windows操作系统环境下,用c语言编写一段程序,使其用共享存储区来实现两个进程之间的进程通信。进程A创建 一个长度为512字节的共享内存,并显示写入该共享内存的数据;进程B将共享内存附加 到自己的地址空间,并向共享内存中写入数据。
时间: 2024-11-24 14:42:05 浏览: 38
在Windows操作系统环境下,使用C语言通过`CreateFileMapping`和`MapViewOfFile`函数可以创建并操作共享内存区域,让两个进程A和B之间进行通信。以下是简单的示例代码:
首先,我们创建进程A的代码:
```c
#include <windows.h>
#include <stdio.h>
#define SHARED_MEM_SIZE 512
int main() {
HANDLE hMapFile = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
0, SHARED_MEM_SIZE, "SharedMemory");
if (hMapFile == NULL) {
printf("Failed to create shared memory.\n");
return 1;
}
LPVOID lpBaseAddress = MapViewOfFile(hMapFile, FILE_MAP_WRITE, 0, 0, SHARED_MEM_SIZE);
if (lpBaseAddress == NULL) {
CloseHandle(hMapFile);
printf("Failed to map shared memory.\n");
return 1;
}
// 这里可以往共享内存写入数据
for (int i = 0; i < SHARED_MEM_SIZE / sizeof(int); i++) {
*(int*)lpBaseAddress + i = i * 10; // 示例写入数值
}
printf("Data written to shared memory at address: %p\n", lpBaseAddress);
UnmapViewOfFile(lpBaseAddress);
CloseHandle(hMapFile);
return 0;
}
```
然后,进程B的代码需要包含对进程A的同步机制(例如互斥量或事件),以确保不会同时访问共享内存:
```c
#include <windows.h>
#include <stdio.h>
int main() {
HANDLE hMapFile = OpenFileMapping(FILE_MAP_READ | FILE_MAP_WRITE, FALSE, "SharedMemory");
if (hMapFile == NULL) {
printf("Failed to open shared memory.\n");
return 1;
}
LPVOID lpBaseAddress = MapViewOfFile(hMapFile, FILE_MAP_READ, 0, 0, SHARED_MEM_SIZE);
if (lpBaseAddress == NULL) {
CloseHandle(hMapFile);
printf("Failed to map shared memory.\n");
return 1;
}
// 现在可以从共享内存读取数据
for (int i = 0; i < SHARED_MEM_SIZE / sizeof(int); i++) {
int value = *(int*)lpBaseAddress + i;
printf("Read value from memory at index %d: %d\n", i, value);
}
UnmapViewOfFile(lpBaseAddress);
CloseHandle(hMapFile);
return 0;
}
```
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