从文本框中读取输入

Question

我从第二个文本框中读取数据IDC_MAIN_OUTPUT时遇到问题。我只能显示第一个文本框的内容IDC_MAIN_INPUT。我已经尝试了各种方法来解决但仍然无法解决问题。到目前为止，这是我的代码：

switch (msg)
    {
    case WM_COMMAND:
            switch (LOWORD(wParam))
            {
            case IDC_MAIN_BUTTON:
                char *bufIn, *bufOut;
                int lenIn = GetWindowTextLength(GetDlgItem(hwnd, IDC_MAIN_INPUT));
                int lenOut = GetWindowTextLength(GetDlgItem(hwnd, IDC_MAIN_OUTPUT));
                bufIn = (char*)GlobalAlloc(GPTR, lenIn + 1);
                GetDlgItemText(hwnd, IDC_MAIN_INPUT, bufIn, lenIn + 1);
                bufOut = (char*)GlobalAlloc(GPTR, lenOut + 1);
                GetDlgItemText(hwnd, IDC_MAIN_OUTPUT, bufOut, lenOut + 1);
                MessageBox(NULL, bufIn, "String", NULL);
                MessageBox(NULL, bufOut, "String", NULL);
                //MessageBox(NULL, input, "Title Here", MB_OK);
                mc.application(bufIn, bufOut);
            }
        break;
    case WM_CREATE:
        CreateObjects(hwnd);
        break;
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}