In Windows XP systems, for the wlanapi.dll file to work, you should have Microsoft Core XML Service 6.0 installed. The Windows Hot Fix KB918997 provides several files including wlanapi.dll for Windows XP systems without existing wireless connectivity configuration options. Wlanapi.dll - original dll file, download here. One click to download this file. Product name: Microsoft® Windows® Operating System.
Recommended: Possible Wlanapi.dll Error Messages. 'Wlanapi.dll cannot be found.' . 'This program can't start because Wlanapi.dll is missing from your computer.' . 'Wlanapi.dll is missing.' .
'There was a problem starting path Wlanapi.dll. The specified module could not be found.' . 'Runtime Error. Wlanapi.dll pure virtual function call.' . 'Access Violation File path Wlanapi.dll'.
'Unable to launch the software located at path: path Wlanapi.dll'. 'This application requires the file Wlanapi.dll, which was not found on this system.' Recommended: If you're not good at computers, it's recommended that you use this Automatic Error Fix Tool to fix this kind of problem. Possible Causes of Wlanapi.dll Error You may get Wlanapi.dll error message when you are trying to run or install some applications. This kind of error can happen when Windows or software starts or shuts down, or maybe when you are using the computer or software. When and how this Wlanapi.dll error happens is very important and helpful to figure out the cause and work out the effective solution. Wlanapi.dll error may be caused by the following situations:.
Wlanapi.dll file may be mistakenly deleted by someone, computer antivirus or system cleaning tools. Wlanapi.dll file is corrupted or damaged by virus infections. Some applications were installed or uninstalled improperly. The configuration entries of Wlanapi.dll file is still active in the systemregistry. There may be something wrong with your computer hardware.
How to Fix Wlanapi.dll Error Manually? Warm Tips: It's not recommended to download Wlanapi.dll file from those so-called DLL download websites, because those DLL files provided on those DLL download websites may be out-dated, incompatible with your system or software, or even infected with malicious malware. So if you need a copy of Wlanapi.dll file, it's best for you to get it from its original and legitimate source. If you are not able to use your computer normally due to kind of Wlanapi.dll error message, you can start your computer into Safe Mode to fix your problem with any of the following methods. Video of How to start computer into Safe Mode For Windows 7/Vista For Windows 8 Fix methods: 1.Restart your machine.
You can restart your machine to fix Wlanapi.dll error, as Wlanapi.dll error might be a fluke and a simple restart may fix it. 2.Use Registry Cleaner to repair Wlanapi.dll error. Wlanapi.dll error may be caused by related problems in the system registry. A registry cleaner could be very helpful to help you remove those invalid registry entries or fix other registry issues related to Wlanapi.dll file and it could save your time and risk to find and delete them by yourself.
Repairing the registry can fix most of this kind of computer errors, click and download this Automatic Fix Tool. Note: The registry is the most important part of the Windows Operating System and stores all information and configuration about how the Windows runs. So if you do not have sufficient computer know-how, it's not recommended that you edit the registry by yourself. 3.Restore Wlanapi.dll file from the Recycle Bin. If your Wlanapi.dll file is missing or not found and you think it may be mistakenly deleted by yourself, the easiest way to get it back is to restore it from the Recycle Bin. What if you have emptied the Recycle Bin?
You may try to recover Wlanapi.dll file with a recovery program. But the condition is that Wlanapi.dll file was still working properly before you deleted it. 4.Execute the sfc /scannow command The sfc /scannow feature will check all of essential Windows files and replace it if the System File Checker (sfc) finds it's corrupted, damaged or missing. To run sfc /scannow command, please follow the steps: For Windows 8 Users 1).Press 'Windows+X' to bring up the menu below and then select 'Command Prompt (Admin)' option. 2).Click 'Yes' to run the command.
3).Type in sfc /scannow(There's a space between sfc and /scannow) into the dialog and hit Enter key. 4).Wait until the System File Checker finishes the check.
