CreatePolygonRgn释放问题

Question

以下是我的代码,下面的代码是每秒30次取鼠标的坐标,一但在一个多边形内就返回TRUE,不在时就返回FALSE.
多边形是在一个链表中,
可是下面的代码运行的时候CreatePolygonRgn好象无法释放,内存在一点一点的加大,不知道是什么问题,谁能帮我解决下呢?当然也不怀疑是其它的问题.bool Node_OS::Draw_If(LPDIRECTDRAWSURFACE &P,int X,int Y)
{
    Current = First;
    while (Current != NULL)
    {
          HRGN rgn ;
          HDC hdc;
          if ((rgn=CreatePolygonRgn(Current->XY,Current->Current,ALTERNATE))!=0)
             if (PtInRegion(rgn,X,Y))
             {
                P->GetDC(&hdc);
                SetBkMode(hdc,TRANSPARENT);
                SelectObject(hdc,CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255)));
                SelectObject(hdc,GetStockObject(NULL_BRUSH));
                ::Polyline(hdc,Current->XY,Current->Current+1);
                Disp_Str1 = Current->Name;
                Disp_Str2 = Current->Add;
                return true;
             }
          Current = Current->Next_Node;
          P->ReleaseDC(&hdc);
          DeleteObject(&rgn);
    }
    return false;
}

Answer 1

当PtInRegion时，你直接返回true了，而并没有DeleteObject(&rgn)啊

Answer 2

只见你SelectObject载入,没见你还原
当PtInRegion时直接返回true,既没有DeleteObject(),也没有ReleaseDC()

Answer 3

Up还有 这个数组是不是用了 new

Answer 4

上面的代码发错了,我运行的是下面的
bool Node_OS::Draw_If(LPDIRECTDRAWSURFACE &P,int X,int Y)
{
    HRGN rgn ;
    HDC hdc;
    Current = First;
    while (Current != NULL)
    {
          if ((rgn=CreatePolygonRgn(Current->XY,Current->Current,ALTERNATE))!=0)
          {
             if (PtInRegion(rgn,X,Y))
             {
                P->GetDC(&hdc);
                SetBkMode(hdc,TRANSPARENT);
                SelectObject(hdc,CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255)));
                SelectObject(hdc,GetStockObject(NULL_BRUSH));
                ::Polyline(hdc,Current->XY,Current->Current+1);
                P->ReleaseDC(&hdc);
                DeleteObject(&rgn);
                Disp_Str1 = Current->Name;
                Disp_Str2 = Current->Add;
                return true;
             }
          }
          else
             continue;
          Current = Current->Next_Node;
          P->ReleaseDC(&hdc);
          DeleteObject(&rgn);
    }
    return false;
}

Answer 5

你这程序毛病着呢。最后的那个P->ReleaseDC(&hdc)根本没有意义。如果执行到这句，那么只有PtInRegion不成立，那么P->GetDC(&hdc)根本执行不到啊。

Answer 6

能帮我改改吗?我的思路如下:
当if ((rgn=CreatePolygonRgn(Current->XY,Current->Current,ALTERNATE))!=0) 通过的时候执行
            if (PtInRegion(rgn,X,Y)) 
            { 
                P->GetDC(&hdc); 
                SetBkMode(hdc,TRANSPARENT); 
                SelectObject(hdc,CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255))); 
                SelectObject(hdc,GetStockObject(NULL_BRUSH)); 
                ::Polyline(hdc,Current->XY,Current->Current+1); 
                P->ReleaseDC(&hdc); 
                DeleteObject(&rgn); 
                Disp_Str1 = Current->Name; 
                Disp_Str2 = Current->Add; 
                return true; 
            } 
当坐标不在中的时候if (PtInRegion(rgn,X,Y))执行以下操作 
Current = Current->Next_Node; 
          P->ReleaseDC(&hdc); 
          DeleteObject(&rgn); 当if ((rgn=CreatePolygonRgn(Current->XY,Current->Current,ALTERNATE))!=0) 通过不了的时候 执行下次循环
最终只会P->ReleaseDC(&hdc); 可能无用处,但其它的代码并没有问题啊

Answer 7

楼上的看错了 
是 
Current = Current->Next_Node; 
          P->ReleaseDC(&hdc); 
          DeleteObject(&rgn); 
根本执行不到

Answer 8

建议楼主自己找原因，Debug下设立断点，逐步查找，学会解决问题的能力。
而且在我看来你的程序书写有问题吧，别把大括号省略了，你自己明白，别人还不知道怎么事呢，建议把代码重新写一下。

