头文件（NumEdit.h）代码：
#pragma once class CNumEdit : public CEdit { DECLARE_DYNAMIC(CNumEdit) public: CNumEdit(); virtual ~CNumEdit(); protected: DECLARE_MESSAGE_MAP() public: afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags); afx_msg HBRUSH CtlColor(CDC* /*pDC*/, UINT /*nCtlColor*/); }; 源文件（NumEdit.cpp）代码： #include "stdafx.h" #include "NumEdit.h" IMPLEMENT_DYNAMIC(CNumEdit, CEdit) CNumEdit::CNumEdit() { } CNumEdit::~CNumEdit() { } BEGIN_MESSAGE_MAP(CNumEdit, CEdit) ON_WM_CHAR() ON_WM_CTLCOLOR_REFLECT() END_MESSAGE_MAP() void CNumEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) { TCHAR ch = nChar; CString strText; if (ch == '-') { GetWindowText(strText); int len = strText.GetLength(); if (len <= 0) { CEdit::OnChar(nChar, nRepCnt, nFlags); } else { if (strText.Find('-') < 0) { SetSel(0, 0, FALSE); CEdit::OnChar(nChar, nRepCnt, nFlags); } } } else if (ch >= '0' && ch <= '9') { GetWindowText(strText); if (strText.Find('0') == 0) { //this->Clear(); this->SetWindowText(_T("")); } if (strText.Find('-') == 0 && 1 == HIWORD(this->GetSel()) && ch == '0') //int nSel = HIWORD(this->GetSel()); 获取光标位置 { return; } CEdit::OnChar(nChar, nRepCnt, nFlags); } else if (ch == 0x08 || ch == 0x09) { CEdit::OnChar(nChar, nRepCnt, nFlags); } return; } HBRUSH CNumEdit::CtlColor(CDC* /*pDC*/, UINT /*nCtlColor*/) { CDC* dc = GetDC(); CRect rect; GetClientRect(rect); rect.InflateRect(1, 1, 1, 1); CBrush brush(FrameRectColor); dc->FrameRect(rect, &brush); DeleteObject(brush); ReleaseDC(dc); return NULL; }