C to PB help

[Doug McDonald]

Need to convert these two from C to PB

Declare's

void Upload( void *loadDat, unsigned int ULSize )

void *DownLoad( unsigned int request_size)

Call's

char request[] = “\5\0\2\0\0\16\0\0”;

Upload( request, 8 );

char *response = DownLoad( 4096 );


Thank you, Sorry I just don't know C

Doug

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[Kev Peel]

Doug, Try this:

Declare Sub Upload Lib "CDLL.DLL" Alias "Upload" (ByVal loadDat As Dword, ByVal ULSize As Dword)
 
Declare Function DownLoad Lib "CDLL.DLL" Alias "DownLoad" (ByVal request_size As Dword) As Dword
 
Function PBMain
    
  Local request As String
  request = Chr$(5,0,2,0,0,16,0,0)
  Upload(ByVal StrPtr(request), 8)
 
  Local response As Asciiz Ptr
  response = DownLoad(4096)
 
End Function

Since you are calling C, the functions a probably in a DLL, so I've used "CDLL.DLL" as a placeholder.

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[Doug McDonald]

Thank you Kev, it gives me a great starting point

Thanks again

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[Doug McDonald]

Thanks again for your help.

I keep getting "can't find DLL entry point" for both the
sub & function

I've tried with & without the ByVal's. I tried to get the
source code for the .dll but no go. They only would give me
the C code above.

Any other thoughts?

Thank You

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[Mike Stefanik]

One option would be to use a tool like pexports to dump the table of exported functions in the DLL. You can use that to determine what you should specify as the "alias" in your code.


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Mike Stefanik
www.catalyst.com
Catalyst Development Corporation

[This message has been edited by Mike Stefanik (edited February 22, 2007).]

[Michael Mattias]

>one option would be to use a tool like pexports

or, if you are a powerbasic licensee, you could just compile show exports and imports for pb/win 6x, 7x (original by torsten reinow)

[Doug McDonald]

Thanks all.

I did take your advice and used a utility to dump the table of
exported functions in the DLL. I found the following:

void Upload( void *loadDat, unsigned int ULSize )

void *DownLoad( unsigned int request_size)

are really:

Upload is
[email protected]

Download is
[email protected]


At least I can run it without getting a "DLL entry point " error

I now get GPF's so something is not being passed correctly
I'd guess

Again here is the 'C++' I have:

Declare's

void Upload( void *loadDat, unsigned int ULSize )

void *DownLoad( unsigned int request_size)

Call's

char request[] = “\5\0\2\0\0\16\0\0”;

Upload( request, 8 );

char *response = DownLoad( 4096 );

Here is my PB/WIN 8 code:

DECLARE SUB upload LIB "pigusb.DLL" ALIAS "[email protected]" (BYVAL loadDat AS DWORD, ULSize AS DWORD)
DECLARE FUNCTION downLoad LIB "pigusb.DLL" ALIAS "[email protected]"(BYVAL request_size AS DWORD) AS DWORD
DECLARE SUB getusb()

SUB getusb
LOCAL ret AS DWORD
LOCAL request AS STRING
request = CHR$(5,0,2,0,0,16,0,0)
upload (BYVAL STRPTR(request), 8)

LOCAL response AS ASCIIZ PTR
response = DownLoad(4096)
CONTROL SET TEXT hDlg, %IDC_TEXTBOX1, STR$(response ) 'see if I get the ptr
END SUB

Thank you for any help. You guy's are GREAT


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[José Roca]

Add BYVAL to the ULSize parameter:

DECLARE SUB upload LIB "pigusb.DLL" ALIAS "[email protected]" (BYVAL loadDat AS DWORD, BYVAL ULSize AS DWORD)

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[Doug McDonald]

Thanks Jose,

Tried that, no go. I'm tring to get the C / C++ dll source code.
I have a feeling their calls they sent me are incorrect.

For all I know its a 16bit dll but I doubt it. all I have to work with is what
I posted above. They did say something about Thunking

As a little background this .dll is the interface to a NETCHIP usb chip via netchip drivers


Thanks again, sorry to bother you all

Doug

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[Kev Peel]

Doug,

The "@12" (decoration) in the call (usually) means that the parameters passed are 12-bytes long. Strange. Have you tried using STDCALL? The DLL is not 16-bit or it would not even load, I believe. Could be 64-bit, though. There is not enough information provided (there are many flavours of C\C++), this code is straight C. The compilation type is usually provided in the C project file.

Also, I use http://www.dependencywalker.com/ to check/analyze DLL exports/imports.

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[Doug McDonald]

Tanks Kev,

I did use Dependency walker, thats how I got the real sub/function names
I totally agree that the @12 would seem to indicate its looking for 12 bytes.
Too bad Dependency Walker doesn't show what params are passed, if it
does I don't know how.

I tried Stdcall, Cdecl ect....nothing worked

Your correct, I don't have enough info. I do believe they use Java

Here is all I got:

"My previous E-mail contained the two method signatures:

void Upload( void *loadDat, unsigned int ULSize )



void *DownLoad( unsigned int request_size)



I believe you may be able to load the dll and call these two without thinking about any USB protocol.



To send the request bytes to the pig might look something like this in C…



char request[] = “\5\0\2\0\0\16\0\0”;

Upload( request, 8 );

Followed by

char *response = DownLoad( 4096 );

to return a pointer to the actual data.

I don’t know the details of thunking and calling a dll in VB.net, but the procedure is probably quite similar. We do all our calls through two nearly identical methods in java."

BTW I'm not using VB.Net

Thanks again


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