hi Ed Rauh,
Below is the function i want to call and parameter want to pass and return:
(1)
>G_ICCPresent(const WORD16 ChannelNb,Byte *Response)
>Byte Response
>G_ICCPrensent(0,&Response)

The question is how to call it in VFP by use your CLSHEAP.prg ?
What is &Response mean ? The declare is look like this?:
>Declare G_ICCPresent In V100_32.DLL string ChannelNb, String @Response
I want get the return value of Response.

(2)Below is another function :
>G_ReaderVersion(const WORD16 ChannelNb, Byte *Response)
>Byte sDataOut[20}
>G_ReadVersion(0,sDataOut)
I want to get the return value of sDataOut, how in Vfp use CLSHEAP.prg?
The declare statement is look like this ?
>Declare G_ReaderVersion In V100_32.DLL string ChannelNb, string @response

(3)Another Function :
>G_ExchangeApdu(APDU_COMM *ApduComm, APDU_RESP *ApduResp)
>typedef struct Apdu APDU_COMM;
>typedef struct Resp APDU_RESP;
>APDU_COMM ApduComm
>APDU_RESP ApduResp
>BYTE Command[COMMAND_LEN];
> WORD16 LengthIn;
>BYTE ReturnVal;
Below is value to pass:
>ApduComm.Command[0]=0x00;
>ApduComm.Command[1]=0xde;
>ApduComm.COmmand[2]=0x08;
>ApduComm.Command[3]=0x2c;
>ApduComm.LengthIn=0x00;
>ReturnVal=G-ExchangeApdu(&ApduComm,&ApduResp)
How to cal it in VFP ?

You said i have to use the Alloc() method in CLSHEAP.prg but i'm not clear about the Alloc() method. I'm sure that the DLL is Win32 API.
Thank you very much.

regard,
chang