cant = getnetworkmessage(message) // to work =(

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Vladimuffin

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Posted: 18th Jul 2018 01:28 Edited at: 18th Jul 2018 01:30

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Hey guys. I have been building momentum and learning a lot about coding lately,until I hit this bump in the road. I am using Hughbus' magical PyxelLoader.agc to make a multiplayer wifi game. I can get host player to load the level, then I send a message using the following to tell clients which map to load.

+ Code Snippet

if hosting = 1 and GetNetworkExists(NetworkID) <> 0
	message = CreateNetworkMessage()
	AddNetworkMessageFloat(message, level#)
	SendNetworkMessage(NetworkID, 0, message)
endif

the client needs to know which map to load, so I am using

+ Code Snippet

if startload = 1 and hosting = 0					//if you are a joining client, this checks for successful connection

	 if IsNetworkActive(NetworkID) <> 0
			playerID = GetNetworkNextClient(NetworkID)
			print(GetNetworkMyClientID(NetworkID))
		if level# = 0
			message = GetNetworkMessage(networkID)
			level# = GetNetworkMessageFloat(message)
			DeleteNetworkMessage(message)
		endif
		
	
	if level# <> 0 then startload = 4     //startload 4 is the map building function
	endif
	print("level: " + str(level#))
	print(IsNetworkActive(NetworkID))
			
endif

Im getting an error that the message ID 0 does not exist. Before trying this I was using the bit from the AppGameKit example:

+ Code Snippet

message = GetNetworkMessage ( NetworkID )
while message <> 0 
    // get data from message
   level# = GetNetworkMessageFloat ( message )

    // delete the current message as it is no longer needed
    DeleteNetworkMessage ( message )


    // find the next message
    message = GetNetworkMessage ( NetworkID )
print("level: " + str(level#))
endwhile

level always printed as 0. I cant really share the whole code on the forum because its a hefty bit, but maybe someone can enlighten me on my messaging error. As always, I appreciate any help or advice offered. You guys are the best! I tried researching this on my own but couldnt find much about sending and receiving simple messages aside from the AppGameKit example.

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Vladimuffin

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Posted: 18th Jul 2018 01:37

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Another thing I just thought about, Im using the pc and an android phone to test the network. Do I need to use two computers or two devices?

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Vladimuffin

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Posted: 18th Jul 2018 04:54 Edited at: 18th Jul 2018 04:54

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Dunno guys, this is the whole startup. Im still hitting a wall... message is always 0 on guest client's screen X_x

startmenu:
if startload = 0		//startload 1 is the first screen you see, with Host or Join option
	AddVirtualButton(1, centerx, 300, 100)
	CreateText(1, "Host Game")
	SetTextSize(1, 75)
	SetTextPosition(1, centerx - (GetTextTotalWidth(1)/2), 175)
	AddVirtualButton(2, centerx, 500, 100)
	CreateText(2, "Join Game")
	SetTextSize(2, 75)
	SetTextPosition(2, centerx - (GetTextTotalWidth(2)/2), 375)
	startload = 1
	hosting = 1
endif

if startload = 1		//startload 1 means you have selected either to host or to join
	if GetVirtualButtonPressed(1) = 1	//you have pressed the host button, 
		deletetext(1)
		DeleteText(2)
		DeleteVirtualButton(1)
		DeleteVirtualButton(2)
		NetworkID = HostNetwork("TagNet", "Host", 44445)
		playerID = GetNetworkFirstClient(NetworkID)
		hosting = 1
		startload = 2
	endif
endif
if startload = 1	
	if GetVirtualButtonPressed(2) = 1		//you have pressed the join network button
		NetworkID = JoinNetwork("TagNet", "client")				//joins TagNet network
		hosting = 0				//you are not a host (will be used for recieveing messages)
	endif
endif
	
if startload = 1 and hosting = 0					//if you are a joining client, this checks for successful connection
print("is network active? :" + str(IsNetworkActive(NetworkID)))
	 if IsNetworkActive(NetworkID) <> 0
		playerID = GetNetworkNextClient(NetworkID)
		
		message = GetNetworkMessage(NetworkID)
			if message <> 0
			
			level = GetNetworkMessageinteger(message)
			DeleteNetworkMessage(message)
			
			message = GetNetworkMessage(NetworkID)
		endif
		
	
		if level <> 0 then startload = 4
	endif
	print("level: " + str(level))
			
endif

if startload = 2			//startload 2 is only seen by host, creates buttons for level select
	CreateText(8, "SELECT STAGE")
	SetTextSize(8, 100)
	SetTextPosition(8, centerx - (GetTextTotalWidth(8)/2), 50)
	
