VC-文本框只能输入数字与小数 源文件.docVIP

VC-文本框只能输入数字和小数?源文件 #include stdafx.h#include NumberEdit.h CNumberEdit::CNumberEdit(){?m_iAfterDotLen = 2;?m_str = _T(0);} CNumberEdit::~CNumberEdit(){} BEGIN_MESSAGE_MAP(CNumberEdit, CEdit)?//{{AFX_MSG_MAP(CNumberEdit)?ON_WM_CHAR()?ON_CONTROL_REFLECT(EN_KILLFOCUS, OnKillfocus)?//}}AFX_MSG_MAPEND_MESSAGE_MAP() void CNumberEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) {?// 修改消息响应?if(nChar == 8)?{??//退格??CEdit::OnChar(nChar, nRepCnt, nFlags);??return;?}?BOOL bChange = FALSE;?GetWindowText(m_str);?if(CheckNumber(nChar,nRepCnt,nFlags))?{??//检查输入为数字??bChange = TRUE;?}?else if(CheckOneMinus(nChar,nRepCnt,nFlags))?{??//检查只有一个负号,且只能是第一个字符??bChange = TRUE;?}?else if(CheckOneDot(nChar,nRepCnt,nFlags))?{??//检查只有一个小数点??bChange = TRUE;?}?if(bChange)?{??CEdit::OnChar(nChar, nRepCnt, nFlags);?}} void CNumberEdit::OnKillfocus() {?// 修改消息响应?//失去焦点时，小数按设置的小数点后数据长度补齐?GetWindowText(m_str);?if(m_str.IsEmpty())? ?{??//未输入数据则设为0??m_str = 0;?}?else if(m_str.GetLength() == 1 m_str[0] == TCHAR(-))?{??//只输入了一个负号??m_str = 0;?}?else?{??int iDotPos = m_str.Find(TCHAR(.));??if(iDotPos 0)??{???//没有找到小数点???SetWindowText(m_str);???return;??}??if(iDotPos 0)??{???//小数点后已有位数???int iLen = m_str.GetLength() - 1 - iDotPos;???if(iLen = m_iAfterDotLen)???{????//已有位数超过设定????return;???}???if (iLen == 0)???{????//小数点后没有数据则用0补齐????m_str+=0;???}??}?}?SetWindowText(m_str);} BOOL CNumberEdit::CheckNumber(UINT nChar,UINT nRepCnt,UINT nFlags){?if(::isdigit(nChar)==0)?{??//是否数字??return FALSE;?}?//小数点位置?int iDotPos = m_str.Find(TCHAR(.));?if(iDotPos = 0)?{??//小数据点后数据长度??int iLen = m_str.GetLength() - 1 - iDotPos;??if( (GetCaretXPos() = iDotPos) (iLen = m_iAfterDotLen))??{???//超过设置的长度???return FALSE;??}?}?return TRUE;} BOOL CNumberEdit::CheckOneMinus(UINT nChar,UINT nRepCnt,UINT nFlags){?if(nChar != -)?{??//不是-??return FALSE;?}?if(GetCaretXPos() != 0)?{??//不在第一个位置??return FALSE;?}?if(!m_str.IsEmpty