Dll Calling Help

[dmca]

Hi, I've been trying to use dllcall on a simple dll that is designed to convert an inputted string into a PDF417 2D barcode.

I have all the info I should be on the dll but I can't seem to get it to work for me.

According to what I've read in the DLL's reference manual, I just have to use a function called PDF417Encode. This function looks like this

void PDF417Encode(

LPCTSTR Message,

WORD Mode,

WORD ErrorCorrectionLevel,

WORD Rows,

WORD Columns,

BOOL TruncateSymbol,

BOOL HandleTilde);

$test=DllCall("PDF417Font.dll", "wstr","test","dword*","2","dword","2","dword","3","dword","3", "int", "0", "int", "0") ;

I know its just something small I must be doing incorrectly with the call. The values I've selected are recommended by the manual as default. I haven't been able to get a returned value at all My end result is to have a script that I pass a string and its simply outputted as the formatted Barcode. Any help would be appreciated, thx.

[water]

I used h2au3 from the german AutoIt forum to convert the DLL call to AutoIt. Here is the result:

Func PDF417Encode ($Message, $Mode, $ErrorCorrectionLevel, $Rows, $Columns, $TruncateSymbol, $HandleTilde)

    Local $aRes = DllCall ("PDF417Font.dll", "none", "PDF417Encode", _
                                "WSTR", $Message, _
                                "WORD", $Mode, _
                                "WORD", $ErrorCorrectionLevel, _
                                "WORD", $Rows, _
                                "WORD", $Columns, _
                                "BOOL", $TruncateSymbol, _
                                "BOOL", $HandleTilde)
    Return $aRes[0]

EndFunc

As I'm not very firm with DLL calls I can't guarantee that this will work

[dmca]

Thanks for the reply. That's great. That seems to be the format I was using anyway. All It seems to return is '0'. It seems to be processing correctly but there must be something wrong in the way I am returning the value.

I used h2au3 from the german AutoIt forum to convert the DLL call to AutoIt. Here is the result:

Func PDF417Encode ($Message, $Mode, $ErrorCorrectionLevel, $Rows, $Columns, $TruncateSymbol, $HandleTilde)

    Local $aRes = DllCall ("PDF417Font.dll", "none", "PDF417Encode", _
                                "WSTR", $Message, _
                                "WORD", $Mode, _
                                "WORD", $ErrorCorrectionLevel, _
                                "WORD", $Rows, _
                                "WORD", $Columns, _
                                "BOOL", $TruncateSymbol, _
                                "BOOL", $HandleTilde)
    Return $aRes[0]

EndFunc

As I'm not very firm with DLL calls I can't guarantee that this will work

[bogQ]

well you have "none" return tupe, change it according to documantation for that dll

if needed add :cdecl next to return valye

eg.

DllCall("SQLite.dll", "int:cdecl"

[water]

According to the manual "0" means: Everything worked fine. As BogQ noted you have to define the return value which seems to be a pointer to a pointer.