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\n", 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\n", 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 }
