{{tag>category:"OpenInsight 32-Bit" author:"Jim Vaughan" author:"Pat McNerthney"}}

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==== DLL parameter types (OpenInsight 32-Bit) ====
=== At 08 DEC 2004 06:08:10PM Jim Vaughan wrote: ===
 
 
<QUOTE>
I am unsure how to define a couple of paramter types for a DLL. 



From ????.H

int FUNCTYPE direct_transfer(char far *target);

char * FUNCTYPE CKTimeString(char *stringbuf, ULONG cktime);



Is the following correct?



INT PASCAL direct_transfer(LPACHAR)

LPACHAR PASCAL CKTimeString(LPACHAR, ULONG)

or is this correct?

INT PASCAL direct_transfer(LPACHAR)

LPACHAR PASCAL CKTimeString(ACHAR, ULONG)



I am unsure about the difference between the following

char *

char far *

are these both pointers or not?
</QUOTE>
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=== At 08 DEC 2004 08:25PM Pat McNerthney wrote:  ===

<QUOTE>Jim,



Both the PASCAL calling sequence and the far pointer data type are remanents of the 16-bit Windows world and are no longer used in 32-bit Windows.



If any of the "char *" parameters are suppose to be null terminated strings, I would declare those as LPASTR.  The problem is "char *" can either mean the pointer to a buffer of an array of characters, or it can mean a pointer to a null terminated string of characters.



So your declarations like this:



INT STDCALL direct_transfer(LPACHAR)

LPACHAR STDCALL CKTimeString(LPACHAR, ULONG)



are the closest.  It is hard to say which of the LPACHAR's should really be LPASTR's without a description of what the function expects.



Pat

</QUOTE>

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=== At 08 DEC 2004 08:41PM Jim Vaughan wrote:  ===

<QUOTE>Great and thanks Pat, I will set them all as LPACHAR and see if everything works. 

</QUOTE>


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