For Windows 7 and Vista Users: 1).Press 'Windows+R', type in cmd and then right click 'Run as administrator' 2).Type in sfc /scannow (There's a space between sfc and /scannow) into the dialog and hit Enter key. 3).Wait until the System File Checker finishes the check. 5.Install or Roll back to the old versions of device drivers If Wlanapi.dll error happens after you update your software or hardware devices, you could find and re-install the old version of the driver. You can also use the 'Roll Back' feature in Windows system.
6.Scan your whole computer for virus infections. When a virus infection infects Wlanapi.dll file, it will add some malicious code and modify your Wlanapi.dll file. So you could see Wlanapi.dll error message popping up when running a software or turning on your machine, as this infected Wlanapi.dll file cannot work properly. It's also possible that this Wlanapi.dll error message is created by some virus that deliberately generates such fake error messages to scare you and mislead you buying its useless products.Click and download to check your system.
7.Repair Installation of your Windows System. A Windows repair installation, also known as a Startup Repair is very useful when you want to repair or reinstall your Windows system files while you don't want to lose all of your personal data and software intact. If you have tried the above fix advice but still with no luck, you can perform a Refresh, Startup Repair or Repair Installation to restore all Windows DLL files. 8.Install the latest Windows updates. Microsoft often releases new service packs and system patches to replace or update some DLL files of Windows system.
So you could try to install the latest Windows updates to fix Wlanapi.dll error if Wlanapi.dll file is included in one of those updates. 9.Re-install your Windows system.
A new installation will format your hard drive and install a fresh copy of Windows system. But you should know that all of your personal data, programs and system patches will be completely removed if you re-install your Windows system. It's advisable for you to try the above advice before you re-install your computer. It's recommended to use Automatic Error Fix Tool to fix your Wlanapi.dll error. Testimonials. Great!
My computer runs much faster now. I never thought there were so many problems with my computer until I read your guide and use your tool. My computer seems to start up very fast now and the error message does not pop up any more.Zoe C, US. I always got an error message telling me that a DLL file cannot be found. My mind got blank, as I didn't know what a DLL file is, let alone fix it.I did a search and found your website. I felt helpless and decided to give a try of your advice.
It fixed the error! You're really my life saver!
-Christina S, AU. I got an error for nearly one month and tried many methods to fix it with no luck! Before reading your guide, I didn't know there are so many possible causes to this kind of error. You guys are really helpful! -Kane R, CA.
How to Fix WLANAPI.DLL Module Name: WLANAPI.DLL Company: Microsoft Corporation Notice: Windows Error WLANAPI.DLL happens when your operating system becomes misconfigured, important system files go missing or get damaged. This is a common problem with computers that don’t get maintained regularly.
Eventually the system becomes overloaded with problems and begins to crash and display errors. Recommended Solution: We recommend you download our repair tool. It is designed to diagnose problems on your computer and fix them in just a few minutes with only a few mouse clicks. Download Microsoft Windows Error Repair Tool File Size: 6 MB Compatible: Windows XP/Vista/7/8 (32/64-BIT) Instructions to diagnose and fix Windows Errors problems: Please follow the following 3 steps to diagnose and fix your problem: STEP 1: STEP 2: Click Scan to Find The Issue. STEP 3: Click Fix Errors to Repair Error. Note: With all the new additional features now included in the repair tool, you will be able to optimize your system to run even faster and stable.
It’s not unusual to see an increase of 95%+ in performance. Operating System Compatibility:Windows XP/Vista/7/8 (32/64BIT) Download Size: 6 MB Version 2014 Expert Support: Yes For the Microsoft Windows operating systems that are listed in the “Applies to” section, much of the functionality of the operating system is provided by dynamic link libraries (DLL). Additionally, when you run a program on one of these Windows operating systems, much of the functionality of the program may be provided by DLLs.
For example, some programs may contain many different modules, and each module of the program is contained and distributed in DLLs. The use of DLLs helps promote modularization of code, code reuse, efficient memory usage, and reduced disk space. Therefore, the operating system and the programs load faster, run faster, and take less disk space on the computer.
When a program uses a DLL, an issue that is called dependency may cause the program not to run. When a program uses a DLL, a dependency is created. If another program overwrites and breaks this dependency, the original program may not successfully run. With the introduction of the Microsoft.NET Framework, most dependency problems have been eliminated by using assemblies. What is a DLL?
