一个有趣的bug

?? ? ? ?苦战了3个小时终于发现了问题所在，忍不住发泄一下，随便抽取我写的其中的两个类说明一下问题

在ScriptControl类中：

// ScriptControl.h: interface for the CScriptControl class. // ////////////////////////////////////////////////////////////////////// #if !defined(AFX_SCRIPTCONTROL_H__7B2C1ACD_6804_4DDA_9B0D_D4450AB44804__INCLUDED_) #define AFX_SCRIPTCONTROL_H__7B2C1ACD_6804_4DDA_9B0D_D4450AB44804__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #include "pelcoAPI/soapScriptControlProxy.h" class CScriptControl { public: CScriptControl(); virtual ~CScriptControl(); int BeginScript(int mp_presetNum); int EndScript(int mp_presetNum); int ExecuteScript(int mp_presetNum); int StopScript(int mp_presetNum); int DeleteScript(int mp_presetNum); char *m_IpAddress; char *m_port; private: char *m_soap_endpoint; char *m_scriptName; //soap context struct soap m_stuSoap; //soap objects used to wrap soap message. _ns7__BeginScript m_beginScript; _ns7__BeginScriptResponse m_beginScriptResponse; _ns7__EndScript m_endScript; _ns7__EndScriptResponse m_endScriptResponse; _ns7__ExecuteScript m_executeScript; _ns7__ExecuteScriptResponse m_executeScriptResponse; _ns7__HaltScript m_haltScript; _ns7__HaltScriptResponse m_haltScriptResponse; _ns7__DeleteScript m_deleteScript; _ns7__DeleteScriptResponse m_deleteScriptResponse; }; #endif // !defined(AFX_SCRIPTCONTROL_H__7B2C1ACD_6804_4DDA_9B0D_D4450AB44804__INCLUDED_)

在StreamControl类中：

// StreamControl.h: interface for the CStreamControl class. // ////////////////////////////////////////////////////////////////////// #if !defined(AFX_STREAMCONTROL_H__9BAFCDBD_B1CD_4E7A_A1D6_F33D04F30C33__INCLUDED_) #define AFX_STREAMCONTROL_H__9BAFCDBD_B1CD_4E7A_A1D6_F33D04F30C33__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #include "pelcoAPI/soapStreamControlProxy.h" class CStreamControl { public: CStreamControl(); virtual ~CStreamControl(); int VideoPlay(const char *mp_pSessionId); int VideoPause(const char *mp_pSessionId); char *m_IpAddress; char *m_port; private: char *m_soap_endpoint; //soap context struct soap m_stuSoap; //soap play request objects wrapping soap message _ns4__Play m_videoPlay; _ns4__PlayResponse m_videoPlayResponse; }; #endif // !defined(AFX_STREAMCONTROL_H__9BAFCDBD_B1CD_4E7A_A1D6_F33D04F30C33__INCLUDED_) ?

然后总体的manager类：

#ifdef CSVAPI #else #define CSVAPI _declspec(dllimport) #endif // CSVAPI class CSVAPI CPelcoManager { public: CPelcoManager(char *mp_pchIPAddr,unsigned int mp_iPort); virtual ~CPelcoManager(); public: // all the webservice objects. void * m_pCameraConfig; void * m_pPositionControl; void * m_pLensControl; void * m_pStreamControl; void * m_pVideoOutput; void * m_pEncoderConfig; void * m_pScriptControl; void * m_pPelcoConfig; public: int GetCameraHue(int &iValue); int SetCameraHue(int iValue); int GetCameraBrightness(int &iValue); int SetCameraBrightness(int iValue); int GetCameraContrast(int &iValue); int SetCameraContrast(int iValue); int GetCameraSaturate(int &iValue); int SetCameraSaturate(int iValue); int GetTVFormat(int &iValue); int SetTVFormat(int iValue); char *GetVideoFormat(); char *GetDeviceType(); int GetVideoResolution(int &iValue); int SetVideoResolution(int iValue); int GetVideoFramerate(int &iValue); int SetVideoFramerate(int iValue); int GetVideoBitrate(int &iValue); int SetVideoBitrate(int iValue); int GetVideoQuality(int &iValue); int SetVideoQuality(int iValue); int GetSerialBaudrate(int &iValue); int SetSerialBaudrate(int iValue); int GetSerialStopNum(int &iValue); int SetSerialStopNUm(int iValue); int GetSerialCheckNum(int &iValue); int SetSerialCheckNum(int iValue); int GetSerialDataNum(int &iValue); int SetSerialDataNum(int iValue); int ControlPTZ(unsigned char *pPTZData); int Play(unsigned long ulDestIp,unsigned short nPort); int RefreshSession(); int Disconnect(); private: void CreateObjects(); void InitializeObjects(); //distinguish stop command of focus,zoom,move (x,y) int iStopCommandFlag; char m_szPort[10]; char m_szIpAddr[20]; char m_szServerAddr[20]; }; ?

?

在manager类中定了几个void *其实主要是为了生成dll而不包含头文件才这样做的，然后这样给我带来了致命的问题：

?

在讲void *指向对应的类对象时，定义如下：

m_pCameraConfig = new CCameraConfiguration(); m_pEncoderConfig = new CEncoderConfiguration(); m_pLensControl = new CLensControl(); m_pPositionControl = new CPositioningControl(); m_pStreamControl = new CScriptControl(); m_pVideoOutput = new CVideoOutput(); m_pScriptControl = new CScriptControl(); m_pPelcoConfig = new CPelcoConfiguration();?

很明显大家可以看到，我将m_pStreamControl = new CScriptControl(); 错误的指向了ScriptControl类，

而我在调用时：

if (FALSE == ((CVideoOutput *)m_pVideoOutput)->VideoQuery()) { return FALSE; } if (FALSE == ((CVideoOutput *)m_pVideoOutput)->VideoConnect(receivePort,30)) { return FALSE; } //send play request to receive the video stream char temp[100]; memset(temp,100); strcpy(temp,((CVideoOutput *)m_pVideoOutput)->m_strSessionId); // // HWND hwnd = ::GetForegroundWindow(); // if (temp != NULL) // { // ::MessageBox(hwnd,temp,NULL,MB_OK); // } if (FALSE == ((CStreamControl *)m_pStreamControl)->VideoPlay(temp)) { return FALSE; }?

调用时是通过强制转换来调用成员变量的，当然我在调用VideoPlay函数是失败的，

但是在debug时，却无法确认是此问题所导致，原因是通过添加断点可以得知，调用

可以进入函数内部，并且在函数内部走的很顺利，终于不得已，最后通过在构造函数内部添加断点，

通过一个未初始化的变量得知，是一开始就new出错了，哎，很悲剧，真是无语，解决后更是兴奋的无语 。。。