mfc调试问题Debug Assertion Failed
我正在看《深入浅出mfc》遇到的问题
在写scribble step1时,编译ok了但调试出问题了。。
单击调试弹出的对话框是:
Debug Assertion Failed
File:list_o.cpp
Line:196
点retry后黄色箭头定位在如下函数》》处(in list_o.cpp)
CObject* CObList::RemoveHead()
{
ASSERT_VALID(this);
》》 ASSERT(m_pNodeHead != NULL); // don't call on empty list !!!
ASSERT(AfxIsValidAddress(m_pNodeHead, sizeof(CNode)));
CNode* pOldNode = m_pNodeHead;
CObject* returnValue = pOldNode->data;
m_pNodeHead = pOldNode->pNext;
if (m_pNodeHead != NULL)
m_pNodeHead->pPrev = NULL;
else
m_pNodeTail = NULL;
FreeNode(pOldNode);
return returnValue;
}
最后通过单步调试,发现错误出现在如下文件的》》处,
void CScribbleDoc::DeleteContents()
{
while (!m_strokeList.IsEmpty());
{
》》 delete m_strokeList.RemoveHead();
}
CDocument::DeleteContents();
}
这到底是什么问题啊 小弟谢谢各位大哥大姐了 vc++有难度啊 要好好学啊 呵呵