Question

我在MFC中创建了一个CBUTTON的类，用于做主窗体BUTTON1按钮的ONCLICKUP和DOWN事件，执行了以下代码出错？

#include "stdafx.h"#include "text.h"#include "SET1.h"#include "textDlg.h"IMPLEMENT_DYNAMIC(SET1, CButton)SET1::SET1(){}SET1::~SET1(){}BEGIN_MESSAGE_MAP(SET1, CButton) ON_WM_LBUTTONUP() ON_WM_LBUTTONDOWN()END_MESSAGE_MAP()void SET1::OnLButtonUp(UINT nFlags, CPoint point){ // TODO: 在此添加消息处理程序代码和/或调用默认值 //CDC* pDC; RECT ClientRect; CWnd* pWnd = GetDlgItem(IDC_STATIC1); CDC *pDC = pWnd->GetDC(); ReleaseDC(pDC); ((CWnd*)GetDlgItem(IDC_STATIC1))->GetClientRect(&ClientRect); CBrush fillBrush(RGB(255,0,0)); pDC->FillRect(&ClientRect,&fillBrush); ((CWnd*)GetDlgItem(IDC_STATIC1))->ReleaseDC(pDC); CButton::OnLButtonUp(nFlags, point);}void SET1::OnLButtonDown(UINT nFlags, CPoint point){ // TODO: 在此添加消息处理程序代码和/或调用默认值 CButton::OnLButtonDown(nFlags, point);

Answer 1

pDC用法有问题，
请仔细检查一下，前面已经Release了pDC，后面还在用。