Programming Forums > Application Development > C++

prototype_angel · Jan 2nd, 2008, 1:35 AM

Hi, I have a situation where I've got some programs communicating via sockets. They can only send strings to each other.
so if I try this:

 c++ Syntax (Toggle Plain Text) 
struct mystruct
{
int a, b, c;
char a,b,c;
int array[10];
someotherclass object;
}
 
char *encode2(mystruct a)//method 2
{
char *ret,*ret1;
ret=new char[sizeof(a)];
ret[sizeof(a)]=NULL;
ret=&a;
strcpy(ret1,ret);
}
 
mystruct decode(char *a)
{
//please help me with this
}
struct mystruct
{
int a, b, c;
char a,b,c;
int array[10];
someotherclass object;
}

char *encode2(mystruct a)//method 2
{
char *ret,*ret1;
ret=new char[sizeof(a)];
ret[sizeof(a)]=NULL;
ret=&a;
strcpy(ret1,ret);
}

mystruct decode(char *a)
{
//please help me with this
}

Essentially i can only send a string and have two processes of the same program sending and reciving the same struct, so the structure of the memory will be preserved.

can someone suggest a way to efficiently do this and it should work for zero values in arrays and integers.

Thanks a lot in advance
prototype_angel

Salem · Jan 2nd, 2008, 1:59 AM

http://www.parashift.com/c++-faq-lit...alization.html

prototype_angel · Jan 2nd, 2008, 2:20 AM

That was useful. thanks.

Game_Ender · Jan 2nd, 2008, 3:26 AM

You can also use Boost.Serialization. It will handle all that work for you. Its lets you chose text, binary, or xml output. If you are on windows, you can get installers for boost here. See the tutorial, it will help you write a simple to way serialization function. You will then be able to dump the struct to a string and build the struct back from the string.

Its text format will help you avoid endian and struct data member alignment issues which you appear to be ignoring here.

Jan 2nd, 2008, 1:35 AM	#1
prototype_angel Newbie Join Date: Dec 2006 Posts: 9 Rep Power: 0	how to encode a struct in a string for communication (c++)(pointers) Hi, I have a situation where I've got some programs communicating via sockets. They can only send strings to each other. so if I try this: c++ Syntax (Toggle Plain Text) struct mystruct { int a, b, c; char a,b,c; int array[10]; someotherclass object; } char encode2(mystruct a)//method 2 { char ret,ret1; ret=new char[sizeof(a)]; ret[sizeof(a)]=NULL; ret=&a; strcpy(ret1,ret); } mystruct decode(char a) { //please help me with this } struct mystruct { int a, b, c; char a,b,c; int array[10]; someotherclass object; } char encode2(mystruct a)//method 2 { char ret,ret1; ret=new char[sizeof(a)]; ret[sizeof(a)]=NULL; ret=&a; strcpy(ret1,ret); } mystruct decode(char a) { //please help me with this } Essentially i can only send a string and have two processes of the same program sending and reciving the same struct, so the structure of the memory will be preserved. can someone suggest a way to efficiently do this and it should work for zero values in arrays and integers. Thanks a lot in advance prototype_angel

Jan 2nd, 2008, 1:59 AM	#2
Salem Programmer Join Date: Nov 2007 Posts: 33 Rep Power: 0	Re: how to encode a struct in a string for communication (c++)(pointers) http://www.parashift.com/c++-faq-lit...alization.html __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.

Jan 2nd, 2008, 2:20 AM	#3
prototype_angel Newbie Join Date: Dec 2006 Posts: 9 Rep Power: 0	Re: how to encode a struct in a string for communication (c++)(pointers) That was useful. thanks.

Jan 2nd, 2008, 3:26 AM	#4
Game_Ender Professional Programmer Join Date: May 2006 Location: Maryland, USA Posts: 306 Rep Power: 3	Re: how to encode a struct in a string for communication (c++)(pointers) You can also use Boost.Serialization. It will handle all that work for you. Its lets you chose text, binary, or xml output. If you are on windows, you can get installers for boost here. See the tutorial, it will help you write a simple to way serialization function. You will then be able to dump the struct to a string and build the struct back from the string. Its text format will help you avoid endian and struct data member alignment issues which you appear to be ignoring here. __________________ Robotics @ Maryland AUV Team - Software Lead

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Programming Forums > Application Development > C++

how to encode a struct in a string for communication (c++)(pointers)