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New Message on cochindotnet
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From: J.K.
Message 2 in Discussion
Pooja,
Use GetFileType(GetStdHandle(STD_INPUT_HANDLE)) to determine if the
handle belongs to a file, device or pipe...
Have a nice day,
Jayakrishnan K.
<x-tab> </x-tab>
At 12:18 AM 7/10/03 -0700, you wrote:
New Message on
cochindotnet
reading stdin C++ (pipe)
Reply
Reply to Sender Recommend Message 1 in Discussion
From: dolly
Hi ,
I have a program to which I want to be able to pipe to if required.
1)at the command prompt when i say dir|myprog.exe , my program must read the stdin to
get output of dir.
2)if I say myprog.exe , my program should continue execution without waiting for any
input.
I tried
if(!cin.eof())
{
gets(buf);
cout<<"\nStdin = "<<stdin;
cout<<"\nCount="<<stdin->_cnt;
cout<<"\nstdin->_ptr = "<<stdin->_ptr;
}
But this waits for an input because of the gets, so 1 works 2 doesn't
So I tried
char buf[4000];
DWORD bytesRead;
HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
if(ReadFile(h,&buf,4000,&bytesRead,NULL)==0)
cout<<"\nError Reading stdin"<<GetLastError();
cout<<"\nstdin->_ptr = "<<stdin->_ptr;
ReadFile here is also a blocking function, hence 2 wont work.
How can I check for data in stdin without blocking the process, ie if there is data I
proceed with it , else without it
Thanks,
Dolly
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