C++：使用 Win32 API 实现命名管道
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C++: Implementing Named Pipes using the Win32 API
提问by Mike Pateras
I'm trying to implement named pipes in C++, but either my reader isn't reading anything, or my writer isn't writing anything (or both). Here's my reader:
我正在尝试在 C++ 中实现命名管道，但是我的读者没有阅读任何内容，或者我的作者没有写任何内容（或两者兼有）。这是我的读者：
int main()
{
HANDLE pipe = CreateFile(GetPipeName(), GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
char data[1024];
DWORD numRead = 1;
while (numRead >= 0)
{
ReadFile(pipe, data, 1024, &numRead, NULL);
if (numRead > 0)
cout << data;
}
return 0;
}
LPCWSTR GetPipeName()
{
return L"\\.\pipe\LogPipe";
}
And here's my writer:
这是我的作家：
int main()
{
HANDLE pipe = CreateFile(GetPipeName(), GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
string message = "Hi";
WriteFile(pipe, message.c_str(), message.length() + 1, NULL, NULL);
return 0;
}
LPCWSTR GetPipeName()
{
return L"\\.\pipe\LogPipe";
}
Does that look right? numRead in the reader is always 0, for some reason, and it reads nothing but 1024 -54's (some weird I character).
看起来对吗？出于某种原因，阅读器中的 numRead 始终为 0，它只读取 1024 -54（一些奇怪的 I 字符）。
Solution:
解决方案：
Reader (Server):
读者（服务器）：
while (true)
{
HANDLE pipe = CreateNamedPipe(GetPipeName(), PIPE_ACCESS_INBOUND | PIPE_ACCESS_OUTBOUND , PIPE_WAIT, 1, 1024, 1024, 120 * 1000, NULL);
if (pipe == INVALID_HANDLE_VALUE)
{
cout << "Error: " << GetLastError();
}
char data[1024];
DWORD numRead;
ConnectNamedPipe(pipe, NULL);
ReadFile(pipe, data, 1024, &numRead, NULL);
if (numRead > 0)
cout << data << endl;
CloseHandle(pipe);
}
Writer (client):
作家（客户）：
HANDLE pipe = CreateFile(GetPipeName(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (pipe == INVALID_HANDLE_VALUE)
{
cout << "Error: " << GetLastError();
}
string message = "Hi";
cout << message.length();
DWORD numWritten;
WriteFile(pipe, message.c_str(), message.length(), &numWritten, NULL);
return 0;
The server blocks until it gets a connected client, reads what the client writes, and then sets itself up for a new connection, ad infinitum. Thanks for the help, all!
服务器阻塞，直到它获得连接的客户端，读取客户端写入的内容，然后为新的连接设置自己，无限期。谢谢大家的帮助！
采纳答案by Anton Tykhyy
You must use CreateNamedPipe()to create the server end of a named pipe. Be sure to specify a non-zero buffer size, zero (documented by MSDN as 'use system default buffer size') doesn't work. MSDN has decent samplesfor a multi-threaded client&server.
您必须使用CreateNamedPipe()来创建命名管道的服务器端。请务必指定非零缓冲区大小，零（MSDN 记录为“使用系统默认缓冲区大小”）不起作用。MSDN为多线程客户端和服务器提供了不错的示例。
回答by Jerry Coffin
A named pipe client can open the named pipe with CreateFile-- but the named pipe server needs to use CreateNamedPipeto create the named pipe. After it's created the named pipe, the server uses ConnectNamedPipeto wait for a client to connect. Only afterthe client has connected should the server do a blocking read like your call to ReadFile.
命名管道客户端可以使用CreateFile--打开命名管道，但命名管道服务器需要使用它CreateNamedPipe来创建命名管道。创建命名管道后，服务器用于ConnectNamedPipe等待客户端连接。只有在客户端连接后，服务器才应该像您调用ReadFile.
