static void Main(string[] args)
{
SafeMailslotHandle hMailslot = null;
try
{
// Try to open the mailslot with the write access.
hMailslot = NativeMethod.CreateFile(
MailslotName, // The name of the mailslot
FileDesiredAccess.GENERIC_WRITE, // Write access
FileShareMode.FILE_SHARE_READ, // Share mode
IntPtr.Zero, // Default security attributes
FileCreationDisposition.OPEN_EXISTING, // Opens existing mailslot
0, // No other attributes set
IntPtr.Zero // No template file
);
if (hMailslot.IsInvalid)
{
throw new Win32Exception();
}
Console.WriteLine("The mailslot ({0}) is opened.", MailslotName);
// Write messages to the mailslot.
// Append '\0' at the end of each message considering the native C++
// Mailslot server (CppMailslotServer).
WriteMailslot(hMailslot, "Message 1 for mailslot\0");
WriteMailslot(hMailslot, "Message 2 for mailslot\0");
Thread.Sleep(3000); // Sleep for 3 seconds for the demo purpose
WriteMailslot(hMailslot, "Message 3 for mailslot\0");
}
catch (Win32Exception ex)
{
Console.WriteLine("The client throws the error: {0}", ex.Message);
}
finally
{
if (hMailslot != null)
{
hMailslot.Close();
hMailslot = null;
}
}
}
static void Main(string[] args)
{
SafeMailslotHandle hMailslot = null;
try
{
// Prepare the security attributes (the lpSecurityAttributes parameter
// in CreateMailslot) for the mailslot. This is optional. If the
// lpSecurityAttributes parameter of CreateMailslot is NULL, the
// mailslot gets a default security descriptor and the handle cannot
// be inherited. The ACLs in the default security descriptor of a
// mailslot grant full control to the LocalSystem account, (elevated)
// administrators, and the creator owner. They also give only read
// access to members of the Everyone group and the anonymous account.
// However, if you want to customize the security permission of the
// mailslot, (e.g. to allow Authenticated Users to read from and
// write to the mailslot), you need to create a SECURITY_ATTRIBUTES
// structure.
SECURITY_ATTRIBUTES sa = null;
sa = CreateMailslotSecurity();
// Create the mailslot.
hMailslot = NativeMethod.CreateMailslot(
MailslotName, // The name of the mailslot
0, // No maximum message size
MAILSLOT_WAIT_FOREVER, // Waits forever for a message
sa // Mailslot security attributes
);
if (hMailslot.IsInvalid)
{
throw new Win32Exception();
}
Console.WriteLine("The mailslot ({0}) is created.", MailslotName);
// Check messages in the mailslot.
Console.Write("Press ENTER to check new messages or press Q to quit ...");
string cmd = Console.ReadLine();
while (!cmd.Equals("Q", StringComparison.OrdinalIgnoreCase))
{
Console.WriteLine("Checking new messages...");
ReadMailslot(hMailslot);
Console.Write("Press ENTER to check new messages or press Q to quit ...");
cmd = Console.ReadLine();
}
}
catch (Win32Exception ex)
{
Console.WriteLine("The server throws the error: {0}", ex.Message);
}
finally
{
if (hMailslot != null)
{
hMailslot.Close();
hMailslot = null;
}
}
}