passing structure from tcpserver to client

[aj2903]

hii

struct Stcp
{
  int a;
  float b;
  char [50];
}
 
Stcp sendTcp;

struct Stcp
{
  int a;
  float b;
  char [50];
}

Stcp sendTcp;

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I want to send whole sendTcp from server to client.
Pls help...

[caduel]

Do you *know* that the client is "binary" compatible with the server?
If not, you might have to convert the int from little to big endian...

If that is not an issue:

// assuming your socket is called socket
socket.write(QByteArray::fromRawData(&sendTcp, sizeof(sendTcp)));

// assuming your socket is called socket
socket.write(QByteArray::fromRawData(&sendTcp, sizeof(sendTcp)));

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(You don't need to send the size of that packet, as the size is fix.)

If that is an issue:
construct a QDataStream on the socket, and stream all the members out.
Prefix the packet by the packet size, so the client has a chance to know when the complete packet has been received.

The network-fortuneserver examples shows, how to add the package's size to the package.
The network-fortuneclient shows how to wait til the complete package has been received.

HTH

[jpn]

If both sides are Qt, it might be also worth implementing QDataStream stream operators. See Qt Centre Wiki: [WIKI]Using custom data types with Qt[/WIKI] for more details.

[aj2903]

hii caduel

i'm getting folowing error :

error: no matching function for call to `QByteArray::fromRawData
(sendTcp*, unsigned int)'

Pls help.

[caduel]

You have to cast that pointer to const char*, then it should work.
(Note that jpn is right: if both sides are written by you, then the little work of supporting QDataStream is probably a good idea.)