Usedll Failed

[Charise Scrivner]

MiniToolOEM program enable partners like hardware / software vendors and relative technical service providers to embed MiniTool software with their own products to add value to their products or services and expand their market.

Sometimes, when you want to open a program on your Windows computer, you only receive an unable to load DLL/failed to load DLL error. If you want to use the program successfully, you need to take some measures. This post from MiniTool Software will show you some available solutions.

The unable to load DLL/failed to load DLL error always occurs when you launch a program on your Windows computer. When you open a program, the program will call out a certain DLL file to perform the task. However, if the specified DLL file is failed to be loaded, the error in loading DLL issue will occur.

When encountering this issue, you will ask: how do I fix unable to load DLL? In the following guides, we will show you how to get rid of this unable to load DLL/failed to load DLL error using different methods.

The residual registry keys can also cause the unable to load DLL/failed to load DLL error. To rule out this cause, you can use a professional registry cleaner to clean the residual registry on your computer.

If the referenced DLL file is a legitimate DLL, you will be unable to launch the program because you are unable to load DLL/failed to load DLL. In this case, you can re-register the DLL file and then check whether the issue goes away.

You can first download and install the trial edition of this software on your computer. Then, you can use it to scan the drive you want to recover data from and check whether you can find the files you want to recover from the scan results.

This software is very easy-to-use. You can open it, select the target drive to scan, and then find your needed files. If you want to recover all of your needed files, you will need to upgrade it to a full edition. If you are a personal user, the Personal Ultimate edition can fully meet your requirements.

Now, you should know how to fix unable to load DLL or failed to load DLL and how to get back your lost data using MiniTool Power Data Recovery. Should you have any related issues, you can let us know in the comments.

I'm already tired, I can not start apache, I'm reinstalled it a few times, but it doesn't work, was a different situations, such as firewall or whatever, but now I can not run apache ordinary cause it says "The requested operation has failed", I used cmd and there I've got errors:

if I comment line 60 the error will be in the next line, there is a module files and apache can not run them, I think it's all 'caz directories wrong, but which the same, everywhere I wrote right path?

You're trying to load a Linux shared object (mod_actions.so) into a Windows version of Apache (which would use .DLL files). You need to either find a compiled Windows DLL of mod_actions or download the source and compile it yourself.

Scenario: I am writing a little C code library to be called from LabVIEW. I build my DLL and create a test VI with a Call Library Function Node. I configure it, it runs, it works.

Close the VI, make changes and rebuild the DLL. Reopen the VI. It shows a broken arrow. This reveals the error "Library not found or failed to load". Open the configuration, re-select the DLL, re-select the function within the DLL from the pulldown menu. It's there, nicely smiling, making me believe that everything is going to be okay. Close the configuration, and nothing has been fixed.

The only solution I have found that sometimes works is to delete the Call Library Function Node and re-create it from scratch. That's going to be a long, tedious development cycle! Any help? My C code, my DLL, and my VI are attached. (And by the way, it doesn't read from Excel, I'm not even dealing with that complexity until I can reliably call the DLL! To the best of my knowledge it has no external dependencies except perhaps the C runtime library itself.)

That may look like that since you commented out the code in the C file that calls the libxl functions but we haven't seen your header or project file. There could be very well definitions in there that are pulled into the source code no matter what and cause your DLL to be referenced anyhow such as a lib statement that defines the import library to link into the compiled dll or a project setting for the libxl.lib file.

What happens here is that LabVIEW asks Windows to call the ReadExcel.dll and Windows sees that it probably requires the libxl.dll (or whatever it is called). Windows only searches certain locations for DLLs and aside from the and directory as well as the directory in which the executable is located that started the current process, it also searches in the . This is a remainder of the old single threaded DOS execution model and is pretty much an anachronism that survived all the time in Windows for various backwards compatibility reasons. An "interesting" feature of Windows is that this directory gets updated for the current process whenever the user dismisses the Windows file dialog with the OK (Open, Save, Select) button the whatever directory the user was in at that moment. So you browsing in LabVIEW to the directory with your own DLL will set the current directory to that directory and suddenly Windows can find the libxl.dll that your own DLL references.