Answer 9

bool Node_OS::Draw_If(LPDIRECTDRAWSURFACE &P,int X,int Y) 
{ 
    HRGN rgn = NULL; 
    HDC hdc; 
    HPEN hPen = CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255));
    P->GetDC(&hdc);
    Current = First; 
    while (Current != NULL) 
    { 
        rgn=CreatePolygonRgn(Current->XY,Current->Current,ALTERNATE);
        if (rgn!= NULL) 
            continue;
        if (PtInRegion(rgn,X,Y)) 
        { 
            SetBkMode(hdc,TRANSPARENT); 
            
            SelectObject(hdc,hPen); 
            SelectObject(hdc,GetStockObject(NULL_BRUSH)); 
            ::Polyline(hdc,Current->XY,Current->Current+1); 
            P->ReleaseDC(&hdc); 
            DeleteObject(&rgn); 
            DeleteObject(&hPen);
            Disp_Str1 = Current->Name; 
            Disp_Str2 = Current->Add; 
            return true;
         } 
         else
         {
             Current = Current->Next_Node; 
             DeleteObject(&rgn);
             rgn = NULL; 
         } 
    } 
    P->ReleaseDC(&hdc);
    DeleteObject(&hPen);
    return false; 
}
似乎你的CreatePen产生的画笔没有删除导致的问题。

Answer 10

谁说执行不到？当PtInRegion不成立时就会执行到。

Answer 11

我现在的代码如下,虽然短时间好象没什么问题,但从任务管理器中可以看到,这个程序的内存在一点一点的往上涨.如果把这个函数注解掉的话就不涨了,这是什么问题呢?
bool Node_OS::Draw_If(LPDIRECTDRAWSURFACE &P,int X,int Y)
{
    HRGN rgn=NULL;
    Current = First;
    while (Current != NULL)
    {
          rgn=CreatePolygonRgn(Current->XY,Current->Current,ALTERNATE);
          if (rgn == NULL)
          {
             Current = Current->Next_Node;
             continue;
          }          if (PtInRegion(rgn,X,Y))
          {
              HDC hdc;
              P->GetDC(&hdc);
              HPEN hPen = CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255));
              SelectObject(hdc,CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255)));
              SetBkMode(hdc,TRANSPARENT);
              SelectObject(hdc,hPen);
              SelectObject(hdc,GetStockObject(NULL_BRUSH));
              ::Polyline(hdc,Current->XY,Current->Current+1);
              P->ReleaseDC(&hdc);
              DeleteObject(&rgn);
              DeleteObject(&hPen);
              Disp_Str1 = Current->Name;
              Disp_Str2 = Current->Add;
              return true;
          }
          Current = Current->Next_Node;
          continue;
    }
    return false;
}

Answer 12

这一段代码去掉的话也没有任何问题,看不到内存在往上涨
/*
          if (PtInRegion(rgn,X,Y))
          {
              HDC hdc;
              P->GetDC(&hdc);
              HPEN hPen = CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255));
              SelectObject(hdc,CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255)));
              SetBkMode(hdc,TRANSPARENT);
              SelectObject(hdc,hPen);
              SelectObject(hdc,GetStockObject(NULL_BRUSH));
              ::Polyline(hdc,Current->XY,Current->Current+1);
              P->ReleaseDC(&hdc);
              DeleteObject(&rgn);
              DeleteObject(&hPen);
              /*
              Disp_Str1 = Current->Name;
              Disp_Str2 = Current->Add;              return true;
          }   */

Answer 13

bool Node_OS::Draw_If(LPDIRECTDRAWSURFACE &P,int X,int Y)
{
    HRGN rgn=NULL;
    Current = First;
    while (Current != NULL)
    {
          rgn=CreatePolygonRgn(Current->XY,Current->Current,ALTERNATE);
          if (rgn == NULL)
          {
             Current = Current->Next_Node;
             continue;
          }          if (PtInRegion(rgn,X,Y))
          {
              HDC hdc;
              P->GetDC(&hdc);
              P->ReleaseDC(&hdc);
              /*
              HPEN hPen = CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255));
              SelectObject(hdc,CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255)));
              SetBkMode(hdc,TRANSPARENT);
              SelectObject(hdc,hPen);
              SelectObject(hdc,GetStockObject(NULL_BRUSH));
              ::Polyline(hdc,Current->XY,Current->Current+1);              DeleteObject(&rgn);
              DeleteObject(&hPen);
              /*
              Disp_Str1 = Current->Name;
              Disp_Str2 = Current->Add;              return true;      */
          }
          Current = Current->Next_Node;
          continue;
    }
    return false;
}这样一样的内存会自己慢慢的加上来,难道是HDC问题?

Answer 14

HPEN hPen = CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255)); 
              SelectObject(hdc,CreatePen(PS_DASHDOTDOT,2,RGB(0,255,255))); ==有没有搞错啊？怎么还CreatePen？？？不都已经有hPen了么。

Answer 15

P->GetDC(&hdc); 
这里的GetDC函数是什么样的？