C++中的NamedPipeClientStream StreamReader问题
当使用 .net NamedPipeClientStream 类从 NamedPipes 服务器读取数据时，我只能在 C++ 中第一次读取时获取数据，每次它只是一个空字符串。在 C# 中它每次都有效。
pipeClient = gcnew NamedPipeClientStream(".", "Server_OUT", PipeDirection::In);
try
{
pipeClient->Connect();
}
catch(TimeoutException^ e)
{
// swallow
}
StreamReader^ sr = gcnew StreamReader(pipeClient);
String^ temp;
while (temp = sr->ReadLine())
{
// = sr->ReadLine();
Console::WriteLine("Received from server: {0}", temp);
}
sr->Close();
When reading from a NamedPipes server using the .net NamedPipeClientStream class I can only get the data on the first read in C++, every time it's just an empty string. In c# it works every time.
pipeClient = gcnew NamedPipeClientStream(".", "Server_OUT", PipeDirection::In);
try
{
pipeClient->Connect();
}
catch(TimeoutException^ e)
{
// swallow
}
StreamReader^ sr = gcnew StreamReader(pipeClient);
String^ temp;
while (temp = sr->ReadLine())
{
// = sr->ReadLine();
Console::WriteLine("Received from server: {0}", temp);
}
sr->Close();
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该问题与 C++ 空终止符有关。 NamedPipes 服务器正在发送例如
"Hello World!\n\0"
在第一次传递时，这将发送
"Hello World!\n" 留下 \0 在管道中。在后续发送中，它将传输
"\0Hello World!\n"
C# 将获取整个字符串，而 c++ 将在 \0 字符处终止字符串。
The problem was related to C++ null terminator. The NamedPipes Server was sending for example
"Hello World!\n\0"
On the first pass this would send
"Hello World!\n" leaving \0 in the pipe. On subsequents sends it would tranmit
"\0Hello World!\n"
C# would get the whole string while c++ would terminate the string at the \0 char.