向内存中写数据
1 // SharedMemorySample_write_main.cpp 2 #include <SDKDDKVer.h> 3 #include <Windows.h> 4 #include <stdio.h> 5 6 int main(int argc, char* argv[]) 7 { 8 int shmem_size = 16; // 16byte 9 HANDLE shmem = INVALID_HANDLE_VALUE; 10 HANDLE mutex = INVALID_HANDLE_VALUE; 11 12 mutex = ::CreateMutex(NULL, FALSE, "mutex_sample_name"); 13 14 shmem = ::CreateFileMapping( 15 INVALID_HANDLE_VALUE, 16 NULL, 17 PAGE_READWRITE, 18 0, 19 shmem_size, 20 "shared_memory_name" 21 ); 22 23 char *buf = (char*)::MapViewOfFile(shmem, FILE_MAP_ALL_ACCESS, 0, 0, shmem_size); 24 25 26 for (unsigned int c = 0; c < 60; ++c) { 27 // mutex lock 28 WaitForSingleObject(mutex, INFINITE); 29 30 // write shared memory 31 memset(buf, c, shmem_size); 32 33 printf("write shared memory...c=%d ", c); 34 35 // mutex unlock 36 ::ReleaseMutex(mutex); 37 38 ::Sleep(1000); 39 } 40 41 // release 42 ::UnmapViewOfFile(buf); 43 ::CloseHandle(shmem); 44 ::ReleaseMutex(mutex); 45 46 return 0; 47 }
从内存中读数据
1 // SharedMemorySample_read_main.cpp 2 #include <SDKDDKVer.h> 3 #include <Windows.h> 4 #include <stdio.h> 5 6 int main(int argc, char* argv[]) 7 { 8 int shmem_size = 16; // 16byte 9 HANDLE shmem = INVALID_HANDLE_VALUE; 10 HANDLE mutex = INVALID_HANDLE_VALUE; 11 12 mutex = ::CreateMutex(NULL, FALSE, "mutex_sample_name"); 13 14 shmem = ::CreateFileMapping( 15 INVALID_HANDLE_VALUE, 16 NULL, 17 PAGE_READWRITE, 18 0, 19 shmem_size, 20 "shared_memory_name" 21 ); 22 23 char *buf = (char*)::MapViewOfFile(shmem, FILE_MAP_ALL_ACCESS, 0, 0, shmem_size); 24 25 26 for (unsigned int c = 0; c < 60; ++c) { 27 // mutex lock 28 WaitForSingleObject(mutex, INFINITE); 29 30 printf("read shared memory...c=%d ", buf[0]); 31 32 // mutex unlock 33 ::ReleaseMutex(mutex); 34 35 ::Sleep(1000); 36 } 37 38 // release 39 ::UnmapViewOfFile(buf); 40 ::CloseHandle(shmem); 41 ::ReleaseMutex(mutex); 42 43 return 0; 44 }