay this is starting to make sence i know how to do concatenation.

What i am coding is nothing to with a console app.

I am trying to apply 10 in a win app e.g.

// Calc.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "Calc.h"
#include <Richedit.h>

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;								// current instance
TCHAR szTitle[MAX_LOADSTRING];					// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];			// the main window class name
HWND Box;
HWND B0;
HWND B1;
// Forward declarations of functions included in this code module:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

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

 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_CALC, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow))
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_CALC));

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0))
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage are only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);

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

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;
   
   hInst = hInstance; // Store instance handle in our global variable


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

   




   Box = CreateWindow("edit","",                                 // Default text.
                               WS_VISIBLE | WS_CHILD | SS_RIGHT, // the styles
                               100,100,                                      // the left and top co-ordinates
                               100,100,                                  // width and height
                               hWnd,                                     // parent window handle
                               (HMENU)ID_EDIT,                         // the ID of your combobox
                               hInstance,                                // the instance of your application
                               NULL
                            );
   B0 = CreateWindow("button","0",WS_VISIBLE | WS_CHILD | WS_BORDER, // the styles
                               50,50,                                      // the left and top co-ordinates
                               20,20,                                  // width and height
                               hWnd,                                     // parent window handle
                               (HMENU)ID_B0,                         // the ID of your combobox
                               hInstance,                                // the instance of your application
                               NULL
                            );
    B1 = CreateWindow("button","1",WS_VISIBLE | WS_CHILD | WS_BORDER, // the styles
                               300,300,                                      // the left and top co-ordinates
                               20,20,                                  // width and height
                               hWnd,                                     // parent window handle
                               (HMENU)ID_B1,                         // the ID of your combobox
                               hInstance,                                // the instance of your application
                               NULL
                            );

   if (!hWnd)
   {
      return FALSE;
   }
  

   Edit_SetReadOnly(Box,TRUE);

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

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;

	switch (message)
	{
	case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// Parse the menu selections:
		switch (wmId)
		{
		case IDM_ABOUT:
			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
			break;
		case IDM_EXIT:
			DestroyWindow(hWnd);
			break;
		case ID_B0:
	
			Edit_SetText(Box,"0");
			
		
			
			break;
		case ID_B1:
			Edit_SetText(Box,"1");

			break;


		

		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		// TODO: Add any drawing code here...
		EndPaint(hWnd, &ps);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	UNREFERENCED_PARAMETER(lParam);
	switch (message)
	{
	case WM_INITDIALOG:
		return (INT_PTR)TRUE;

	case WM_COMMAND:
		if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
		{
			EndDialog(hDlg, LOWORD(wParam));
			return (INT_PTR)TRUE;
		}
		break;
	}
	return (INT_PTR)FALSE;
}

[gaar321]

I think i have posted this is the wrong place should this be in VC++ because thats what i am using???