How do i fix this plugin?

Development Pipeline & Plugins Plugins
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1

In this GitHub - RyroNZ/UE4MasterServer: This is a plugin for Unreal Engine 4 that adds server registration, deregistration etc with a master server. Plugin is a function that uses zlib to compress and decompress Bytes which i would like to have aviable in Blueprint.

Here are the mentioned functions :

TArray<uint8> UMasterServerFunctions::FStringToBinaryArray(FString InString)
{
	TArray<uint8> BinaryArray;

	for (int32 i = 0; i < InString.Len(); i++)
	{
		BinaryArray.Add(InString[i]);
	}
	return BinaryArray;
}

FString UMasterServerFunctions::BinaryArrayToFString(TArray<uint8> InBinaryArray)
{
	return FString(UTF8_TO_TCHAR(InBinaryArray.GetData()));
}


FString UMasterServerFunctions::DecompressBytes(TArray<uint8> CompressedBinaryArray)
{
	TArray<uint8> UncompressedBinaryArray;
	UncompressedBinaryArray.SetNum(CompressedBinaryArray.Num() * 1032);

	//int ret;
	z_stream strm;
	strm.zalloc = Z_NULL;
	strm.zfree = Z_NULL;
	strm.opaque = Z_NULL;

	strm.avail_in = CompressedBinaryArray.Num();
	strm.next_in = (Bytef *)CompressedBinaryArray.GetData();
	strm.avail_out = UncompressedBinaryArray.Num();
	strm.next_out = (Bytef *)UncompressedBinaryArray.GetData();

	// the actual DE-compression work.
	inflateInit(&strm);
	inflate(&strm, Z_FINISH);
	inflateEnd(&strm);

	return BinaryArrayToFString(UncompressedBinaryArray);
}

TArray<uint8> UMasterServerFunctions::CompressBytes(FString UncompressedString)
{
	TArray<uint8> UncompressedBinaryArray = FStringToBinaryArray(UncompressedString);
	TArray<uint8> CompressedBinaryArray;
	CompressedBinaryArray.SetNum(UncompressedBinaryArray.Num() * 1023, true);

	//int ret;
	z_stream strm;
	strm.zalloc = Z_NULL;
	strm.zfree = Z_NULL;
	strm.opaque = Z_NULL;

	strm.avail_in = UncompressedBinaryArray.Num();
	strm.next_in = (Bytef *)UncompressedBinaryArray.GetData();
	strm.avail_out = CompressedBinaryArray.Num();
	strm.next_out = (Bytef *)CompressedBinaryArray.GetData();


	// the actual compression work.
	deflateInit(&strm, Z_BEST_COMPRESSION);
	deflate(&strm, Z_FINISH);
	deflateEnd(&strm);

	// Shrink the array to minimum size
	CompressedBinaryArray.RemoveAt(strm.total_out, CompressedBinaryArray.Num() - strm.total_out, true);
	return CompressedBinaryArray;

}

Ive got a MyPlugin template created from a while back where i have a couple functions blueprintcallable, and i thought i may be able to add theese aswell.

so i added the Zlib.h/inflate/deflate/zconf.h to my Plugin folder and copied the functions / includes

everything fine so far … i can compile but when i try to use one of the functions

http://i.imgur.com/mTiSSJP.png

All i tried so far resulted in either compilation error or the same target requirement ( compilation Error says that an illegal nonstatic memberfunction was called)

I know im doing something fundamentally wrong im unfortunatly unfamiliar with coding / c++ but still refuse to just not try in situations like this. Can someone help me in the right direction?

2

The reason this fails is because the plugin relies on an object. Much like how a member method of a class requires an instance of a class to be called unless it is static, the function above is not a BP library function so you have to create an object of it that you then use as the target.

HTH

3

I kinda knew that it was asking for a reference but since i had other working functions in my BPLibary which did not asked for a ref. i was confused by the request. It probably would have been possible to create an Object of my BPFuncitonlibary but i chose to just create a Component inside my Plugin and copy the functions over to it. That did work. Although it took me some time to come up with this solution your answer made me stop trying to get it to work without a reference. Thanks