void CMainFrame::OnButton32771()
{
// TODO: Add your command handler code here
// 这个程序的功能是调用由matlab生成的ppp3.dll画图，并返回字符串t1：判断是否画图成 // 功。最后显示t1。
ppp3Initialize();

mxArray *t0,*t,*t1;
CString s0="e:\\;BL_X;BL_T;BL_R;";
CString s="4,0.95,0.78,0.61,0.43,0,0,0,0,0,0,0,0,0,0,0,0,0,0";

t0=mxCreateString(s0);
t=mxCreateString(s);
t1=mlfBl_new(t0,t);

char *str=mxArrayToString(t1);

::AfxMessageBox(str);

//销毁t， 释放内存
mxDestroyArray(t0);
mxDestroyArray(t);
//注销动态链接库
ppp3Terminate();
}

编译连接均没错，运行后总报错：unhandled exception in bl1.exe(libmx.dll):0xC0000005;Access violation.
我察看了一下，是char *str=mxArrayToString(t1)有错，这一句是将matlab字符串转换为vc字符串。请教高手，怎么修改源程序呢？