>Ed Rauh,
>
>I have a DLL that's written in C language.
>The function inside the DLL is :
>>> Get_OpenPort(Channel_Param *channel)
>in C to pass the parameters and call function is :
>>> Channel_Param chan1 ;
>>> chan1.BaudRate=Baud9600 /*Baud9600 was define in .h file/
>>> chan1.Port=Com2 /*Com2 was define in .h file and included/
>>> Get_OpenPort(&chan1) /*call the function and pass parameters/
>
>I want to Use VFP to call the DLL and pass the parameters into function.
>I can register the DLL already by used Declare statement , but when i want to call the function and pass parameter i faced a problem.
>Do you know how to call and pass parameter in VFP? thanks

See the message I just responded to; without the C typedef, there's no way to know what the structure looks like, and without the constant declarations from the associated .H file, the values being passed are not known. You're probably better off using the MSComm control to handle the serial port (there are other third-party libraies to handle serial communications as well, that are known to support VFP, too.)