# Problem with .api Configuration
**URL:** https://forum.legato.io/t/problem-with-api-configuration/5537
**Category:** Uncategorized
**Created:** [December 7, 2020, 8:55am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537 "2020-12-07T08:55:34Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@reinhard2](https://forum.legato.io/u/reinhard2)
#### Post date: [December 7, 2020, 8:55am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/1 "2020-12-07T08:55:34Z")
Hey, i wrote a function getConfig that reads a file “config.conf” in one App.
Now i want to call that Function in another App using a .api file. I guess somethings wrong with my API file but i am not sure what. But after specifying the api file and compiling i get following error:
/home/reinhard/myLeafWorkspace/CL\_Agents/Components/CL\_ConfigComponent/CL\_Config.c:26:6: error: conflicting types for ‘IF\_Config\_getConfig’
void IF\_Config\_getConfig(char\* customerId,char\* siteId, char\* locationId, char\* host, int\* port, int\* enableTls);
(Without the API file it compiles fine)
My API file looks like this:
FUNCTION int32 getConfig
(
string customerId[7] OUT,
string siteId[5] OUT,
string locationId[2] OUT,
string host[30] OUT,
int32 port OUT,
int32 enableTls OUT
);
Thanks in advance!
---
### Author:  [@jyijyi](https://forum.legato.io/u/jyijyi)
#### Post date: [December 7, 2020, 9:15am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/2 "2020-12-07T09:15:54Z")
you can delete one by one to know which one makes the problem:
string customerId[7] OUT,
string siteId[5] OUT,
string locationId[2] OUT,
string host[30] OUT,
int32 port OUT,
int32 enableTls OUT
---
### Author:  [@reinhard2](https://forum.legato.io/u/reinhard2)
#### Post date: [December 7, 2020, 9:28am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/3 "2020-12-07T09:28:59Z")
It seems to be all of them, when i change OUT to IN and change char\* to const char\* i stop getting that error but of course i don’t want to send the DAta in i want to get the data out.
The function is declared like:
int IF\_Config\_getConfig(char\* customerId,char\* siteId, char\* locationId, char\* host, int\* port, int\* enableTls);
---
### Author:  [@jyijyi](https://forum.legato.io/u/jyijyi)
#### Post date: [December 7, 2020, 9:38am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/4 "2020-12-07T09:38:24Z")
From your previous discussion thread, the IPC\_step4.rar already use both OUT and IN, but you say it is ok.
> [@Biderectional communication between Apps](https://forum.legato.io/t/biderectional-communication-between-apps/5532/7):
>
> It works now! Thanks for your Help!
And here says string must be IN:
> **[Syntax - Legato Docs](https://docs.legato.io/latest/apiFilesSyntax.html#apiFilesSyntax_typesStruct)**
>
> legato™ is an open source Linux-based embedded platform designed to simplify connected IoT application development
---
### Author:  [@reinhard2](https://forum.legato.io/u/reinhard2)
#### Post date: [December 7, 2020, 9:45am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/5 "2020-12-07T09:45:36Z")
Oh, that’s because I changed it up for my needs and i only needed IN.
Where does it say that? Under “Specifying a Function” a OUT string is listed as an example.
---
### Author:  [@reinhard2](https://forum.legato.io/u/reinhard2)
#### Post date: [December 7, 2020, 10:14am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/6 "2020-12-07T10:14:55Z")
I now tried passing the Data as struct and i get following error:
API:
STRUCT SWI\_Config
{
string customerId[7];
string siteId[5];
string locationId[2];
string host[30];
int32 port;
int32 enableTls;
};
FUNCTION SWI\_Config getConfig
(
);
Function:
IF\_Config\_SWI\_Config\_t IF\_Config\_getConfig();
---
### Author:  [@reinhard2](https://forum.legato.io/u/reinhard2)
#### Post date: [December 7, 2020, 10:25am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/7 "2020-12-07T10:25:52Z")
Got it to work using struct.
Still thanks!
---
### Author:  [@jyijyi](https://forum.legato.io/u/jyijyi)
#### Post date: [December 7, 2020, 10:58am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/8 "2020-12-07T10:58:35Z")
I found that you need to add one more parameter(message2Size) in the .c file in case you need to add OUT string:
```
void logger_logMessage
(
const char* message , ///< [IN]
char* message2,
size_t message2Size
)
{
LE_INFO( PREFIX_LOG_MSG "received the message \"%s\" from a client.",
message );
snprintf( message2, MESSAGE_SIZE,
"1234123412341324");
message2[MESSAGE_MAX] = '\0';
}
FUNCTION logMessage
(
string message[MSG_API_SIZE] IN,
string message2[MSG_API_SIZE] OUT
);
```
---
### Author:  [@reinhard2](https://forum.legato.io/u/reinhard2)
#### Post date: [December 7, 2020, 11:02am UTC](https://forum.legato.io/t/problem-with-api-configuration/5537/9 "2020-12-07T11:02:24Z")
Thanks that will be very useful!