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New Message on BDOTNET
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From: spark
Message 1 in Discussion
Hi,
this is your weekend
take home :)
I
had some free time in office today so i thought i'd write some code, wrote
myself a media player to rival microsoft's media player :)) (or something like
that... ).
The player is
actually a console to the media control interface within your windows system and
you send the media interface commands in text - just like a command prompt ...
this is one more of those many lesser know things in your alice-in-wonder...
(oops ) operating system.
I
thought i'd give you code to show how this happens: the src is 2 files, one cpp
and one cs (c#). both files have their compilation commands
given.
//filename:
mci.cpp
//compile: cl /LD mci.cpp /link winmm.lib kernel32.lib
#include
<windows.h>
#include <stdio.h>
#define PATH
1024
extern "C"
__declspec(dllexport)
int mci(char * str,char * resp)
{
int
ret;
//convert one "" region to ShortPath to help
//out poor MCI's long path parsing capabilities
char * p =
str, *s;
char short_path[PATH];
s=0;
while(*p
&& *p !='\"') p++;
if(*p)
{
s =
p+1;
while(*s && *s!='\"') s++;
}
if(*p
&& s && *s)
{
*p = *s =
0;
GetShortPathName(p+1,short_path,PATH);
//i
assume somethings about path sizes for this sprintf
...
sprintf(str,"%s %s
%s",str,short_path,s+1);
printf("#>%s\n",str);
}
//the
now good stuff
if( ret =
mciSendString(str,0,0,0))
mciGetErrorString(ret,resp,2048);
return
ret;
}
and the c#
//filename:
mci.cs
//compile: csc mci.cs
using System;
using System.Text;
using
System.Runtime.InteropServices;
class
Mci
{
[DllImport("mci.dll")]
static extern int mci(string
cmd,StringBuilder sb);
static void
Main()
{
Console.WriteLine("MCI Console/Player - Roshan
James (1 Aug 2003)\ntype \"exit\" to quit");
StringBuilder sb =
new StringBuilder(2050);
string cmd;
int
ret;
while(true)
{
Console.Write("mci>");
cmd
= Console.ReadLine();
if(cmd ==
"exit") break;
else if((ret=mci(cmd,sb)) !=
0)
Console.WriteLine("{0}:
{1}",ret,sb.ToString());
}
}
}
So this code creates
a mci.dll in cpp and interops with it in c# and interface with win32api , this
case mci (mostly). In some senses this is proof of concept of somethings which
some folk still stay doubtful.
You can use the src
in this mail and compile it out yourself or if you are lazy download it from
here :
http://www27.brinkster.com/sparksite/downloads/mci_src_and_bin.zip
So how do you use
this ?
To play use this
command
play <filename>
To stop
stop <filename>
simple ? there are
lost more...
get a the full
command list for the program here :
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/mmcmdstr_4nub.asp
want to adjust sound quality ... take a look
at the 'quality' command.
if its tedious to
type the file name, simply drap and drop the file name into the command line.
those on win2k and
higher will notice that your F7 key will work :)
examples:
play
"D:\music\assorted\Robbie Williams - Supreme.mp3"
stop "D:\music\assorted\Robbie Williams -
Supreme.mp3"
try not to
under-estimate it too much... after all it can play most music file types, play
video .. and (ahem) maybe capture stuff from a video device like a
vcr...
/*as a foot note,
this has been there in windows for a long while... anyone who has used my old
netshortcut (http://www27.brinkster.com/sparksite/netshortcut/netshortcut.htm)
(written in vc++/mfc) might have noticed a the mci command: the same mci
interface.*/
cheers
roshan
ps. bdotnet-ers: if
there is time, maybe during my command line session the coming friday i
will demo mci for you
pps. so much for
ethical computing, apologies, i know i am showing off
mp3s...
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