80.共享内存实现进程通信

• 服务器创建共享内存

  #include<stdio.h>
  #include<stdlib.h>
  #include<Windows.h>
  
  #define  SIZE 4096
  //指针标识首地址
  LPVOID lpdata = NULL;
  
  
  void main()
  {
      if (lpdata!=NULL)
      {
          puts("共享内存存在");
      }
      //创建共享内存
      HANDLE hmap = CreateFileMappingA(INVALID_HANDLE_VALUE, NULL,
          PAGE_READWRITE | SEC_COMMIT, 0, SIZE, "cgwmem");
  
      if (hmap==NULL)
      {
          puts("创建失败");
      }
      else
      {
          //映射文件到指针
          lpdata = MapViewOfFile(hmap, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
  
          int a[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
          memcpy(lpdata, a, 40);
      }
  
      system("pause");
  
  
      UnmapViewOfFile(lpdata);//解除
      CloseHandle(hmap);
      system("pause");
  
  
  }

• 服务器使用这片共享内存

  #include<stdio.h>
  #include<stdlib.h>
  #include<Windows.h>
  
  void main()
  {
      HANDLE hmapfile = OpenFileMappingA(FILE_MAP_READ, FALSE, "cgwgmem");
      if (hmapfile == NULL)
      {
          printf("开辟失败");
      }
  
      //创建指针，指向这片内存
      LPVOID lpbase = MapViewOfFile(hmapfile, FILE_MAP_READ, 0, 0, 0);
      if (lpbase == NULL)
      {
          printf("open失败");
  
      }
  
      int*p = lpbase;
      for (int i = 0; i < 10;i++)
      {
          printf("%d
  ", p[i]);
      }
  
  
      UnmapViewOfFile(lpbase);//解除
      CloseHandle(hmapfile);
  
  
      system("pause");
  }