	AddVirtualButton(1, swidth * .25, 300, 100)
	CreateText(1, "Concrete Jungle")
	SetTextSize(1, 30)
	SetTextPosition(1, (swidth * .25) - (GetTextTotalWidth(1) / 2), 200)
	
	AddVirtualButton(2, swidth * .50, 300, 100)
	CreateText(2, "Junk Yard")
	settextsize(2, 30)
	SetTextPosition(2, (swidth * .50) - (GetTextTotalWidth(2) / 2), 200)
	AddVirtualButton(3, swidth * .75, 300, 100)
	
	AddVirtualButton(4, swidth * .25, 600, 100)
	AddVirtualButton(5, swidth * .50, 600, 100)
	AddVirtualButton(6, swidth * .75, 600, 100)

AddVirtualButton(7, 100, sheight - 100, 100)		//this will be the back button
	startload = 3			//once buttons are loaded we go to startload 3
endif

if startload = 3			//startload 3 is data for level buttons on screen
	if GetVirtualButtonPressed(1) = 1		//button 1 selects level 1 (concrete jungle)
		level = 1			
		startload = 4		
	endif
	
	if GetVirtualButtonPressed(2) = 1		//bytton 2 selects level 2 (junk yard)
		level = 2		
		startload = 4
	endif
endif

if startload = 4	//startload 4 removes buttons for host then loads selected level. startload just loads level sent by host
	for i = 1 to 10
		if GetVirtualButtonExists(i) = 1 then DeleteVirtualButton(i)
		if GetTextExists(i) = 1 then deletetext(i)		
	next i
	
	if level = 1
				//Load a map file
		Map01 as tileMapType
		Map01 = loadMap( "Level1.json" )

//Create Tileset for loaded map from an image
		tileset01 as tilesetType
		tileset01 = createTileset( "Level1.png", Map01.tilewidth, 0 )

//draw the Map
		Map01 = createMap( Map01, tileset01, 4 )
	endif
		
	if level = 2
		//Load a map file
		Map02 as tileMapType
		Map02 = loadMap( "Level2.json" )

//Create Tileset for loaded map from an image
		tileset02 as tilesetType
		tileset02 = createTileset( "Level2.png", Map02.tilewidth, 0 )

//draw the Map
		Map02 = createMap( Map02, tileset02, 4 )
	endif
	
		
	startload = 5
endif

if startload = 5
	
	SetViewZoomMode(1)
	setviewzoom(.25)
	SetViewOffset(640, 640)
	
	//player will select character to use and team if applicable
	startload = 6
endif

if startload = 6
	if hosting = 1 and level > 0
		message = CreateNetworkMessage()
		AddNetworkMessageinteger(message, level)
		SendNetworkMessage(NetworkID, 0, message)
		print("sending message")
	endif
endif

return

+ Code Snippet

startmenu:
if startload = 0		//startload 1 is the first screen you see, with Host or Join option
	AddVirtualButton(1, centerx, 300, 100)
	CreateText(1, "Host Game")
	SetTextSize(1, 75)
	SetTextPosition(1, centerx - (GetTextTotalWidth(1)/2), 175)
	AddVirtualButton(2, centerx, 500, 100)
	CreateText(2, "Join Game")
	SetTextSize(2, 75)
	SetTextPosition(2, centerx - (GetTextTotalWidth(2)/2), 375)
	startload = 1
	hosting = 1
endif

