WTL利用CIndirectDialogImpl实现InputBox

Window中VB有InputBox的功能，但SDK、MFC、WTL等并未提供类似功能。

WTL有CIndirectDialogImpl，可以很简单的构建对话框。基于此，实现一个简单的InputBox功能

#define BUF_LEN MAX_PATH

#define IDC_TEXT    (100)

class CInputBox: public CIndirectDialogImpl< CInputBox >
{
private:
    LPCTSTR szPrompt_;
    LPCTSTR szTitle_;
    LPCTSTR szDefaultText_;
    TCHAR   strResult[BUF_LEN];

public:
    BEGIN_DIALOG(0, 0, 257, 62)
        DIALOG_CAPTION(szTitle_ != nullptr ? szTitle_ : _T(""))
        DIALOG_STYLE(DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU)
        DIALOG_FONT(9, _T("SimSun"))
    END_DIALOG()

    BEGIN_CONTROLS_MAP()
        CONTROL_DEFPUSHBUTTON(_T("OK"), IDOK, 200, 11, 50, 14, 0, 0)
        CONTROL_PUSHBUTTON(_T("Cancel"), IDCANCEL, 200, 31, 50, 14, 0, 0)
        CONTROL_LTEXT(szPrompt_ != nullptr ? szPrompt_ : _T("Please input: "), IDC_STATIC, 7, 7, 158, 14, 0, 0)
        CONTROL_EDITTEXT(IDC_TEXT, 7, 31, 180, 14, 0, 0)
    END_CONTROLS_MAP()

    BEGIN_MSG_MAP(CInputBox)
        MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
        COMMAND_ID_HANDLER(IDOK, OnCloseCmd)
        COMMAND_ID_HANDLER(IDCANCEL, OnCloseCmd)
    END_MSG_MAP()

    CInputBox::CInputBox() : szPrompt_(nullptr), szTitle_(nullptr), szDefaultText_(nullptr){
        memset(strResult, 0, sizeof(TCHAR)*BUF_LEN);
    }

    static bool InputBox(LPCTSTR szPrompt, LPTSTR strResult, LPCTSTR szTitle = _T(""), LPCTSTR szDefaultText = _T(""), HWND hParent = nullptr){
        CInputBox dlg;
        dlg.szPrompt_ = szPrompt;
        dlg.szTitle_ = szTitle;
        dlg.szDefaultText_ = szDefaultText;
        if (IDOK == dlg.DoModal(hParent)) {
            // get return string.
            lstrcpyn(strResult, dlg.strResult, BUF_LEN);
            return true;
        }
        return false;
    }

    LRESULT OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
    {
        CenterWindow(GetParent());
        if (szDefaultText_) {
            ::SetWindowText(::GetDlgItem(m_hWnd, IDC_TEXT), szDefaultText_);
        }
        // set focus to edit control item.
        ::SetFocus(::GetDlgItem(m_hWnd, IDC_TEXT));
        // return false to prevent setfocus in dialogproc.
        return false;
    }

    LRESULT OnCloseCmd(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
    {
        if (wID == IDOK) {
            ::GetWindowText(::GetDlgItem(m_hWnd, IDC_TEXT), strResult, BUF_LEN - 1);
        }

        EndDialog(wID);
        return 0;
    }
};

使用类似于如下：

void demo()
{
    TCHAR strPassWd[MAX_PATH];
    if (CInputBox::InputBox(_T("请输入加密密码："), strPassWd, _T("输入密码"))) {
        //
    }

    return ;
}