VC 共享內存（持續收發數據）

發送端

創建共享內存用的API

HANDLE CreateFileMapping(
  HANDLE hFile,              // handle to file to map
  LPSECURITY_ATTRIBUTES lpFileMappingAttributes,    // optional security attributes, 是否被繼承
  DWORD flProtect,           // protection for mapping object
  DWORD dwMaximumSizeHigh,   // high-order 32 bits of object size
  DWORD dwMaximumSizeLow,    // low-order 32 bits of object size
  LPCTSTR lpName             // name of file-mapping object
);
hFile     // (HANDLE)0xFFFFFFFF 不指定共享內存句柄
lpFileMappingAttributes        // 是否被繼承
flProtect        // 讀寫權限
dwMaximumSizeHigh        // 
dwMaximumSizeLow        // 共享內存大小
lpName        // 名字

#include <stdio.h>
#include <windows.h>
#include <iostream>
#include <string> 
using namespace std;
int main()

{
    int nRetCode = 0;

    char szBuffer[] = "Shine";

    HANDLE hMapping = CreateFileMapping(NULL,NULL,PAGE_READWRITE,0,4096,"ShareMemory");

    LPVOID lpBase = MapViewOfFile(hMapping,FILE_MAP_WRITE|FILE_MAP_READ,0,0,0);


//    strcpy((char*)lpBase,szBuffer);
	string s;
	while(1)
	{
		cin>>s;
		strcpy((char *)lpBase,s.c_str());
		if(s == "exit")
		{
			Sleep(1000);
			break;
		}
	}
    

    UnmapViewOfFile(lpBase);

    CloseHandle(hMapping);


    return nRetCode;
}

接收端

#include <stdio.h>
#include <windows.h>
#include <string.h>
#include <iostream>
using namespace std;
int main()
{
    int nRetCode = 0;
    HANDLE hMapping;
    do
    {
    	hMapping = OpenFileMapping(FILE_MAP_ALL_ACCESS,NULL,"ShareMemory");
	}while(!hMapping);
	char *szBuffer;
    if (hMapping)
    {
        wprintf(L"%s\r\n",L"wait Data");
// 		LPVOID lpBase = MapViewOfFile(hMapping,FILE_MAP_READ|FILE_MAP_WRITE,0,0,0);

		while(1)
		{
			szBuffer =  (char *)MapViewOfFile(hMapping,FILE_MAP_READ|FILE_MAP_WRITE,0,0,0);
//			strcpy(szBuffer,(char*)lpBase);
			if(szBuffer[0])
			{		
				printf("%s\n",szBuffer);
				if(strcmp(szBuffer,"exit") == 0)
				{
					break;
				}
		    	memset(szBuffer,0,sizeof(szBuffer));
			}
		}
    }
	memset(szBuffer,0,sizeof(szBuffer));
	UnmapViewOfFile(szBuffer);
    CloseHandle(hMapping);
    return nRetCode;
}

多線程方案

發送端

#include <stdio.h>
#include <windows.h>
#include <iostream>
#include <string> 
using namespace std;
HANDLE ShareThread;
HANDLE hEventInput;
char szBuffer[] = "Shine";
string inputStr;
class StaticLock
{
public:
	StaticLock()
	{
		InitializeCriticalSection(&g_csTerm);
	};
	~StaticLock()
	{
		DeleteCriticalSection(&g_csTerm);
	};
	void lockon()
	{
		EnterCriticalSection(&g_csTerm);
	};
	void lockoff()
	{
		LeaveCriticalSection(&g_csTerm);
	};
private:
	CRITICAL_SECTION g_csTerm;
};
StaticLock lock;
DWORD WINAPI Share_thread(LPVOID)
{
	HANDLE hMapping = CreateFileMapping(NULL,NULL,PAGE_READWRITE,0,4096,"ShareMemory");

    LPVOID lpBase = MapViewOfFile(hMapping,FILE_MAP_WRITE|FILE_MAP_READ,0,0,0);


//    strcpy((char*)lpBase,szBuffer);
	string s;
	while(1)
	{
		WaitForSingleObject(hEventInput,INFINITE);
		lock.lockon();
		strcpy((char *)lpBase,inputStr.c_str());
		if(s == "exit")
		{
			Sleep(1000);
			break;
		}
		lock.lockoff();
		ResetEvent(hEventInput);
	}
	UnmapViewOfFile(lpBase);
    CloseHandle(hMapping);
}
int main(void)
{
    int nRetCode = 0;
	hEventInput = CreateEvent(NULL,true,false,NULL);
	ShareThread = CreateThread(NULL,0,Share_thread,NULL,0,NULL);
//HANDLE CreateFileMapping(
//  HANDLE hFile,                       //物理文件句柄
//  LPSECURITY_ATTRIBUTES lpAttributes, //安全設置
//  DWORD flProtect,                    //保護設置
//  DWORD dwMaximumSizeHigh,            //高位文件大小
//  DWORD dwMaximumSizeLow,             //低位文件大小
//  LPCTSTR lpName                      //共享內存名稱
//);
	string s;
	while(1)
	{
		cin>>s;
		lock.lockon();
		inputStr = s;
		lock.lockoff();
		SetEvent(hEventInput);
	}
	CloseHandle(ShareThread);
	CloseHandle(hEventInput);
    return nRetCode;
}

接受端

#include <stdio.h>
#include <windows.h>
#include <string.h>
#include <iostream>
using namespace std;
HANDLE hThreadShared;
HANDLE hMapping;
DWORD WINAPI Shared_Thread(LPVOID)
{
	do
    {
    	hMapping = OpenFileMapping(FILE_MAP_ALL_ACCESS,NULL,"ShareMemory");
	}while(!hMapping);
	char *szBuffer;
    if (hMapping)
    {
        wprintf(L"%s\r\n",L"wait Data");
// 		LPVOID lpBase = MapViewOfFile(hMapping,FILE_MAP_READ|FILE_MAP_WRITE,0,0,0);

		while(1)
		{
			szBuffer =  (char *)MapViewOfFile(hMapping,FILE_MAP_READ|FILE_MAP_WRITE,0,0,0);
//			strcpy(szBuffer,(char*)lpBase);
			if(szBuffer[0])
			{		
				printf("%s\n",szBuffer);
				if(strcmp(szBuffer,"exit") == 0)
				{
					break;
				}
		    	memset(szBuffer,0,sizeof(szBuffer));
			}
		}
    }
    memset(szBuffer,0,sizeof(szBuffer));
	UnmapViewOfFile(szBuffer);
    CloseHandle(hMapping);
}
int main()
{
    int nRetCode = 0;
	hThreadShared = CreateThread(NULL,0,Shared_Thread,NULL,0,NULL);
	WaitForSingleObject(hThreadShared, INFINITE);
	CloseHandle(hThreadShared);
    return nRetCode;
}