我用C++编了个.cpp的文件，里面把从txt中读来的文本转换成16进制数放到char数组里，运行时没有错误的。现在把它添加到一个MFC中，用网络套接字把这个char数组的数据发送出去，可是一运行就出现下面的错误提示：Debug Assertion Failed!  File: afx.inl  Line:177...
          应用程序发生异常 unknown software exception (0x80000003),位置为0x7c92120e
    上网查了好多，好像说跟内存泄漏什么的有关，我在MFC里加的内容如下：请懂得朋友帮我看看吧，到底是啥错误啊，为什么挪到这里就不对了呢？
CSendDataDlg::HexToChar(char ch) // Char <->Hex
{
     if((ch>='0')&&(ch<='9'))
       return ch-0x30;
    else if((ch>='A')&&(ch<='F'))
       return ch-'A'+10;
    else if((ch>='a')&&(ch<='f'))
       return ch-'a'+10;        
    else
       return -1;
}

::ifstream myfile("E:\\data.txt");//打开存放数据的文本文件

void CSendDataDlg::OnTimer(UINT nIDEvent)
{
    // TODO: Add your message handler code here and/or call default
    //发数据

    char BfSnd[200];
    myfile.getline (BfSnd,sizeof(BfSnd));
    str=BfSnd;
    unsigned char tmpByte = 0x00;
    strLen = str.GetLength();        //////////字符串的长度
    unsigned char SendData[200];
    memset(SendData, '\0', sizeof(SendData));
    DataLen=0;                       ///////实际发送的字节数

////////////去掉数据中的空格，将两个数字作为一 个16进制数
 for (int j=0; DataLen<128,j<strLen; DataLen++,j++)
 {
       if (str[j] == ' ')
       j++;
       if(str[j]==' ')
       break;
       tmpByte =((HexToChar(str[j])<<4)+ HexToChar(str[j+1]));//取低4位然后相加。  
       SendData[DataLen]=tmpByte;
       j++;
    }

///////利用套接字发送
   int iSend= m_sockSend.SendTo(SendData,DataLen+1,6801,"10.1.34.10",0);   
   UpdateData(FALSE);
   CDialog::OnTimer(nIDEvent);
}


还有call stack里面写着下面一堆内容，但是我太菜了看不懂什么意思：
NTDLL! 7c92120e()
_CrtDbgReport               
(int 2, const char * 0x5f4adf34 _szAfxInl, int 177, const char * 0x00000000, const char * 0x00000000) line 353
AfxAssertFailedLine(const char * 0x5f4adf34 _szAfxInl, int 177) line 39 + 20 bytes
CString::operator[](int 33) line 177 + 31 bytes
CSendDataDlg::OnTimer(unsigned int 1) line 273 + 21 bytes
CWnd::OnWndMsg(unsigned int 275, unsigned int 1, long 0, long * 0x0012af80) line 1840
CWnd::WindowProc(unsigned int 275, unsigned int 1, long 0) line 1596 + 30 bytes
AfxCallWndProc(CWnd * 0x0012fe5c, HWND__ * 0x002f0244, unsigned int 275, unsigned int 1, long 0) line 215 + 26 bytes
AfxWndProc(HWND__ * 0x002f0244, unsigned int 275, unsigned int 1, long 0) line 379
AfxWndProcBase(HWND__ * 0x002f0244, unsigned int 275, unsigned int 1, long 0) line 220 + 21 bytes
USER32! 77d18734()
USER32! 77d18816()
USER32! 77d189cd()
USER32! 77d18a10()
USER32! 77d27721()
USER32! 77d249c4()
USER32! 77d3a956()
USER32! 77d3a2bc()
USER32! 77d663fd()
USER32! 77d664a2()
USER32! 77d50877()
USER32! 77d5082f()
__crtMessageBoxA(const char * 0x0012b6f0, const char * 0x102579a0 `string', unsigned int 73746) line 65
CrtMessageWindow(int 2, const char * 0x5f4adf34 _szAfxInl, const char * 0x0012c824, const char * 0x00000000, const char * 0x0012e848) line 520 + 22 bytes
_CrtDbgReport(int 2, const char * 0x5f4adf34 _szAfxInl, int 177, const char * 0x00000000, const char * 0x00000000) line 419 + 76 bytes
AfxAssertFailedLine(const char * 0x5f4adf34 _szAfxInl, int 177) line 39 + 20 bytes
CString::operator[](int 75) line 177 + 31 bytes
CSendDataDlg::OnTimer(unsigned int 1) line 273 + 21 bytes
CWnd::OnWndMsg(unsigned int 275, unsigned int 1, long 0, long * 0x0012fb70) line 1840
CWnd::WindowProc(unsigned int 275, unsigned int 1, long 0) line 1596 + 30 bytes
AfxCallWndProc(CWnd * 0x0012fe5c, HWND__ * 0x002f0244, unsigned int 275, unsigned int 1, long 0) line 215 + 26 bytes
AfxWndProc(HWND__ * 0x002f0244, unsigned int 275, unsigned int 1, long 0) line 379
AfxWndProcBase(HWND__ * 0x002f0244, unsigned int 275, unsigned int 1, long 0) line 220 + 21 bytes
USER32! 77d18734()
USER32! 77d18816()
USER32! 77d189cd()
USER32! 77d196c7()
CWinThread::PumpMessage() line 853
CWnd::RunModalLoop(unsigned long 4) line 3489 + 19 bytes
CDialog::DoModal() line 539 + 12 bytes
CSendDataApp::InitInstance() line 65 + 11 bytes
AfxWinMain(HINSTANCE__ * 0x00400000, HINSTANCE__ * 0x00000000, char * 0x00141f2f, int 1) line 39 + 11 bytes
WinMain(HINSTANCE__ * 0x00400000, HINSTANCE__ * 0x00000000, char * 0x00141f2f, int 1) line 30
WinMainCRTStartup() line 330 + 54 bytes
KERNEL32! 7c817077()

自己顶一下吧。好像是CString下标访问越界。但是看不出哪里越界了...

for (int j=0; DataLen<128,j<strLen; DataLen++,j++)                     //j < strLen
{
       if (str[j] == ' ')
       j++;
       if(str[j]==' ')
       break;
       tmpByte =((HexToChar(str[j])<<4)+ HexToChar(str[j+1]));//取低4位然后相加。   //j + 1  ????
       SendData[DataLen]=tmpByte;
       j++;
    }

///////利用套接字发送
   int iSend= m_sockSend.SendTo(SendData,DataLen+1,6801,"10.1.34.10",0);   
   UpdateData(FALSE);
   CDialog::OnTimer(nIDEvent);
}


[ 本帖最后由 东海一鱼 于 2010-9-24 12:57 编辑 ]

其实是把两个字符连起来当成一个16进制数算出来，难道是这儿错了...

[ 本帖最后由 cady_s 于 2010-9-24 13:27 编辑 ]

char chararry[128];

for(int i = 0; i < 128; i++)
{
    chararray[i] = chararry[i+1] =  '0';      // if Current i = 127    i + 1 =  ??????????
}