if startload = 1		//startload 1 means you have selected either to host or to join
	if GetVirtualButtonPressed(1) = 1	//you have pressed the host button, 
		deletetext(1)
		DeleteText(2)
		DeleteVirtualButton(1)
		DeleteVirtualButton(2)
		NetworkID = HostNetwork("TagNet", "Host", 44445)
		playerID = GetNetworkFirstClient(NetworkID)
		hosting = 1
		startload = 2
	endif
endif
if startload = 1	
	if GetVirtualButtonPressed(2) = 1		//you have pressed the join network button
		NetworkID = JoinNetwork("TagNet", "client")				//joins TagNet network
		hosting = 0				//you are not a host (will be used for recieveing messages)
	endif
endif
	
if startload = 1 and hosting = 0					//if you are a joining client, this checks for successful connection
print("is network active? :" + str(IsNetworkActive(NetworkID)))
	 if IsNetworkActive(NetworkID) <> 0
		playerID = GetNetworkNextClient(NetworkID)
		
		message = GetNetworkMessage(NetworkID)
			if message <> 0
			
			level = GetNetworkMessageinteger(message)
			DeleteNetworkMessage(message)
			
			message = GetNetworkMessage(NetworkID)
		endif
		
	
		if level <> 0 then startload = 4
	endif
	print("level: " + str(level))
			
endif
	



if startload = 2			//startload 2 is only seen by host, creates buttons for level select
	CreateText(8, "SELECT STAGE")
	SetTextSize(8, 100)
	SetTextPosition(8, centerx - (GetTextTotalWidth(8)/2), 50)
	
	AddVirtualButton(1, swidth * .25, 300, 100)
	CreateText(1, "Concrete Jungle")
	SetTextSize(1, 30)
	SetTextPosition(1, (swidth * .25) - (GetTextTotalWidth(1) / 2), 200)
	
	AddVirtualButton(2, swidth * .50, 300, 100)
	CreateText(2, "Junk Yard")
	settextsize(2, 30)
	SetTextPosition(2, (swidth * .50) - (GetTextTotalWidth(2) / 2), 200)
	AddVirtualButton(3, swidth * .75, 300, 100)
	
	AddVirtualButton(4, swidth * .25, 600, 100)
	AddVirtualButton(5, swidth * .50, 600, 100)
	AddVirtualButton(6, swidth * .75, 600, 100)

	AddVirtualButton(7, 100, sheight - 100, 100)		//this will be the back button
	startload = 3			//once buttons are loaded we go to startload 3
endif

if startload = 3			//startload 3 is data for level buttons on screen
	if GetVirtualButtonPressed(1) = 1		//button 1 selects level 1 (concrete jungle)
		level = 1			
		startload = 4		
	endif
	
	if GetVirtualButtonPressed(2) = 1		//bytton 2 selects level 2 (junk yard)
		level = 2		
		startload = 4
	endif
endif


if startload = 4	//startload 4 removes buttons for host then loads selected level. startload just loads level sent by host
	for i = 1 to 10
		if GetVirtualButtonExists(i) = 1 then DeleteVirtualButton(i)
		if GetTextExists(i) = 1 then deletetext(i)		
	next i
	
	if level = 1
				//Load a map file
		Map01 as tileMapType
		Map01 = loadMap( "Level1.json" )

		//Create Tileset for loaded map from an image
		tileset01 as tilesetType
		tileset01 = createTileset( "Level1.png", Map01.tilewidth, 0 )

		//draw the Map
		Map01 = createMap( Map01, tileset01, 4 )
	endif
		
	if level = 2
		//Load a map file
		Map02 as tileMapType
		Map02 = loadMap( "Level2.json" )

		//Create Tileset for loaded map from an image
		tileset02 as tilesetType
		tileset02 = createTileset( "Level2.png", Map02.tilewidth, 0 )

		//draw the Map
		Map02 = createMap( Map02, tileset02, 4 )
	endif
	
		
	startload = 5
endif

if startload = 5
	
	SetViewZoomMode(1)
	setviewzoom(.25)
	SetViewOffset(640, 640)
	
	//player will select character to use and team if applicable
	startload = 6
endif

if startload = 6
	if hosting = 1 and level > 0
		message = CreateNetworkMessage()
		AddNetworkMessageinteger(message, level)
		SendNetworkMessage(NetworkID, 0, message)
		print("sending message")
	endif
endif

return

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smallg

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Posted: 18th Jul 2018 15:13 Edited at: 18th Jul 2018 15:15

