动态创建的按钮不会显示在mfc中

Question

So I have this code

CButton details;
details.Create(_T("details"),WS_CHILD|WS_VISIBLE|WS_TABSTOP|BS_PUSHBUTTON,CRect(120,100,100,30), this, 15000);

but it doesn't do anything(created button is not visible after creating it). What am I missing?

EDIT: The code is in a dialog based application's OnInitDialog function. What it should do is to display the button.

Answer 1

Your CButton is created with automatic storage duration. So it is destroyed when OnInitDialog returns. (Which is before the dialog is visible.) Make the CButton a member variable instead.

Answer 2

您提供的CRect下的值不正确，必须是CRect(120, 100, 220, 130) 。

Answer 3

this is depending to declaring CButton details; ! you must declare CButton details; as general instance(not local instance)

define your CButton details; instance as general, so your problem will solved! bellow code work 100 percentage :

#define BBB 10000
CButton c;
void CThreadsDlg::OnBnClickedButton1()
{
    bool a = c.Create(_T("new button"), WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON, CRect(100, 100, 220, 230), this, BBB);
}

if c button created, a variable will be true .

Answer 4

My experience: nothing is shown if your dialog is inherited from CDHtmlDialog, but works OK with normal CDialog. So change the first line in OnInitDialog()

//CDHtmlDialog::OnInitDialog();
CDialog::OnInitDialog();

and of course, the button variable should be global or class member, not local.