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Re: [lwip-users] Sending out TCP-Data as integer type

From: Bill Auerbach
Subject: Re: [lwip-users] Sending out TCP-Data as integer type
Date: Wed, 5 Dec 2012 16:11:33 -0500



From: address@hidden [mailto:address@hidden On Behalf Of Firedog I.
Sent: Wednesday, December 05, 2012 9:38 AM
To: address@hidden
Subject: [lwip-users] Sending out TCP-Data as integer type


Hi everyone,


I got a little problem over here. I can send simple TCP-Data like string and char, but I can’t send data as integer type. I’m using lwIP v1.36 with RAW API.




/*Connection to Client established…*/

int data = "" //or int data = "">

tcp_write(pcb, data, 1, 1);


tcp_write 2nd param is a void * arg – a pointer.  So you want:




but then using an int could be a problem depending on the platform.  Always best to use bytes (chars).


char data = "">



should do it.  If you were to change data to an array of chars, then:


char data[] = { 0xFF };

tcp_write(pcb,&data,sizeof data,1);


is better still. And you can add bytes to the initializer for data[] without changing any other code.






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