85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
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#include <windows.h>
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#include <string>
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#define memSize 512
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bool writeSharedMem(std::string memName,std::string text)
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{
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char* memNameChar = (char*)(memName.c_str());
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HANDLE hMapFile = OpenFileMapping(
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FILE_MAP_ALL_ACCESS, // 读/写访问
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FALSE, // 句柄不继承
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memNameChar // 共享内存对象的名称
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);
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if (hMapFile == NULL)
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{
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hMapFile = CreateFileMapping(
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INVALID_HANDLE_VALUE, // 使用分页文件
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NULL, // 默认安全性
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PAGE_READWRITE, // 读/写访问
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0, // 最大对象大小（高位32位）
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memSize, // 最大对象大小（低位32位）
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memNameChar // 共享内存对象的名称
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);
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}
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if (hMapFile == NULL)
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return false;
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char* pBuf = (char*)MapViewOfFile(
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hMapFile, // 共享内存对象的句柄
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FILE_MAP_ALL_ACCESS, // 读/写权限
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0,
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0,
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memSize
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);
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if (pBuf == NULL) {
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std::cerr << "Could not map view of file (" << GetLastError() << ")." << std::endl;
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CloseHandle(hMapFile);
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return false;
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}
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strcpy(pBuf, text.c_str());
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UnmapViewOfFile(pBuf);
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//CloseHandle(hMapFile);
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}
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std::string readSharedMem(std::string memName)
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{
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char* memNameChar = (char*)(memName.c_str());
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HANDLE hMapFile = OpenFileMapping(
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FILE_MAP_ALL_ACCESS, // 读/写访问
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FALSE, // 句柄不继承
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memNameChar // 共享内存对象的名称
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);
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if (hMapFile == NULL)
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{
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std::cerr << "Could not open file mapping object (" << GetLastError() << ")." << std::endl;
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return "notFound";
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}
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char* pBuf = (char*)MapViewOfFile(
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hMapFile, // 共享内存对象的句柄
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FILE_MAP_ALL_ACCESS, // 读/写权限
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0,
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0,
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memSize
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);
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std::string reuslt = pBuf;
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UnmapViewOfFile(pBuf);
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//CloseHandle(hMapFile);
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return reuslt;
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}
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bool releaseSharedMem(std::string memName)
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{
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char* memNameChar = (char*)(memName.c_str());
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HANDLE hMapFile = OpenFileMapping(
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FILE_MAP_ALL_ACCESS, // 读/写访问
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FALSE, // 句柄不继承
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memNameChar // 共享内存对象的名称
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);
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if (hMapFile == NULL)
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{
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return false;
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}
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CloseHandle(hMapFile);
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return true;
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}
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#pragma once
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