我想了解命名管道是如何工作的,並創建了2個控制檯來測試服務器和客戶端之間的連接。客戶端將向服務器發送消息,服務器將顯示消息,但不是消息,而是返回值爲「nullptr」,如VS的錯誤異常中斷所示。命名管道問題
下面是我的代碼,做開導我,如果你發現我的代碼的任何問題,我仍然在學習..
Server.cpp
#include "cust_ostream.hpp"
#include <Windows.h>
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
LPVOID buffer = NULL;
DWORD readbyte;
cout << "---Named Pipe Server Test---" << endl << endl;
cout << "Creating named pipe: \\\\.\\pipe\\mypipe" << endl;
HANDLE hPipe = CreateNamedPipeA("\\\\.\\pipe\\mypipe", PIPE_ACCESS_DUPLEX, PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,
PIPE_UNLIMITED_INSTANCES, 1024, 1024, 0, NULL);
if (!hPipe || hPipe == INVALID_HANDLE_VALUE)
{
cout << "Pipe creation failed." << endl;
return 0;
}
cout << "Connecting pipe to client..." << endl;
BOOL connect = ConnectNamedPipe(hPipe, NULL);
if (!connect)
{
cout << "Connect named pipe failed" << endl;
}
cout << "Success! Reading pipe message from client..." << endl;
ReadFile(hPipe, buffer, sizeof(buffer), &readbyte, NULL);
c_cout << "Pipe message = " << *(int *)buffer << endl;
_getch();
return 0;
}
cust_ostream.hpp
#include <Windows.h>
#include <iostream>
#include <sstream>
using namespace std;
#define endl "\n"
class cust_ostream
{
public:
~cust_ostream()
{
cout << m_buffer.str();
}
template <typename T>
cust_ostream &operator<<(T const &value)
{
m_buffer << value;
return *this;
}
private:
ostringstream m_buffer;
};
#define c_cout cust_ostream()
and my client
#include <Windows.h>
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
LPVOID data;
DWORD writebyte;
int i = 2;
cout << "---Named Pipe Client---" << endl << endl;
cout << "Creating pipe file: \\\\.\\pipe\\mypipe" << endl;
HANDLE pipe = CreateFileA("\\\\.\\pipe\\mypipe", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (!pipe || pipe == INVALID_HANDLE_VALUE)
{
cout << "Pipe client failed." << endl;
return 0;
}
cout << "Pipe connected to server, sending data..." << endl;
WriteFile(pipe, &i, sizeof(i), &writebyte, NULL);
_getch();
return 0;
}
'緩衝區'爲空。你從來沒有給它分配過任何東西,所以'nullptr'異常正是你所期望的。分配一些內存並將其分配給「緩衝區」或僅使用預分配的數組。 –
我的天哪,我錯過了!感謝您指出@CareyGregory。 – ReverseEngineer