Edit Field Help

This is a discussion on Edit Field Help within the Windows Programming forums, part of the Platform Specific Boards category; Trying to respond to a keyboard "ENTER" keystroke.. from inside of my window.. I would like to assign the contents ...

  1. #1
    VA National Guard The Brain's Avatar
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    Edit Field Help

    Trying to respond to a keyboard "ENTER" keystroke.. from inside of my window.. I would like to assign the contents (if any) of edit field to a global cstring.. and then clear the edit field. Any help would be appreciated.

    Code:
    #include <windows.h>
    
    HINSTANCE hInstGlobal;
    HWND hButton, hEdit;
    char* szCableCount;
    
    void DrawGrid(HDC, int rows, int column);
    
    /*  Declare Windows procedure  */
    LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
    
    /*  Make the class name into a global variable  */
    char szClassName[ ] = "Cable Splicer";
    
    int WINAPI WinMain (HINSTANCE hThisInstance,
                        HINSTANCE hPrevInstance,
                        LPSTR lpszArgument,
                        int nCmdShow)
    
    {
       hInstGlobal = hThisInstance;
                        
                        
        HWND hwnd;               /* This is the handle for our window */
        MSG messages;            /* Here messages to the application are saved */
        WNDCLASSEX wincl;        /* Data structure for the windowclass */
        
     
    
        /* The Window structure */
        wincl.hInstance = hThisInstance;
        wincl.lpszClassName = szClassName;
        wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
        wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
        wincl.cbSize = sizeof (WNDCLASSEX);
    
        /* Use default icon and mouse-pointer */
        wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
        wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
        wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
        wincl.lpszMenuName = NULL;                 /* No menu */
        wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
        wincl.cbWndExtra = 0;                      /* structure or the window instance */
        /* Use Windows's default color as the background of the window */
        wincl.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
    
        /* Register the window class, and if it fails quit the program */
        if (!RegisterClassEx (&wincl))
            return 0;
    
        /* The class is registered, let's create the program*/
        hwnd = CreateWindowEx (
               0,                   /* Extended possibilites for variation */
               szClassName,         /* Classname */
               "Cable Splice Calculator",      /* Title Text */
               WS_OVERLAPPEDWINDOW, /* default window */
               CW_USEDEFAULT,       /* Windows decides the position */
               CW_USEDEFAULT,       /* where the window ends up on the screen */
               544,                 /* The programs width */
               375,                 /* and height in pixels */
               HWND_DESKTOP,        /* The window is a child-window to desktop */
               NULL,                /* No menu */
               hThisInstance,       /* Program Instance handler */
               NULL                 /* No Window Creation data */
               );
    
        /* Make the window visible on the screen */
        ShowWindow (hwnd, nCmdShow);   
        
        UpdateWindow(hwnd);
    
        /* Run the message loop. It will run until GetMessage() returns 0 */
        while (GetMessage (&messages, NULL, 0, 0))
        {
            /* Translate virtual-key messages into character messages */
            TranslateMessage(&messages);
            /* Send message to WindowProcedure */
            DispatchMessage(&messages);
        }
    
        /* The program return-value is 0 - The value that PostQuitMessage() gave */
        return messages.wParam;
    }
    
    
    /*  This function is called by the Windows function DispatchMessage()  */
    
    LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
        switch (message)                  /* handle the messages */
        {
            case WM_CREATE: 
                 
                 hButton = CreateWindow("BUTTON", "ADD", WS_CHILD|WS_VISIBLE|
                                        BS_DEFPUSHBUTTON, 150, 10, 140, 40, 
                                        hwnd, (HMENU) 1, hInstGlobal, NULL);
                                        
                 hEdit = CreateWindow("EDIT", NULL, WS_CHILD|WS_VISIBLE|
                                       WS_BORDER|ES_AUTOHSCROLL, 10, 30, 120, 20,
                                       hwnd, (HMENU) 2, hInstGlobal, NULL);              
                
                 break;
                 
            case WM_PAINT:
                 
                 HDC hdc;
                 PAINTSTRUCT ps;
                               
                 hdc = BeginPaint(hwnd, &ps);
                 TextOut(hdc, 10, 10, "Enter Cable Count:", 18);  
                 DrawGrid(hdc, 1,1);    
                 EndPaint(hwnd, &ps);       
                 
                 break;           
               
            case WM_CHAR:
                 
                 szCableCount = new char[255];       
                 
                 if((char)wParam == '\r')
                 
                      SendMessage(hEdit, WM_GETTEXT, 256, (LPARAM) szCableCount);
                      
                 break;                      
            
            case WM_DESTROY:
                PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
                break;
            default:                      /* for messages that we don't deal with */
                return DefWindowProc (hwnd, message, wParam, lParam);
        }
    
        return 0;
    }
    
    
    
    //Function Definitions
    
    void DrawGrid(HDC hdc, int rows, int column)
    {    
         HPEN hPen;     
                 
         hPen = CreatePen(PS_SOLID, 1, RGB(0,0,0));
         
         SelectObject(hdc, hPen);
         
         Rectangle(hdc, 10, 100, 200, 120);
         
         SelectObject(hdc, hPen);
         
         DeleteObject(hPen);
    }
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
    • "Data Structures and Other Objects using C++" -Walter Savitch
    • "Assembly Language for Intel-Based Computers" -Kip Irvine
    • "Programming Windows, 5th edition" -Charles Petzold
    • "Visual C++ MFC Programming by Example" -John E. Swanke
    • "Network Programming Windows" -Jones/Ohlund
    • "Sams Teach Yourself Game Programming in 24 Hours" -Michael Morrison
    • "Mathmatics for 3D Game Programming & Computer Graphics" -Eric Lengyel

  2. #2
    Registered User
    Join Date
    Sep 2004
    Posts
    57
    If I understand you, see "Edit":
    http://www.winprog.org/tutorial/controls.html

    Below is the pertinent part:

    Here is the code used to interface with the edit control in this example:

    Code:
        SetDlgItemText(hwnd, IDC_TEXT, "This is a string");
    That's all it takes to change the text contained in the control (this can be used for pretty much any control that has a text value associated with it, STATICs, BUTTONs and so on).

    Retreiving the text from the control is easy as well, although slightly more work than setting it...

    Code:
        int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_TEXT));
        if(len > 0)
        {
            int i;
            char* buf;
    
            buf = (char*)GlobalAlloc(GPTR, len + 1);
            GetDlgItemText(hwnd, IDC_TEXT, buf, len + 1);
    
            //... do stuff with text ...
    
            GlobalFree((HANDLE)buf);
        }

  3. #3
    VA National Guard The Brain's Avatar
    Join Date
    May 2004
    Location
    Manassas, VA USA
    Posts
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    awesome link.. that list box is even better than what I was trying to use..
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
    • "Data Structures and Other Objects using C++" -Walter Savitch
    • "Assembly Language for Intel-Based Computers" -Kip Irvine
    • "Programming Windows, 5th edition" -Charles Petzold
    • "Visual C++ MFC Programming by Example" -John E. Swanke
    • "Network Programming Windows" -Jones/Ohlund
    • "Sams Teach Yourself Game Programming in 24 Hours" -Michael Morrison
    • "Mathmatics for 3D Game Programming & Computer Graphics" -Eric Lengyel

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