Compiler Error 1508 - Crestron SIMPL+ Reference Manual

Crestron SIMPL+
Language Reference Guide - DOC. 5797G
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Compiler Error 1508

function argument error: I/O variable cannot be passed to
Read file functions (ReadInteger, ReadString, etc.) cannot contain Input or Output
variables for the function's resulting read buffer.
The following are examples of this error:
DIGITAL_OUTPUT digOut;
STRING_OUTPUT strOut;
FUNCTION MyFunc( SIGNED_INTEGER nHandle )
{
STRING str[100];
INTEGER x;
ReadInteger( nHandle, x );
ReadString( nHandle, str );
ReadInteger( nHandle, digOut ); // error
ReadString( nHandle, strOut );
}
read file functions: '<identifier>'
// ok
// ok
// error
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