callExtension

1.60

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Description

Description:

Calls custom .dll also known as Extension.

Since Arma 3 v1.67 it is possible to pass array of arguments to extension.
Possible error codes:

• 101: SYNTAX_ERROR_WRONG_PARAMS_SIZE
• 102: SYNTAX_ERROR_WRONG_PARAMS_TYPE
• 201: PARAMS_ERROR_TOO_MANY_ARGS
• 301: EXECUTION_WARNING_TAKES_TOO_LONG

Each error will have entry in .rpt file with more details.

Groups:

Uncategorised

Syntax

Syntax:

extension callExtension function

Parameters:

extension: String - extension name

function: String - data send to the extension

Return Value:

String - data sent back from extension

Alternative Syntax

Syntax:

extension callExtension [command, arguments]         (Since Arma 3 v1.67)

Parameters:

extension: String - extension name

[command, arguments]: Array - callExtension params

command: String - extension command

arguments: Array - command arguments. Could be array of anything but each element will be converted to String automatically.

Return Value:

Array - in format [result, returnCode, errorCode], where:

• result: String - data sent back from extension. It is up to extension maker what it is.
• returnCode: Number - integer return from extension method. It is up to extension maker to define it.
• errorCode: Number - error code in case of command error (see description). 0 means no errors.

Examples

Example 1:

_return = "myExtension" callExtension "stringToBeParsed";

Example 2:

_result = "text_extension" callExtension ["fnc1", getUnitLoadout player]; "test_extension" source code:

#include <string>
#include <vector>
#include <iterator>
#include <sstream>

extern "C"
{
	//--- STRING callExtension STRING
	__declspec (dllexport) void __stdcall RVExtension(char *output, int outputSize, const char *function);
	//--- STRING callExtension ARRAY
	__declspec (dllexport) int __stdcall RVExtensionArgs(char *output, int outputSize, const char *function, const char **args, int argsCnt);
}

//--- name callExtension function
void __stdcall RVExtension(char *output, int outputSize, const char *function)
{
	std::string str = function;
	strncpy_s(output, outputSize, ("Input Was: " + str).c_str(), _TRUNCATE);
}

//--- name callExtension [function, args]
int __stdcall RVExtensionArgs(char *output, int outputSize, const char *function, const char **args, int argsCnt)
{
	if (strcmp(function, "fnc1") == 0)
	{
		//--- Manually assemble output array
		int i = 0;
		std::string str = "[";

		//--- Each argument can be accessed via args[n]
		if (argsCnt > 0)
			str += args[i++];

		while (i < argsCnt)
		{
			str += ",";
			str += args[i++];
		}

		str += "]";

		//--- Extension result
		strncpy_s(output, outputSize, str.c_str(), _TRUNCATE);

		//--- Extension return code
		return 100;
	}

	else if (strcmp(function, "fnc2") == 0)
	{
		//--- Parse args into vector
		std::vector<std::string> vec(args, std::next(args, argsCnt));

		std::ostringstream oss;
		if (!vec.empty())
		{
			//--- Assemble output array
			std::copy(vec.begin(), vec.end() - 1, std::ostream_iterator<std::string>(oss, ","));
			oss << vec.back();
		}

		//--- Extension result
		strncpy_s(output, outputSize, ("[" + oss.str() + "]").c_str(), _TRUNCATE);

		//--- Extension return code
		return 200;
	}

	else
	{
		strncpy_s(output, outputSize, "Avaliable Functions: fnc1, fnc2", outputSize - 1);
		return -1;
	}
}

Additional Information

See also:

callcompileparseSimpleArrayExtensions

Notes

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