The following code defines the library functions provided by Pinvoke.dll. System.String or įor corresponding types in Visual Basic, C#, and C++, see the Introduction to the. Unmanaged type in Windows APIsĪpplied to a function that does not return a value.ģ2 bits on 32-bit Windows operating systems, 64 bits on 64-bit Windows operating systems. In some cases, you can substitute a type of the same size for the type listed in the table. NET Framework built-in value type or class that you use in managed code. The third column lists the corresponding. Many unmanaged libraries contain functions that pass these data types as parameters and return values. The following table lists data types used in the Windows APIs and C-style functions. The samples also demonstrate when to use the MarshalAsAttribute attribute and the Marshal class to explicitly marshal data.
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This section provides samples that demonstrate how to create managed function prototypes for passing arguments to and receiving return values from functions exported by unmanaged libraries. For instructions about how to apply the DllImportAttribute, see Consuming Unmanaged DLL Functions. You can use the documentation supplied with an unmanaged function to construct an equivalent managed prototype by applying the attribute with its optional fields and substituting managed data types for unmanaged types. Substitute managed data types for unmanaged data types. To create a prototype that enables platform invoke to marshal data correctly, you must do the following:Īpply the DllImportAttribute attribute to the static function or method in managed code. NET Framework application requires a function prototype in managed code that represents the unmanaged function. To call functions exported from an unmanaged library, a.