So Rolf, you saw that I commented out all the code relating to LibXL. How then did that dependency survive? Are these things "sticky" in VS? Also, I built my dll in Labview 2017, but you found a C Runtime reference to Labview 2015. How could that have happened??

So you inspired me to go and learn how to use Dependency Walker. I gave it a try. Behold. I see the libxl.dll dependency, but I also see strange error reports under Kernel32.dll that, if they were true, my system would surely be inoperable! A similar list shows for UCRTBASED.DLL. Not only that, but the icon beside kernel32.dll shows a 64 as if it were a 64-bit DLL. Does that make any sense??

I tried copying libxl.dll into \Windows\System32. It still didn't make my dll happy to load. Although if I build a dll without any dependency on libxl, it loads fine! Is there any way to get more detailed diagnostic information out of the loading process, to figure out what exactly it is choking on?

I never said anything about a LabVIEW 2015 C runtime. The vcruntime140(d).dll is part of the Visual Studio 2015 C Runtime Library. If you use Visual Studio 2017 you have set in your project to target the vc14 runtime somehow.

There are various possibilities to reference the libxl.dll somehow. It could be that you still listed the libxl.lib file in the linker settings of your project and then Visual Studio may still link it into the DLL eventhough it's not referenced at all. Or you use incremental compile and the reference from an earlier attempt still was in the compiler output directory and got picked up somehow. Or, or, or, .....

No ReadExcel.dll is referenced by the Call Library Node by path and will be loaded with that full path so LabVIEW won't have trouble to load that. But LabVIEW knows nothing about the libxl.dll dependencies and shouldn't even try to know. That would be a very nasty rabbit hole when applications try to second guess Windows dll dependency loading.

Dependency Walker is an older application which has not been updated to properly work with 32-bit/64-bit references as well as with the so called SxS (side by side) technology Microsoft invented for Window Vista to circumvent DLL hell by creating DLL chaos!

So the results it shows in terms of what 32/64 bit DLL is loaded is only partly correct. It tends to only look in the system directory for the bitness the Dependency Walker was itself compiled for and therefore gets them wrong if you analyze a DLL with a different bitness. And the modularization of the Windows kernel DLLs in Windows 7 into submodules it can't correctly handle either. Just ignore them. The principle about what DLLs are referenced is still correct.

The plot thickens. I tried copying my DLL, ReadExcel.dll, into C:\Windows\System32. Seen from a folder window, it is there just fine. Then I go to load it from this location into a LabVIEW call node. From the file picker, I cannot see it there! Nor libxl.dll. I see a set of files that is partially overlapping but in no way identical to the set of files shown in the folder window. As if I had stumbled upon a shadow copy of the System32 directory! Screenshot included below. Have you ever heard of such a thing?

On 64-bit Windows, System32 is for 64-bit DLLs, and SysWOW64 is for 32-bit DLLs. I know it sounds mixed up, but that is how it is. If a 32-bit app passes a path to System32 to a file function, Windows in its great wisdom will redirect that to SysWOW64 instead and vice versa for a 64-bit application trying to access SysWOW64.

So put your 32-bit DLL in the SysWOW64 folder and in the Call Library Node only enter the DLL name without any path. LabVIEW will request Windows to load that DLL name and Windows will find it in SysWOW64. Also since you only specified the name in the Call Library Node LabVIEW will NOT copy the DLL into the build application folder but simply expect that the ReadExcel.dll is findable by Windows on any target system. While referencing the ReadExcel.dll with full path is possible (and LabVIEW would then copy that DLL into the support folder in the build directory too) you have to make sure that libxl.dll is findable by Windows since LabVIEW knows nothing about this.

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