>>Hi I need to convert some VB Call to An API Function into VFP, The VB Call IS:
>>
>>Public Type LStatus
>> DStatus As Integer
>> DCode As Integer
>> PStatus As Byte
>>End Type
>>
>>Private Declare Function GETStatus Lib "SomeDLL.dll" ( _
>> ByVal device As Integer, ByRef status As LStatus, _
>> ByRef devStatus As Byte, ByVal mode As Byte) As Byte
>>
>>My biggest problems are the Variables type BYTE, how do they convert to VFP and also the Structure LSTATUS
>>
>>My Conversion is the following:
>>
>>DECLARE INTEGER GetStatus IN SOMEDLL ;
>> INTEGER nDevice , STRING @STATUS, ;
>> INTEGER @devStatus, INTEGER mode
>>
>>It does not work properly and dont return anything in the Status Variable, The VB Call works fine.
>>

The variable passed in the invocation for status must be pre-initialized to a string value at least as long as the structure you've declared (in this case 9 bytes long, each integer is 4 consecutive bytes, and the trailing byte is a single character long. in addition, in order to get the modified value back from invoking the function, you need to pass the variables by reference in the invocation, ie:

nDevice = some numeric value
cString = SPACE(9)
nDeviceStatus = 0
nMode = some numeric value

nSomeVar = GetStatus(nDevice,@cString,@nDeviceStatus,nMode)


>>Anyone help will be greatly appriciated.
>>
>>Thanks
>
>Hi Stephane,
>
>Try using STRING to replace the BYTE type. For example, the status structure would be a character string nine characters long. Initialize the remaining references of BYTE to SPACE(1) (lcdevStatus = SPACE(1). The rest of the declaration looks ok. One thing I did note is that the declaration of the function in the DLL must match (in terms of case) that which is contained in the DLL.