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After you check for GetNetworkMessage() you need to check it (in your case "message") isn't 0 before you try to read data from it, otherwise it will be trying to read a message that doesn't exist and thus you get the error.

if IsNetworkActive(NetworkID) <> 0
playerID = GetNetworkNextClient(NetworkID)
print(GetNetworkMyClientID(NetworkID))
if level# = 0
message = GetNetworkMessage(networkID)
if message > 0
level# = GetNetworkMessageFloat(message)
DeleteNetworkMessage(message)
endif
endif

Hope that makes sense (on phone ATM so sorry if it doesn't format correctly)

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Vladimuffin

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Posted: 18th Jul 2018 19:38

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So, it looks like the problem may be the connection, not the message. I added the following...

+ Code Snippet

if GetNetworkExists(NetworkID) > 0 then print("players connected: " + str(GetNetworkNumClients(NetworkID)))

when the guest client connects it shows 2 players connected, but the host only says 1 player. Should the host only send the message once, or should it push that same message out continuously? Sorry for being so green guys, but this is my first time dabbling with network stuff.

i did add your code smallg, and it seems to make sense. Still not getting the message on the guest client though. I did just realize that I declared hosting = 1 in the very first if statement, which is a problem. fixed it but it wasnt a miracle cure.

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Vladimuffin

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Posted: 18th Jul 2018 22:36 Edited at: 18th Jul 2018 22:39

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This post has been marked by the post author as the answer.

well I wiped everything and rewrote it from scratch. I did everything the same, and its sending the message now. This makes me realize I have no clue what Im doing, but its working... LoL

startmenu:
if startload = 0		//startload 1 is the first screen you see, with Host or Join option
	AddVirtualButton(1, centerx, 300, 100)
	CreateText(1, "Host Game")
	SetTextSize(1, 75)
	SetTextPosition(1, centerx - (GetTextTotalWidth(1)/2), 175)
	AddVirtualButton(2, centerx, 500, 100)
	CreateText(2, "Join Game")
	SetTextSize(2, 75)
	SetTextPosition(2, centerx - (GetTextTotalWidth(2)/2), 375)
	startload = 1
	hosting = 1
	NetworkID = 0
	level = 0
endif

if startload = 1		//startload 1 means you have selected either to host or to join
	if GetVirtualButtonPressed(1) = 1	//you have pressed the host button, 
		deletetext(1)
		DeleteText(2)
		DeleteVirtualButton(1)
		DeleteVirtualButton(2)
		NetworkID = HostNetwork("TagNet", "Player 1", 44445)
		hosting = 1
		startload = 2
	endif
endif

if startload = 1	
	if GetVirtualButtonPressed(2) = 1		//you have pressed the join network button
		NetworkID = JoinNetwork("TagNet", "Player 2")				//joins TagNet network
		hosting = 0				//you are not a host (will be used for recieveing messages)
		startload = 4
	endif
endif

if startload = 2			//startload 2 is only seen by host, creates buttons for level select
	CreateText(8, "SELECT STAGE")
	SetTextSize(8, 100)
	SetTextPosition(8, centerx - (GetTextTotalWidth(8)/2), 50)
	
	AddVirtualButton(1, swidth * .25, 300, 100)
	CreateText(1, "Concrete Jungle")
	SetTextSize(1, 30)
	SetTextPosition(1, (swidth * .25) - (GetTextTotalWidth(1) / 2), 200)
	
	AddVirtualButton(2, swidth * .50, 300, 100)
	CreateText(2, "Junk Yard")
	settextsize(2, 30)
	SetTextPosition(2, (swidth * .50) - (GetTextTotalWidth(2) / 2), 200)
	AddVirtualButton(3, swidth * .75, 300, 100)
	
	AddVirtualButton(4, swidth * .25, 600, 100)
	AddVirtualButton(5, swidth * .50, 600, 100)
	AddVirtualButton(6, swidth * .75, 600, 100)

