用m_result.UpdateData(FALSE);
   m_result.UpdateWindow();怎么不能，到底用什么？代码如下：
void CC3Dlg::OnDisplay()
{
    // TODO: Add your control notification handler code here
    //do{MessageBox("不在服务范围内，请重新输入!");
    UpdateData(FALSE);
   UpdateWindow();//这句不能少，否则不会立即生效
 
        //}while(!check1(m_begin));
int v1=check2(m_begin);
    //CString str2;
//GetDlgItemText(m_end,m_end);
//do{MessageBox("不在服务范围内，请重新输入!");
    UpdateData(FALSE);
  UpdateWindow();
//}while(!check1(m_end));
int v2=check2(m_end);
this->m_result.ResetContent();
    //cin>>select;
    switch(m_nkind)
    {
case 0:{
        
   
    //cout<<"test city xiabiao:"<<v1<<endl;
    //得出begin end在g[]中的下标
    //cout<<"test city xiabiao:"<<v2<<endl;
  if(v2>=v1)  
    {int count=v2-v1+1;
  //cout<<"the return value:"<<GetWeight(v1, v1+2, select)<<endl;
    double *dist=new double[count];
    int *path=new int[count];
   pshortpath(v1,v2,m_nkind,dist,path);
    this->m_result.AddString("两城市的最短行程距离为:");
    this->m_result.SetCurSel(0);
    this->m_result.AddString((CString)dist[count-1]);
    this->m_result.SetCurSel(0);
   
    this->m_result.AddString("千米");
   
 this->m_result.AddString("两城市的最短行程路线为:");
 
    CString temp;
    CString Rcity[MaxV];
     int t=v2;int v=0;
    for(int k=0;k<count;k++)
    {   if(t==v1)break;
        else {
         temp=GetValue(path[t]);
          Rcity[v]=temp;
          v++;
         t=check2(temp);
       }
    }
//cout<<begin<<":";
    int c=v-1;
    for(int k1=0;k1<=c;k1++)
    {    this->m_result.AddString(Rcity[v-1]);
      
        v--;
    }
    m_result.AddString(m_end);
    m_result.UpdateData(FALSE);
   m_result.UpdateWindow();
    /*
    while(v0<count)
    {
        for(int v=count-1;v>=0;v--)
          if((path[v]!=-1)&&(GetValue(path[v])==temp))//通过每次搜索出当前节点的下一结点
          {   
              cout<<Rcity<<":";
              Rcity=GetValue(v+v1);//逐个变化的应该可以实现,事实上是下标差作怪?
          }                       
          v0++;//count必需写在括号外，才能使循环结束
    }
     cout<<Rcity<<"."<<endl<<endl;//将最末的输出ok?
   
    */         
    }
else{
    int count=v1-v2+1;
    double *dist=new double[count];
    int *path=new int[count];

    pshortpath1(v1,v2,m_nkind,dist,path);
    m_result.AddString("两城市的最短行程距离为:");
    m_result.AddString((CString)dist[count-1]);
    m_result.AddString("千米");
    m_result.AddString("两城市的最短行程路线为:");
    CString temp;
    CString Rcity[MaxV];
     int t=v2;int v=0;
    for(int k=0;k<count;k++)
    {   if(t==v1)break;
        else {
         temp=GetValue(path[t]);
          Rcity[v]=temp;
          v++;
         t=check2(temp);
       }
    }
    int c=v-1;
    for(int k1=0;k1<=c;k1++)
    {    m_result.AddString(Rcity[v-1]);
       v--;
    }
    m_result.AddString(m_end);
            }
           }
        break;

updateData(false) 和updateDate(true)

先用 UpdateDate(true) 再用UpdateData(false)

呵呵，将OnDisplay中的UpdateData(FALSE)改为UpdateData(TRUE)就OK了，很久没进来了    ~

路过，错过。