A DLL is a library that contains code and data that can be used by more than one program at the same time. For example, in Windows operating systems, the Comdlg32 DLL performs common dialog box related functions. Therefore, each program can use the functionality that is contained in this DLL to implement an Open dialog box. This helps promote code reuse and efficient memory usage. By using a DLL, a program can be modularized into separate components.
For example, an accounting program may be sold by module. Each module can be loaded into the main program at run time if that module is installed. Because the modules are separate, the load time of the program is faster, and a module is only loaded when that functionality is requested. Additionally, updates are easier to apply to each module without affecting other parts of the program. For example, you may have a payroll program, and the tax rates change each year.
When these changes are isolated to a DLL, you can apply an update without needing to build or install the whole program again. The following list describes some of the files that are implemented as DLLs in Windows operating systems: ActiveX Controls (.ocx) files An example of an ActiveX control is a calendar control that lets you select a date from a calendar. Control Panel (.cpl) files An example of a.cpl file is an item that is located in Control Panel. Each item is a specialized DLL. Device driver (.drv) files An example of a device driver is a printer driver that controls the printing to a printer. DLL advantages The following list describes some of the advantages that are provided when a program uses a DLL: Uses fewer resources When multiple programs use the same library of functions, a DLL can reduce the duplication of code that is loaded on the disk and in physical memory.
This can greatly influence the performance of not just the program that is running in the foreground, but also other programs that are running on the Windows operating system. Promotes modular architecture A DLL helps promote developing modular programs. This helps you develop large programs that require multiple language versions or a program that requires modular architecture. An example of a modular program is an accounting program that has many modules that can be dynamically loaded at run time. Eases deployment and installation When a function within a DLL needs an update or a fix, the deployment and installation of the DLL does not require the program to be relinked with the DLL. Additionally, if multiple programs use the same DLL, the multiple programs will all benefit from the update or the fix. This issue may more frequently occur when you use a third-party DLL that is regularly updated or fixed.
DLL dependencies When a program or a DLL uses a DLL function in another DLL, a dependency is created. Therefore, the program is no longer self-contained, and the program may experience problems if the dependency is broken. For example, the program may not run if one of the following actions occurs: A dependent DLL is upgraded to a new version. A dependent DLL is fixed. A dependent DLL is overwritten with an earlier version.
A dependent DLL is removed from the computer. These actions are generally known as DLL conflicts. If backward compatibility is not enforced, the program may not successfully run. The following list describes the changes that have been introduced in Microsoft Windows 2000 and in later Windows operating systems to help minimize dependency issues: Windows File Protection In Windows File Protection, the operating system prevents system DLLs from being updated or deleted by an unauthorized agent. Therefore, when a program installation tries to remove or update a DLL that is defined as a system DLL, Windows File Protection will look for a valid digital signature. Private DLLs Private DLLs let you isolate a program from changes that are made to shared DLLs. Private DLLs use version-specific information or an empty.local file to enforce the version of the DLL that is used by the program.
To use private DLLs, locate your DLLs in the program root folder. Then, for new programs, add version-specific information to the DLL. For old programs, use an empty.local file. Each method tells the operating system to use the private DLLs that are located in the program root folder. DLL dependencies When a program or a DLL uses a DLL function in another DLL, a dependency is created. Therefore, the program is no longer self-contained, and the program may experience problems if the dependency is broken. For example, the program may not run if one of the following actions occurs: A dependent DLL is upgraded to a new version.
A dependent DLL is fixed. A dependent DLL is overwritten with an earlier version. A dependent DLL is removed from the computer. These actions are generally known as DLL conflicts. If backward compatibility is not enforced, the program may not successfully run. The following list describes the changes that have been introduced in Microsoft Windows 2000 and in later Windows operating systems to help minimize dependency issues: Windows File Protection In Windows File Protection, the operating system prevents system DLLs from being updated or deleted by an unauthorized agent.
Therefore, when a program installation tries to remove or update a DLL that is defined as a system DLL, Windows File Protection will look for a valid digital signature. Private DLLs Private DLLs let you isolate a program from changes that are made to shared DLLs. Private DLLs use version-specific information or an empty.local file to enforce the version of the DLL that is used by the program. To use private DLLs, locate your DLLs in the program root folder. Then, for new programs, add version-specific information to the DLL.
