将文本字段中的值存储在.txt中

Question

My problem is very simple (at least i think it is). I'd like to capture a value from a text input and store it inside a txt file. Right now i'm using this code, and the action button is intended to write the content in file when clicked. But i'm getting the value of button registered in the file instead.

    case WM_CREATE:{
        CreateWindow(
            TEXT("EDIT"), TEXT("value"), 
            WS_VISIBLE | WS_CHILD | WS_BORDER, 
            190, 50, 50, 20,
            hwnd, (HMENU) NULL, NULL, NULL 
        );

        CreateWindow(
            TEXT("BUTTON"), TEXT("Ok"), 
            WS_VISIBLE | WS_CHILD, 
            250, 10, 30, 20,
            hwnd, (HMENU) ID_BTN, NULL, NULL 
        );

        break;
    }

    case WM_COMMAND: {
        if (LOWORD(wParam) == ID_BTN) {
            std::ofstream outfile;
            outfile.open("C:\\file.txt", std::ios_base::app);
            outfile << ID_BTN;
            outfile.close();
            MessageBox(hwnd, "Done!", "Title", MB_ICONINFORMATION);
              return 0;
         }
         break;
    }

Thanks.

---

EDIT : @ZanLynx, I tried to do what you have said, but compiler keep saying hwndText wasn't declared, when it was.

107 `hwndText' undeclared (first use this function)

Here's the code

#define ID_BTN 1
#define ID_TXT 2

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
        case WM_CREATE:
        {

            HWND hwndText = CreateWindow(
                TEXT("Edit"), TEXT("Write here"), 
                WS_VISIBLE | WS_CHILD | WS_BORDER | ES_AUTOHSCROLL | ES_AUTOVSCROLL,  
                190, 10, 100, 20, 
                hwnd, (HMENU) ID_TXT, NULL, NULL
            );

            CreateWindow(
                TEXT("BUTTON"), TEXT("OK"), 
                WS_VISIBLE | WS_CHILD, 
                250, 10, 30, 20,
                hwnd, (HMENU) ID_BTN, NULL, NULL
            );

            break;
        }

        case WM_COMMAND: 
        {

            if (LOWORD(wParam) == ID_BTN) 
            {
                LRESULT iTextSize = SendMessage(hwndText, EM_GETLIMITTEXT, 0, 0);
                char *szText = new char[iTextSize];
                SendMessage(hwndText, WM_GETTEXT, iTextSize, (LPARAM)szText);

                std::ofstream outfile;
                outfile.open("C:\\f.txt", std::ios_base::app);
                outfile << szText;
                outfile.close();

                MessageBox(hwnd, "Done!", "Title", MB_ICONINFORMATION);
                return 0;
            };  

            break;
        }

        case WM_DESTROY:
            PostQuitMessage (0);
            break;

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

    return 0;
}

Answer 1

Store the handle to your EDIT window.

Then you can use the Edit Control functions to get the text so you can write it into a file.