https://ni.lithium.com/t5/Counter-Timer/call-library-function/m-p/72364#M613 LabVIEW can handle both strings and numerics return parameters but there isn't a return for booleans. I am not great at other programing languages, but I think many times the boolean variable is a numeric (0 or 1 for False and True). If this is not the case, then the best way to get this value into LabVIEW would be to write a wrapper DLL that would convert the boolean value to a numeric that LabVIEW could handle. <BR /> Mon, 27 Jan 2003 16:05:22 GMT BrandonS 2003-01-27T16:05:22Z https://ni.lithium.com/t5/Counter-Timer/call-library-function/m-p/72363#M612 I'm trying to use some DLL for read a counter card from heidenhain... the problem is that the functions included in the library return a Boolean variable. I don't konw how to declare the return parameter like a Boolean..... <BR /> Fri, 24 Jan 2003 09:23:11 GMT https://ni.lithium.com/t5/Counter-Timer/call-library-function/m-p/72363#M612 Jamf 2003-01-24T09:23:11Z https://ni.lithium.com/t5/Counter-Timer/call-library-function/m-p/72364#M613 LabVIEW can handle both strings and numerics return parameters but there isn't a return for booleans. I am not great at other programing languages, but I think many times the boolean variable is a numeric (0 or 1 for False and True). If this is not the case, then the best way to get this value into LabVIEW would be to write a wrapper DLL that would convert the boolean value to a numeric that LabVIEW could handle. <BR /> Mon, 27 Jan 2003 16:05:22 GMT https://ni.lithium.com/t5/Counter-Timer/call-library-function/m-p/72364#M613 BrandonS 2003-01-27T16:05:22Z