Issue passing string[] array as RPC parameter

Merrik
2013-04-15 14:23:04

I noticed something strange with how string[] parameters are handled by RPC's.

When I send an RPC with an empty string[] it tries to find and RPC that takes no arguments. When I send an RPC with a string[] with one element it tries to find and RPC that takes a string.

Sending a string[] with more than 1 element is fine.

Here is my test case:

[code2=csharp]void Start() {

        string[] s0 = { };
        string[] s1 = { "A" };
        string[] s2 = { "A", "B" };
        photonView.RPC("StringRPCTest", PhotonNetwork.player, s0);
        photonView.RPC("StringRPCTest", PhotonNetwork.player, s1);
        photonView.RPC("StringRPCTest", PhotonNetwork.player, s2);
}

[RPC]
void StringRPCTest(string [] stringArray)
{
    Debug.Log("Success: Received StringRPCTest " + stringArray.Length);
}[/code2]

The out put of which is:

PhotonView with ID 4 has no method "StringRPCTest" that takes 0 argument(s): PhotonView with ID 4 has no method "StringRPCTest" that takes 1 argument(s): String Success: Received StringRPCTest 2

Comments

Merrik
2013-04-15 14:31:54

I found a temporary fix in adding an extra parameter

[code2=csharp]void Start() { string[] s0 = { }; photonView.RPC("StringRPCTest", PhotonNetwork.player, s0, 0);

}
[RPC]
void StringRPCTest(string [] stringArray, int pointlessInt)
{
    Debug.Log(" received StringRPCTest " + stringArray.Length);
}[/code2]

Tobias
2013-04-15 15:24:01

The problem are unfortunately the optional parameters of the RPC methods: [code2=csharp]public void RPC(string methodName, PhotonTargets target, params object[] parameters)[/code2]

Usually, they "help" by accepting parameters fitting the ones defined in your RPC. In this case, your string[] simply fits the "list of objects" definition (by accident, so to say). If you passed in a string-array with 4 items, your RPC implementation would have to use 4 string parameters.

To explicitly pass the string[] as single object, use this cast: [code2=csharp]photonView.RPC("StringRPCTest", PhotonNetwork.player, (object)s0);[/code2]

Merrik
2013-04-15 17:43:36

Ah, I see! thanks. That will save me many headaches in the future!

HooDoo
2016-04-30 00:56:53

I am a little bit unclear about this. Can I have an array of floats and send those using RPC?
so...
photonView.RPC("someRPC",targets,(float[])myarray);
...
[PunRPC]
void someRPC(float[] myarray) {
...
}
is this correct?

vadim
2016-05-06 15:22:24

According to what Tobias wrote, you can pass float[] with
photonView.RPC("someRPC",targets,(object)myarray);
This makes compiler use proper overloaded method.