Edit Field Help

[The Brain]

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.

#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);
}

[cdave]

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:

    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...

    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);
    }

[The Brain]

awesome link.. that list box is even better than what I was trying to use..