AddVirtualButton(7, 100, sheight - 100, 100)		//this will be the back button
	startload = 3			//once buttons are loaded we go to startload 3
endif

if startload = 3			//startload 3 is data for level buttons on screen
	if GetVirtualButtonPressed(1) = 1		//button 1 selects level 1 (concrete jungle)
		level = 1			
		startload = 4		
	endif
	
	if GetVirtualButtonPressed(2) = 1		//bytton 2 selects level 2 (junk yard)
		level = 2		
		startload = 4
	endif
endif

if GetNetworkExists(NetworkID)			//guests recieve level data from host before loading map
if startload = 4 and IsNetworkActive ( NetworkID ) <> 0
	id = GetNetworkFirstClient ( NetworkID )

while id <> 0
        Print ( GetNetworkClientName ( NetworkID, id ) )

id = GetNetworkNextClient ( NetworkID )
    endwhile
        
   
    if hosting = 0
        message = GetNetworkMessage ( NetworkID )

while message <> 0 
            level = GetNetworkMessageFloat ( message )

DeleteNetworkMessage ( message )

message = GetNetworkMessage ( NetworkID )
        endwhile
    endif
if level > 0 then startload = 5
endif
endif

if startload = 5			//load map and remove buttons and text
	
	for i = 1 to 10
		if GetVirtualButtonExists(i) = 1 then DeleteVirtualButton(i)
		if GetTextExists(i) = 1 then deletetext(i)		
	next i

if level = 1
				//Load a map file
		Map01 as tileMapType
		Map01 = loadMap( "Level1.json" )

//Create Tileset for loaded map from an image
		tileset01 as tilesetType
		tileset01 = createTileset( "Level1.png", Map01.tilewidth, 0 )

//draw the Map
		Map01 = createMap( Map01, tileset01, 4 )
	endif
		
	if level = 2
		//Load a map file
		Map02 as tileMapType
		Map02 = loadMap( "Level2.json" )

//Create Tileset for loaded map from an image
		tileset02 as tilesetType
		tileset02 = createTileset( "Level2.png", Map02.tilewidth, 0 )

//draw the Map
		Map02 = createMap( Map02, tileset02, 4 )
	endif
startload = 6	
endif

if startload = 6 			//active game mode. host continually sends level message for new players joining
	 if hosting = 1            
        message = CreateNetworkMessage ( )
            
        AddNetworkMessageFloat ( message, level)

SendNetworkMessage ( NetworkID, 0, message )
    endif
    
    id = GetNetworkFirstClient ( NetworkID )

while id <> 0
        Print ( GetNetworkClientName ( NetworkID, id ) )

id = GetNetworkNextClient ( NetworkID )
    endwhile
endif     
return

+ Code Snippet

startmenu:
if startload = 0		//startload 1 is the first screen you see, with Host or Join option
	AddVirtualButton(1, centerx, 300, 100)
	CreateText(1, "Host Game")
	SetTextSize(1, 75)
	SetTextPosition(1, centerx - (GetTextTotalWidth(1)/2), 175)
	AddVirtualButton(2, centerx, 500, 100)
	CreateText(2, "Join Game")
	SetTextSize(2, 75)
	SetTextPosition(2, centerx - (GetTextTotalWidth(2)/2), 375)
	startload = 1
	hosting = 1
	NetworkID = 0
	level = 0
endif

if startload = 1		//startload 1 means you have selected either to host or to join
	if GetVirtualButtonPressed(1) = 1	//you have pressed the host button, 
		deletetext(1)
		DeleteText(2)
		DeleteVirtualButton(1)
		DeleteVirtualButton(2)
		NetworkID = HostNetwork("TagNet", "Player 1", 44445)
		hosting = 1
		startload = 2
	endif
endif

if startload = 1	
	if GetVirtualButtonPressed(2) = 1		//you have pressed the join network button
		NetworkID = JoinNetwork("TagNet", "Player 2")				//joins TagNet network
		hosting = 0				//you are not a host (will be used for recieveing messages)
		startload = 4
	endif
endif
	





if startload = 2			//startload 2 is only seen by host, creates buttons for level select
	CreateText(8, "SELECT STAGE")
	SetTextSize(8, 100)
	SetTextPosition(8, centerx - (GetTextTotalWidth(8)/2), 50)
	
	AddVirtualButton(1, swidth * .25, 300, 100)
	CreateText(1, "Concrete Jungle")
	SetTextSize(1, 30)
	SetTextPosition(1, (swidth * .25) - (GetTextTotalWidth(1) / 2), 200)
	
