进程通信系列-共享内存

#include "stdafx.h"
#include "share.h"
#pragma data_seg("have_jxy")//共享数据段还有种方法是内存映射
char m[2000]="";//必须是定长，不然会卡死
#pragma data_seg()
#pragma comment(linker,"/SECTION:have_jxy,RWS")

share::share(void)
{
now=0;
}

share::~share(void)
{
}

CString last="";
int share::send(CString content)
{
strncpy_s(m,(LPCTSTR)content,sizeof(m));
return 1;
}
CString share::read()
{
CString s(m);
if(last==s)return "";
last=s;
return s;
}

int share::have()
{
return last!=CString(m);
}