For old programs, use an empty.local file. Each method tells the operating system to use the private DLLs that are located in the program root folder. DLL development This section describes the issues and the requirements that you should consider when you develop your own DLLs. Types of DLLs When you load a DLL in an application, two methods of linking let you call the exported DLL functions.
The two methods of linking are load-time dynamic linking and run-time dynamic linking. Load-time dynamic linking In load-time dynamic linking, an application makes explicit calls to exported DLL functions like local functions. To use load-time dynamic linking, provide a header (.h) file and an import library (.lib) file when you compile and link the application. When you do this, the linker will provide the system with the information that is required to load the DLL and resolve the exported DLL function locations at load time. Run-time dynamic linking In run-time dynamic linking, an application calls either the LoadLibrary function or the LoadLibraryEx function to load the DLL at run time. After the DLL is successfully loaded, you use the GetProcAddress function to obtain the address of the exported DLL function that you want to call. When you use run-time dynamic linking, you do not need an import library file.
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The following list describes the application criteria for when to use load-time dynamic linking and when to use run-time dynamic linking: Startup performance If the initial startup performance of the application is important, you should use run-time dynamic linking. Ease of use In load-time dynamic linking, the exported DLL functions are like local functions. This makes it easy for you to call these functions. Application logic In run-time dynamic linking, an application can branch to load different modules as required. This is important when you develop multiple-language versions. The DLL entry point When you create a DLL, you can optionally specify an entry point function.
The entry point function is called when processes or threads attach themselves to the DLL or detached themselves from the DLL. You can use the entry point function to initialize data structures or to destroy data structures as required by the DLL. Additionally, if the application is multithreaded, you can use thread local storage (TLS) to allocate memory that is private to each thread in the entry point function. The following code is an example of the DLL entry point function. BOOL APIENTRY DllMain( HANDLE hModule, // Handle to DLL module DWORD ulreasonforcall, // Reason for calling function LPVOID lpReserved ) // Reserved switch ( ulreasonforcall ) case DLLPROCESSATTACHED: // A process is loading the DLL. Break; case DLLTHREADATTACHED: // A process is creating a new thread. Break; case DLLTHREADDETACH: // A thread exits normally.
Break; case DLLPROCESSDETACH: // A process unloads the DLL. Break; return TRUE; When the entry point function returns a FALSE value, the application will not start if you are using load-time dynamic linking. If you are using run-time dynamic linking, only the individual DLL will not load. The entry point function should only perform simple initialization tasks and should not call any other DLL loading or termination functions. For example, in the entry point function, you should not directly or indirectly call the LoadLibrary function or the LoadLibraryEx function. Additionally, you should not call the FreeLibrary function when the process is terminating. Note In multithreaded applications, make sure that access to the DLL global data is synchronized (thread safe) to avoid possible data corruption.
To do this, use TLS to provide unique data for each thread. Exporting DLL functions How to Fix WLANAPI.DLL To export DLL functions, you can either add a function keyword to the exported DLL functions or create a module definition (.def) file that lists the exported DLL functions.
To use a function keyword, you must declare each function that you want to export with the following keyword: declspec(dllexport) To use exported DLL functions in the application, you must declare each function that you want to import with the following keyword: declspec(dllimport) Typically, you would use one header file that has a define statement and an ifdef statement to separate the export statement and the import statement. You can also use a module definition file to declare exported DLL functions. When you use a module definition file, you do not have to add the function keyword to the exported DLL functions. In the module definition file, you declare the LIBRARY statement and the EXPORTS statement for the DLL. The following code is an example of a definition file.
// SampleDLL.def // LIBRARY “sampleDLL” EXPORTS HelloWorld Sample DLL and application In Microsoft Visual C 6.0, you can create a DLL by selecting either the Win32 Dynamic-Link Library project type or the MFC AppWizard (dll) project type. The following code is an example of a DLL that was created in Visual C by using the Win32 Dynamic-Link Library project type.
