C++ BOOST：Windows 共享内存 get_size() 返回零
以下内容来自 BOOST 官方文档。 为什么我在调用 region.get_size() 时得到的大小总是为零？我做错了什么？
int main(int argc, char *argv[])
{
//Create a native windows shared memory object.
windows_shared_memory shm (create_only, "MySharedMemory", read_write, 1000);
//Map the whole shared memory in this process
mapped_region region(shm, read_write);
cout << "SIZE IS " << region.get_size() << endl;
return 0;
}
The below is from the official BOOST docs.
Why do I always get size of zero when calling region.get_size() ? What am I doing wrong?
int main(int argc, char *argv[])
{
//Create a native windows shared memory object.
windows_shared_memory shm (create_only, "MySharedMemory", read_write, 1000);
//Map the whole shared memory in this process
mapped_region region(shm, read_write);
cout << "SIZE IS " << region.get_size() << endl;
return 0;
}
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我想我得到了答案：
来自增强文档：
I think I got the answer:
From boost docs:
在 boost::interprocess您正在使用的
mapped_region构造函数的文档说：因此提供非零大小，一切都会按预期工作：
mapped_region 区域(shm, read_write, 0, 1000);In the boost::interprocess documentation for the
mapped_regionconstructor you're using it says:So provide a non-zero size and everything will work as expected:
mapped_region region(shm, read_write, 0, 1000);