View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0006652||JEDI VCL||00 JVCL Components||public||2018-10-08 10:44||2019-05-01 07:21|
|Product Version||Daily / GIT|
|Target Version||Fixed in Version|
|Summary||0006652: JvHidDeviceController LoadSetupApi returns false|
I have a program for a HID device using TJvHidDeviceController and the program works on most PC's but not on some machines. It turns out, that on these machines these two functions
are not available.
That means, that LoadSetupApi in JvSetupApi.pas is returning false.
These functions are not used in JvHidControllerClass.pas.
Only these 5 functions are required:
In LoadSetupApi, more than 400 functions are dynamically linked (if case SETUPAPI_LINKONREQUEST is set) and if one fails, than the function returns FALSE.
I am wondering, if it is a good idea to use LoadSetupApi in TJvHidDeviceController. Why not write another function which is linking just the above functions?
Also, would it not be wise to have an overloaded function
function GetModuleSymbolEx(Module: TModuleHandle; SymbolName: string; var ErrorMsg: string): Pointer;
which returns in ErrorMsg the FIRST SymbolName where GetProcAddress failed?
In this case, LoadSetupApi could return, which of the more than 400 linked functions failed.
|Tags||No tags attached.|
Issued pull request for a version which inplements a LoadAPI sort of function inside JvHIDControllerClass unit:
Please check it.
I don't like duplication of code, I'd rather have JvSetupApi modified to be able to tell it which of the 400 functions are to be loaded.
But I even think that there should not be any reason to change that because the MSDN documentation says that the two "missing" functions are available since Windows 2000.
So the real question is "On what version of Windows was this a problem?"
I can agree with the not liking of duplication of code. But I wonder why those two methods mentioned are not available on some machines even if they should be available since Windows 2000, an OS no longer supported by Microsoft since 2006.
Question to the original creator of this issue here: which OS do those machines where it fails run?
I received an answer from one person using my program (which uses TJvHidDeviceController) and he said, that he is using Linux and CrossOver. I did not know this. Maybe the other person is using Linux too with CrossOver (or Wine).
At the moment, my program is working on these machines, cause I created a new unit based on the JvHidController.pas and importing just these functions:
In fact, almost like the modified JvHidControllerClass unit from above, but I do import 11 functions, not 10.
Anyway, I would like to have an idea, why "LoadSetupApi" returned false.
I just noticed, that the latest JVCL Daily packages are from 2019-04-30 08:32:24 UTC, but the latest JCL Daily packages are from 2018-04-29 06:27:35 UTC. Is this a bug and for the JCL it should be 2019 and not 2018 or is the JCL realy not updated since more than a year?
Or is my link old?