The name following the Function keyword is the name your program uses to access the imported function. The Auto modifier instructs the runtime to convert the string based on the method name according to common language runtime rules (or alias name if specified). The Declare statement includes the following elements. The new project is displayed.Īdd the following Declare function either to the class or module in which you want to use the DLL: Declare Auto Function MBox Lib "user32.dll" Alias "MessageBox" (
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Select Windows Application from the list of Visual Basic project templates. Open a new Windows Application project by clicking New on the File menu, and then clicking Project. For more information about the constants that Windows APIs use, examine the header files such as Windows.h included with the Platform SDK. This walkthrough provides information for those situations in which using Windows APIs is necessary.įor complete information about the Windows APIs, see the Win32 SDK documentation in the Platform SDK Windows API. NET Framework to perform tasks, instead of Windows API calls.
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Whenever possible, you should use managed code from the. Windows API calls were an important part of Visual Basic programming in the past, but are seldom necessary with Visual Basic. You can use PInvoke in Visual Basic by using either the Declare statement or applying the DllImport attribute to an empty procedure. For more information, see Consuming Unmanaged DLL Functions. Platform invoke is a service that enables managed code to call unmanaged functions implemented in DLLs. NET Framework is performed using platform invoke, or PInvoke. Because of these differences, and because Windows APIs are not COM objects, interoperability with Windows APIs and the. Windows APIs do not use managed code, do not have built-in type libraries, and use data types that are different than those used with Visual Studio. Windows APIs represent a special category of interoperability. The disadvantage is that Windows APIs can be difficult to work with and unforgiving when things go wrong. The advantage of using Windows APIs in your code is that they can save development time because they contain dozens of useful functions that are already written and waiting to be used. For example, Windows provides a function named FlashWindowEx that lets you make the title bar for an application alternate between light and dark shades. You use them to perform tasks when it is difficult to write equivalent procedures of your own. Windows APIs are dynamic-link libraries (DLLs) that are part of the Windows operating system.
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