mLipok

DllCall <> COM Object - Question about differences in use

4 posts in this topic

#1 ·  Posted (edited)

I have few questions.
I apologize if my question are stupid . I'll ask them as a layman / novice in DllCall.

 

Question 1:

Is there a way to Catch up error invoked by DllCall in the same or similar way like in COM object , or only by checking @error ?

 

$hDll = DllOpen("user32.dll") DllCall($hDll, "bool", "zzz")

; Then this (COM interface):

$oShell = ObjCreate("Shell.Application")
$oShell.zzz()

 

Question 2:

What are the differences in the use of some library (for example Debenu Quick PDF Library), available in both DLL and OCX versions?

As you probably know the version of the OCX, I created the UDF, and here I wonder if it's worth, in the future in similar cases use the version of the DLL or OCX more?

As you probably know I created the UDF for Debenu using ActiveX, and here I wonder if it's worth, in the future in similar cases use the version of the DLL or OCX ?

 

Please share your experience.

Best regards,
mLipok

 

Edited by mLipok
topic title

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Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

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Question 1:
When accessing common dlls, these two functions might respond with some details on the error:
_WinAPI_GetLastError()
_WinAPI_GetLastErrorMessage()

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Thanks @KaFu


Signature beginning:   Wondering who uses AutoIT and what it can be used for ?
* GHAPI UDF - modest begining - comunication with GitHub REST API *
ADO.au3 UDF     POP3.au3 UDF     XML.au3 UDF    How to use IE.au3  UDF with  AutoIt v3.3.14.x  for other useful stuff click the following button

Spoiler

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind. 

My contribution (my own projects): * Debenu Quick PDF Library - UDF * Debenu PDF Viewer SDK - UDF * Acrobat Reader - ActiveX Viewer * UDF for PDFCreator v1.x.x * XZip - UDF * AppCompatFlags UDF * CrowdinAPI UDF * _WinMergeCompare2Files() * _JavaExceptionAdd() * _IsBeta() * Writing DPI Awareness App - workaround * _AutoIt_RequiredVersion() * Chilkatsoft.au3 UDF * TeamViewer.au3 UDF * JavaManagement UDF * VIES over SOAP * WinSCP UDF * GHAPI UDF - modest begining - comunication with GitHub REST API *

My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 - BETA * ADO.au3 UDF SMTP Mailer UDF *

Useful links: * Forum Rules * Forum etiquette *  Forum Information and FAQs * How to post code on the forum * AutoIt Online Documentation * AutoIt Online Beta Documentation * SciTE4AutoIt3 getting started * Convert text blocks to AutoIt code * Games made in Autoit * Programming related sites * Polish AutoIt Tutorial * DllCall Code Generator * 

Wiki: Expand your knowledge - AutoIt Wiki * Collection of User Defined Functions * How to use HelpFile * Best coding practices * 

IE Related:  * How to use IE.au3  UDF with  AutoIt v3.3.14.x * Why isn't Autoit able to click a Javascript Dialog? * Clicking javascript button with no ID * IE document >> save as MHT file * IETab Switcher (by LarsJ ) * HTML Entities * _IEquerySelectorAll() (by uncommon) * 

I encourage you to read: * Global Vars * Best Coding Practices * Please explain code used in Help file for several File functions * OOP-like approach in AutoIt * UDF-Spec Questions *  EXAMPLE: How To Catch ConsoleWrite() output to a file or to CMD *

"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

Signature last update: 2017-06-04

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#4 ·  Posted (edited)

GetLastError for all that api that use setlasterror internally. (GetLastErrorMessage expands on [GetLastError])
 some api says use GetLastError to get an exteded error infromation ( also you can handle the error just with the return Ret[0] (dllcall way).

 

Saludos

Edited by Danyfirex

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