Programming Forums > Application Development > C#

JD-Salinger · Aug 2nd, 2008, 2:28 PM

i have to call a native function in c++, the puts(), i compiled the program but it doesnt output the string parameter?
but just pure blank

 c# Syntax (Toggle Plain Text) 
using System;
using System.Runtime.InteropServices;
 
class PlatformInvokeTest
{
    [method: DllImport("msvcrt.dll")]
    static extern string puts(string x);
    static void Main()
    {
 
        puts("Hello World!");
       Console.ReadKey();
 
    }
}
using System;
using System.Runtime.InteropServices;

class PlatformInvokeTest
{
    [method: DllImport("msvcrt.dll")]
    static extern string puts(string x);
    static void Main()
    {

        puts("Hello World!");
       Console.ReadKey();
       
    }
}

sarehu · Aug 2nd, 2008, 3:13 PM

Try calling the native C code, fflush(stdout). It could be that the C standard library's output stream is not getting flushed, because Console.ReadKey() doesn't care or know about that. If you asked for input using a standard C stdin function, i.i.r.c. it would flush the stdout stream automatically. The C# standard input functions probably flush the C# standard output buffer, and don't know anything about the C output buffer, which means you have to flush it manually.

Maybe. Anyway, try it.

lectricpharaoh · Aug 2nd, 2008, 7:12 PM

Your code works fine for me exactly as is. But yeah, try flushing stdout, to ensure it actually writes any buffered output.

JD-Salinger · Aug 2nd, 2008, 10:43 PM

thank you thank you thank you!!!

Aug 2nd, 2008, 2:28 PM	#1
JD-Salinger Unknown Join Date: Apr 2008 Location: unknown Posts: 87 Rep Power: 1	calling native functions i have to call a native function in c++, the puts(), i compiled the program but it doesnt output the string parameter? but just pure blank c# Syntax (Toggle Plain Text) using System; using System.Runtime.InteropServices; class PlatformInvokeTest { [method: DllImport("msvcrt.dll")] static extern string puts(string x); static void Main() { puts("Hello World!"); Console.ReadKey(); } } using System; using System.Runtime.InteropServices; class PlatformInvokeTest { [method: DllImport("msvcrt.dll")] static extern string puts(string x); static void Main() { puts("Hello World!"); Console.ReadKey(); } } __________________ ------------------------------------------------------------------------- I thought what I'd Do was, I'd pretend to be one of those deaf mutes ------------------------------------------------------------------------

Aug 2nd, 2008, 3:13 PM	#2
sarehu Newbie Join Date: Aug 2008 Posts: 5 Rep Power: 0	Re: calling native functions Try calling the native C code, `fflush(stdout)`. It could be that the C standard library's output stream is not getting flushed, because `Console.ReadKey()` doesn't care or know about that. If you asked for input using a standard C stdin function, i.i.r.c. it would flush the stdout stream automatically. The C# standard input functions probably flush the C# standard output buffer, and don't know anything about the C output buffer, which means you have to flush it manually. Maybe. Anyway, try it.

Aug 2nd, 2008, 7:12 PM	#3
lectricpharaoh SEXY SHOELESS GOD OF WAR! Join Date: Jun 2005 Location: Wet west coast of Canada Posts: 1,197 Rep Power: 5	Re: calling native functions Your code works fine for me exactly as is. But yeah, try flushing stdout, to ensure it actually writes any buffered output. __________________ And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot. - Vaarsuvius, Order of the Stick

Aug 2nd, 2008, 10:43 PM	#4
JD-Salinger Unknown Join Date: Apr 2008 Location: unknown Posts: 87 Rep Power: 1	Re: calling native functions thank you thank you thank you!!! __________________ ------------------------------------------------------------------------- I thought what I'd Do was, I'd pretend to be one of those deaf mutes ------------------------------------------------------------------------

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Programming Forums > Application Development > C#

calling native functions