	AddVirtualButton(2, swidth * .50, 300, 100)
	CreateText(2, "Junk Yard")
	settextsize(2, 30)
	SetTextPosition(2, (swidth * .50) - (GetTextTotalWidth(2) / 2), 200)
	AddVirtualButton(3, swidth * .75, 300, 100)
	
	AddVirtualButton(4, swidth * .25, 600, 100)
	AddVirtualButton(5, swidth * .50, 600, 100)
	AddVirtualButton(6, swidth * .75, 600, 100)

	AddVirtualButton(7, 100, sheight - 100, 100)		//this will be the back button
	startload = 3			//once buttons are loaded we go to startload 3
endif

if startload = 3			//startload 3 is data for level buttons on screen
	if GetVirtualButtonPressed(1) = 1		//button 1 selects level 1 (concrete jungle)
		level = 1			
		startload = 4		
	endif
	
	if GetVirtualButtonPressed(2) = 1		//bytton 2 selects level 2 (junk yard)
		level = 2		
		startload = 4
	endif
endif



if GetNetworkExists(NetworkID)			//guests recieve level data from host before loading map
if startload = 4 and IsNetworkActive ( NetworkID ) <> 0
	id = GetNetworkFirstClient ( NetworkID )
        

    while id <> 0
        Print ( GetNetworkClientName ( NetworkID, id ) )
        

        id = GetNetworkNextClient ( NetworkID )
    endwhile
        
   
    if hosting = 0
        message = GetNetworkMessage ( NetworkID )
            

        while message <> 0 
            level = GetNetworkMessageFloat ( message )
                

                

            DeleteNetworkMessage ( message )
                

           message = GetNetworkMessage ( NetworkID )
        endwhile
    endif
if level > 0 then startload = 5
endif
endif

	

if startload = 5			//load map and remove buttons and text
	
	for i = 1 to 10
		if GetVirtualButtonExists(i) = 1 then DeleteVirtualButton(i)
		if GetTextExists(i) = 1 then deletetext(i)		
	next i

	
	if level = 1
				//Load a map file
		Map01 as tileMapType
		Map01 = loadMap( "Level1.json" )

		//Create Tileset for loaded map from an image
		tileset01 as tilesetType
		tileset01 = createTileset( "Level1.png", Map01.tilewidth, 0 )

		//draw the Map
		Map01 = createMap( Map01, tileset01, 4 )
	endif
		
	if level = 2
		//Load a map file
		Map02 as tileMapType
		Map02 = loadMap( "Level2.json" )

		//Create Tileset for loaded map from an image
		tileset02 as tilesetType
		tileset02 = createTileset( "Level2.png", Map02.tilewidth, 0 )

		//draw the Map
		Map02 = createMap( Map02, tileset02, 4 )
	endif
startload = 6	
endif		

if startload = 6 			//active game mode. host continually sends level message for new players joining
	 if hosting = 1            
        message = CreateNetworkMessage ( )
            
        AddNetworkMessageFloat ( message, level)
            

        SendNetworkMessage ( NetworkID, 0, message )
    endif
    
    id = GetNetworkFirstClient ( NetworkID )
        

    while id <> 0
        Print ( GetNetworkClientName ( NetworkID, id ) )
        

        id = GetNetworkNextClient ( NetworkID )
    endwhile
endif     
return

Thanks again, smallg for the help.

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smallg

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Posted: 19th Jul 2018 10:16

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If both are connected you send the message once, if the other (client) is not connected then naturally it won't send to the client and the client will not receive the message when it connects after.
However the message will not be received instantly due to latency so you should loop checking for a message until it has received one using if messageid > 0 as posted earlier (I usually send a small string with any message just to identify what is in the message - I.e. "game" means it has the actual gameplay data etc and "setup" is from the map setup etc, so that if you receive a message you don't try to read incorrect data
With the correct handling of sending and receiving messages it shouldn't be necessary but definitely helps catch any stray messages that may have snuck through and as I find multiplayer can cause a lot of headaches its nice to limit as many potential problems as possible

Yes there should be 2 connections both ends

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Newcomers AppGameKit Corner / [SOLVED] cant = getnetworkmessage(message) // to work =(