why cause exception??

[ttzzgg_80713]

:confused:class TaskInfoBase { .... virtual void setSize(int) = 0; }; class NewTaskInfo : public TaskInfoBase { NewTaskInfo() { InitializeCriticalSection(&m_cs); } ~NewTaskInfo() { DeleteCriticalSection(&m_cs); } void setSize(int); static CRITICAL_SECTION m_cs; }; class NewTask : public NewTaskInfo, pubic NewTaskBase { }; class HttpDownload : public DownData , public CHttpDown { public: HttpDownload():NewTaskInfo() {} void write(); NewTask *m_pTask; }; //****************************************************************************** // Implement CRITICAL_SECTION NewTaskInfo::m_cs; void NewTaskInfo::setSize(int i) { EnterCriticalSection(&m_cs); // Exception here . m_nSize = i; LeaveCriticalSection(&m_cs); } void HttpDown::write() { .... m_pTask->setSize(20002); // Enter NewTaskInfo::setSize(); }

[Gary R Wheeler]

I would guess that the m_pTask pointer doesn't point to a valid NewTaskInfo object. If that's the case, the this pointer on entry to the setSize function isn't valid, and the resulting m_cs member passed to the EnterCriticalSection function doesn't represent a valid critical section.

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Software Zen: delete this;