How to write console login and get console?
I want the user to be able to have some data already in the input stream that they can change. I've looked at the below function, but I'm not sure how to get the Console handle from the Console class.
[DllImport("kernel32", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool WriteConsoleInput(
IntPtr hConsoleInput,
[Out] INPUT_RECORD[] lpBuffer,
int nLength,
out int lpNumberOfEventsWritten);
public static void WriteConsoleInput()
{
UInt32 STD_INPUT_HANDLE = 0xfffffff6;
IntPtr hConsoleInput = GetStdHandle(STD_INPUT_HANDLE);
INPUT_RECORD[] lpBuffer = new INPUT_RECORD[2];
// I tried using uChar (short) as well.
lpBuffer[0].Event.KeyEvent.wVirtualKeyCode = 0x41; // A
lpBuffer[1].Event.KeyEvent.wVirtualKeyCode = 0x5A; // Z
int nLength = lpBuffer.Length;
int lpNumberOfEventsWritten;
if (!WriteConsoleInput(
hConsoleInput,
lpBuffer,
nLength,
out lpNumberOfEventsWritten))
{
// Don't get here.
Console.WriteLine("Error: {0}", GetLastError());
}
} // A breakpoint here shows that lpNumberOfEventsWritten is 2
...
...
...
Console.Write("Input something: ");
WriteConsoleInput();
String input = Console.ReadLine();
Console.WriteLine("input = {0}", input);
I can't see anything on the screen for "Entering something". If I just hit enter, enter a blank line.
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2 answers
Rather than mixing managed and unmanaged (which can mess up assumptions System.Console
), I would suggest just using P / Invoke all the way.
There is an example on MSDN: http://msdn.microsoft.com/library/ms685035
0
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It works?
public class ConsoleHandles
{
private const uint STD_INPUT_HANDLE = 0xfffffff6;
private const uint STD_OUTPUT_HANDLE = 0xfffffff5;
private const uint STD_ERROR_HANDLE = 0xfffffff4;
[DllImport("kernel32.dll")]
private static extern int GetStdHandle(uint nStdHandle);
public Int32 Stdin { get { return GetStdHandle(STD_INPUT_HANDLE ); } }
//etc
}
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