Hi
Not sure if this is a windows or java problem, so posted this on the Oracle Java site as well, but really grateful if anyone can help. On Windows 8.1 Enterprise 64 bit the example below works OK with java 1.7 but errors with java 1.8. On previous windows versions both versions of java appear to work OK.
Created a simple example to reproduce the problem:
Windows 8.1 Enterprise 64 bit running on an Oracle Virtual Box, Visual Studio 2012 Professional, Eclipse Luna 32 bit, 32 bit java 7.65 and 32 bit java 8.45 installed.
Use Vis Studio to create a new C++ project configuration Win32, create a .cpp file and paste the following:
Please note: PIPENAME below is "{backslash}{backslash}{backslash}{backslash}.{backslash}{backslash}pipe{backslash}{backslash}UC_MENU_PIPE"
// PipeSample.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <windows.h>
using namespace std;
#define DEFAULTTIMEOUT 120
#define BUFSIZE 512
int main(int argc, const char **argv)
{
wcout << "Creating an instance of a named pipe..." << endl;
// Create a pipe to send data
HANDLE pipe = CreateNamedPipe( L"PIPENAME", // name of the pipe
PIPE_ACCESS_DUPLEX,
PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT,
1, // only allow 1 instance of this pipe
BUFSIZE,
BUFSIZE,
DEFAULTTIMEOUT,
&sa // use default security attributes
);
if (pipe == NULL || pipe == INVALID_HANDLE_VALUE) {
wcout << "Failed to create outbound pipe instance.";
system("pause");
return 1;
}
wcout << "Waiting for a client to connect to the pipe..." << endl;
// This call blocks until a client process connects to the pipe
BOOL result = ConnectNamedPipe(pipe, NULL);
if (!result) {
wcout << "Failed to make connection on named pipe." << endl;
// look up error code here using GetLastError()
CloseHandle(pipe); // close the pipe
system("pause");
return 1;
}
wcout << "Sending data to pipe..." << endl;
// This call blocks until a client process reads all the data
const wchar_t *data = L"*** Hello Pipe World ***";
DWORD numBytesWritten = 0;
result = WriteFile(
pipe, // handle to our outbound pipe
data, // data to send
wcslen(data) * sizeof(wchar_t), // length of data to send (bytes)
&numBytesWritten, // will store actual amount of data sent
NULL // not using overlapped IO
);
if (result) {
wcout << "Number of bytes sent: " << numBytesWritten << endl;
} else {
wcout << "Failed to send data." << endl;
int pipe_err = GetLastError();
wcout << "GetLastError():
" << pipe_err << endl;
}
// Close the pipe (automatically disconnects client too)
CloseHandle(pipe);
wcout << "Done." << endl;
system("pause");
return 0;
}
Save and build to ensure no errors.
Create a new workbench in Java, set the Project properties to point Compiler and Build Path to jdk 8.45, add a new class called AppletTester and paste the following:
import java.io.File;
import java.io.RandomAccessFile;
import javax.swing.JApplet;
public final class AppletTester extends JApplet implements ISuperRequestFocus {
private static final long serialVersionUID = 1L;
{
try
{
File pipe = new File("PIPENAME");
RandomAccessFile rafile
= new RandomAccessFile(pipe,"rwd");
rafile.close();
}
catch(Exception e)
{
e.printStackTrace();
System.out.println("exception
in run " + e);
}
}
public void superRequestFocus()
{
super.requestFocus();
}
}
interface ISuperRequestFocus
{
public void superRequestFocus();
}
Save and Clean to ensure no problems.
Start the Vis Studio C++ pipe creator.
Start the AppletTester fails to connect. Terminate the Vis Studio C++ pipe creator.
Change AppletTester Properties Compiler and Build Path to jdk 7.65, Clean.
Start the Vis Studio C++ pipe creator.
Start the AppletTester connects OK.
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