// SampleDLL.cpp // #include “stdafx.h” #define EXPORTINGDLL #include “sampleDLL.h” BOOL APIENTRY DllMain( HANDLE hModule, DWORD ulreasonforcall, LPVOID lpReserved ) return TRUE; void HelloWorld MessageBox( NULL, TEXT(“Hello World”), TEXT(“In a DLL”), MBOK); // File: SampleDLL.h // #ifndef INDLLH #define INDLLH #ifdef EXPORTINGDLL extern declspec(dllexport) void HelloWorld; #else extern declspec(dllimport) void HelloWorld; #endif #endif The following code is an example of a Win32 Application project that calls the exported DLL function in the SampleDLL DLL. // SampleApp.cpp // #include “stdafx.h” #include “sampleDLL.h” int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) HelloWorld; return 0; Note In load-time dynamic linking, you must link the SampleDLL.lib import library that is created when you build the SampleDLL project. In run-time dynamic linking, you use code that is similar to the following code to call the SampleDLL.dll exported DLL function. Typedef VOID (.DLLPROC) (LPTSTR); HINSTANCE hinstDLL; DLLPROC HelloWorld; BOOL fFreeDLL; hinstDLL = LoadLibrary(“sampleDLL.dll”); if (hinstDLL!= NULL) HelloWorld = (DLLPROC) GetProcAddress(hinstDLL, “HelloWorld”); if (HelloWorld!= NULL) (HelloWorld); fFreeDLL = FreeLibrary(hinstDLL); When you compile and link the SampleDLL application, the Windows operating system searches for the SampleDLL DLL in the following locations in this order: The application folder The current folder The Windows system folder Note The GetSystemDirectory function returns the path of the Windows system folder. The Windows folder Note The GetWindowsDirectory function returns the path of the Windows folder. The.NET Framework assembly With the introduction of Microsoft.NET and the.NET Framework, most of the problems that are associated with DLLs have been eliminated by using assemblies.
An assembly is a logical unit of functionality that runs under the control of the.NET common language runtime (CLR). An assembly physically exists as a.dll file or as an.exe file. However, internally an assembly is very different from a Microsoft Win32 DLL.
An assembly file contains an assembly manifest, type metadata, Microsoft intermediate language (MSIL) code, and other resources. The assembly manifest contains the assembly metadata that provides all the information that is required for an assembly to be self-describing. The following information is included in the assembly manifest: Assembly name Version information Culture information Strong name information The assembly list of files Type reference information Referenced and dependent assembly information The MSIL code that is contained in the assembly cannot be directly executed.
Instead, MSIL code execution is managed through the CLR. By default, when you create an assembly, the assembly is private to the application. To create a shared assembly requires that you assign a strong name to the assembly and then publish the assembly in the global assembly cache. The following list describes some of the features of assemblies compared to the features of Win32 DLLs: Self-describing When you create an assembly, all the information that is required for the CLR to run the assembly is contained in the assembly manifest. The assembly manifest contains a list of the dependent assemblies. Therefore, the CLR can maintain a consistent set of assemblies that are used in the application. In Win32 DLLs, you cannot maintain consistency between a set of DLLs that are used in an application when you use shared DLLs.
Versioning In an assembly manifest, version information is recorded and enforced by the CLR. Additionally, version policies let you enforce version-specific usage. In Win32 DLLs, versioning cannot be enforced by the operating system. Instead, you must make sure that DLLs are backward compatible.
Side-by-side deployment Assemblies support side-by-side deployment. One application can use one version of an assembly, and another application can use a different version of an assembly. Starting in Windows 2000, side-by-side deployment is supported by locating DLLs in the application folder. Additionally, Windows File Protection prevents system DLLs from being overwritten or replaced by an unauthorized agent. Self-containment and isolation An application that is developed by using an assembly can be self-contained and isolated from other applications that are running on the computer. This feature helps you create zero-impact installations. Execution An assembly is run under the security permissions that are supplied in the assembly manifest and that are controlled by the CLR.
Language independent An assembly can be developed by using any one of the supported.NET languages. For example, you can develop an assembly in Microsoft Visual C#, and then use the assembly in a Microsoft Visual Basic.NET project.