CSpinButtonCtrl::GetPos()和GetPos32( )两个函数的用法ParametersReturn ValueRemarksRequirements

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我是靠谱客的博主饱满樱桃，最近开发中收集的这篇文章主要介绍CSpinButtonCtrl::GetPos()和GetPos32( )两个函数的用法ParametersReturn ValueRemarksRequirements，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

CSpinButtonCtrl::GetPos()和GetPos32( )两个函数的用法

今天写了一个程序，里面的结果有点意思，在BOOL Cex06aDlg::OnInitDialog()中，使用了spinbutton控件

设置如下：

CSpinButtonCtrl *pSpin = (CSpinButtonCtrl *)GetDlgItem(IDC_SPIN1);
pSpin->SetRange(0, 100);
pSpin->SetPos(25);

//m_strMyedit = _T("25"); //.Format()
m_strMyedit.Format( _T("%3.1lf"), (double)pSpin->GetPos());
SetDlgItemText(IDC_BUDDY_SPIN1, m_strMyedit);

显示在文本编辑框里面的居然不是25.0，我之后还有一个消息函数，也是点击spinbutton控件来实现文本编辑诓的变化，如下：

void Cex06aDlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
// TODO: Add your message handler code here and/or call default

if (nSBCode == SB_ENDSCROLL)
  return;
if (pScrollBar->GetDlgCtrlID() == IDC_SPIN1) {
  CSpinButtonCtrl *pSpin = (CSpinButtonCtrl *)pScrollBar;
  m_strMyedit.Format(_T("%3.1lf"), double(pSpin->GetPos()) );
  SetDlgItemText(IDC_BUDDY_SPIN1, m_strMyedit);
}

CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
}

结果都是从62256.0开始变化奇怪了，于是我便查msdn，关于这个函数的使用：

Retrieves the current position of a spin button control.


int GetPos( ) const; int GetPos32( LPBOOL lpbError = NULL ) const;

Parameters

lpbError

A pointer to a boolean value that is set to zero if the value is successfully retrieved or non-zero if an error occurs. If this parameter is set to NULL, errors are not reported.

Return Value

The first version returns the 16-bit current position in the low-order word. The high-order word is nonzero if an error occurred.

The second version returns the 32-bit position.

Remarks

When it processes the value returned, the control updates its current position based on the caption of the buddy window. The control returns an error if there is no buddy window or if the caption specifies an invalid or out-of-range value.