【求助】大侠救救我，一个内存突然改变的问题，卡了我很久 - C++ Builder / Windows SDK/API
先贴代码：
Russia.h:
#define Lstru(x,y) {SI=sizeof(POINTS)*4*4;\ POINTS Lstru[4][4]={x,y,x+1,y,x,y-1,x,y-2,\ x,y,x,y-1,x+1,y-1,x+2,y-1,\ x,y-2,x+1,y-2,x+1,y-1,x+1,y,\ x,y,x+1,y,x+2,y,x+2,y-1};\ now=Lstru;\ }#define Tstru(x,y) {\ SI=sizeof(POINTS)*4*4;\ POINTS Tstru[4][4]={x,y,x+1,y,x+2,y,x+1,y-1,\ x,y,x,y-1,x,y-2,x-1,y-1,\ x+1,y,x,y-1,x+1,y-1,x+2,y-1,\ x,y-1,x+1,y,x+1,y-1,x+1,y-2};\ now=Tstru;}#define Zstru(x,y) {\ SI=sizeof(POINTS)*2*4;\ POINTS Zstru[2][4]={x,y,x+1,y,x+1,y-1,x+2,y-1,\ x,y-1,x,y-2,x+1,y,x+1,y-1};\ now=Zstru;}#define Istru(x,y) {\ SI=sizeof(POINTS)*2*4;\ POINTS Istru[2][4]={x,y,x+1,y,x+2,y,x+3,y,\ x,y,x,y-1,x,y-2,x,y-3};\ now=Istru;}#define Hstru(x,y) {SI=sizeof(POINTS)*4;\ POINTS Hstru[4]={x,y,x+1,y,x,y-1,x+1,y-1};\ now=Hstru;}
#include <windows.h>
#include"Russia.h"
#define RUSSIA TEXT("Russia")
#define CELL 20
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int Data[25][15]={0};
RECT rect;
static void *now=NULL;
POINTS *tem=NULL;
POINTS *tru=NULL;
int SI,i;
POINTS * IsOK(int dr);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,
PSTR iCmdLine,int iShowCmd)
{
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style=CS_HREDRAW|CS_VREDRAW;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.lpfnWndProc=WndProc;
wndclass.hInstance=hInstance;
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(NULL,IDI_INFORMATION);
wndclass.lpszMenuName=NULL;
wndclass.lpszClassName=RUSSIA;
if(!RegisterClass(&wndclass))
return 0;
if(!(hwnd=CreateWindow(RUSSIA,TEXT("Russia"),
WS_OVERLAPPED,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL)))
return 0;
ShowWindow(hwnd,iShowCmd);
UpdateWindow(hwnd);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
switch(message)
{
case WM_CREATE:
i=rand()%4;
if(i==0)
Lstru(7,0)
else if(i==1) Tstru(7,0)
else if(i==2) Zstru(7,0)
else if(i==3) Istru(7,0)
else Hstru(7,0)
tru=(POINTS *)now;
SetTimer(hwnd,1,500,NULL);
return 0;
case WM_TIMER:
IsOK(0);
InvalidateRect(hwnd,NULL,true);
return 0;
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
for(int w=0;w <=300;w+=CELL)
{
MoveToEx(hdc,w,0,NULL);
LineTo(hdc,w,500);
}
for(int h=0;h <=500;h+=CELL)
{
MoveToEx(hdc,0,h,NULL);
LineTo(hdc,300,h);
}
tem=tru;
for (i=0;i <4;i++)
{
rect.left=(tem->x)*CELL;
rect.bottom=(tem->y)*CELL;
rect.right=(tem->x)*(CELL+1);
rect.top=(tem->y)*(CELL+1);
FillRect(hdc,&rect,(HBRUSH)BLACK_BRUSH);
tem++;
}
for(i=0;i <15;i++)
for(int j=0;j <25;j++)
{
if(Data[i][j]==1)
{
POINTS p;
p.x=i*CELL;
p.y=j*CELL;
rect.left=p.x;rect.bottom=p.y;
rect.right=p.x+CELL;rect.top=p.y+CELL;
FillRect(hdc,&rect,(HBRUSH)GRAY_BRUSH);
}
}
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
tru=NULL;
tem=NULL;
free(now);
now=NULL;
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}
POINTS * IsOK(int dr)
{
if(dr==0)//will down
{
tem=tru;
for(int i=0;i <4;i++)
{
if(tem->x <14&&tem->y>=0&&tem->y <24&&tem->y>=0)
{
if (Data[tem->x][tem->y+1]==1||(tem->y+1)>24)
return ((POINTS *)now);
tem++;}
}
tem=(POINTS *)now;
for(int i=0;i <SI;)
{
(tem->y)++;
tem++;
i+=2;
}
return (tru);
}
else if(dr==1)//will left
{
tem=tru;
for(int i=0;i <4;i++)
{
if(tem->x <14&&tem->y>=0&&tem->y <24&&tem->y>=0)
{
if (Data[tem->x-1][tem->y]==1||(tem->x-1) <0)
return ((POINTS *)now);
tem++;}
}
tem=(POINTS *)now;
for(int i=0;i <SI;)
{
(tem->x)--;
tem++;
i+=2;
}
return (tru);
}
else
{//will right
tem=tru;
for(int i=0;i <4;i++)
{if(tem->x <14&&tem->y>=0&&tem->y <24&&tem->y>=0)
{if (Data[tem->x+1][tem->y]==1||(tem->x++)>14)
return ((POINTS *)now);
tem++;
}
}
tem=(POINTS *)now;
for(int i=0;i <SI;)
{
(tem->x)++;
tem++;
i+=2;
}
}
}
//for down ,left or right OK?
now=Lstru;\
}
从这个宏看，now指向局部变量，这个局部变量的生命期很短，出了这全宏，其生命期也就结束。这上宏也就是没起到实际作用。局部变量不是等到return 0生命期才结束，而是只存活在定义它的{}间。
你可以用new将变量放在堆中，这样其生命期会一直到你delete它时，才结束。
[解决办法]