platform invoke

PtrToStructure is often necessary in COM interop and platform invoke when structure parameters are represented as an System. IntPtr value.

Or to call native methods with platform invoke.

With the next version of the BCL, . NET developers will be able to use memory-mapped files directly instead of via platform invoke calls.

To get the available memory for a device, use platform invoke to call the native GlobalMemoryStatus and GetSystemMemoryDivision functions.

This element enables you to trade faster interop marshaling for run-time resilience against incorrect platform invoke declarations.

Do as much work as you can in one platform invoke call rather than using multiple calls.

Some of the many DLL functions called with platform invoke require a callback function in managed code to run properly.

Platform invoke is a service that enables managed code to call unmanaged functions implemented in DLLs.

On a method outside of platform invoke has no effect.

Platform invoke, which enables managed code to call functions exported from an unmanaged library.

Guarantees that the managed object is not garbage collected until the platform invoke call completes.

Discusses differences in the. NET Compact Framework for using platform invoke to call a native component such as a DLL file.

Platform invoke enables you to control a significant portion of the operating system by calling functions in the Win32 API and other DLLs.

The same rules used to marshal values and references to platform invoke calls are used when marshaling through COM interfaces .

Can be used as an argument to a native method reached through platform invoke.

A managed object that should not be finalized until the platform invoke call returns.

Platform invoke converts the delegate to a familiar callback format automatically.

Platform invoke (PInvoke) methods must not be declared abstract or virtual.

Use this name to search your code for platform invoke or COM signatures that pass that delegate out to unmanaged code.

Platform invoke handles the underlying exported function automatically.

Some parameters and return values have different default marshaling behavior when used with COM interop or platform invoke.

Managed debugging assistant is activated for each unique platform invoke signature used during execution.

The source code for the following code examples is provided by the. NET Framework Platform Invoke Technology Sample.

When designing a managed class for platform invoke, consider the relationships between classes and DLL functions.

Wraps a handle for platform invoke operations that ensures finalization without interruption.

The following table lists the complete set of attribute fields that pertain to platform invoke.

Platform invoke operates according to the default values set on various fields that exist as metadata in an assembly.

Even though platform invoke calls can flow only from managed to unmanaged code, data can flow in both directions as In or Out parameters.

In some circumstances, finalizable objects could be reclaimed by garbage collection while executing a method within a platform invoke call.

Provides a wide variety of members that support COM interop and platform invoke services.

Platform invoke copies string arguments, converting from the. NET Framework format (Unicode) to the platform unmanaged format.

It creates a window handle in native code and performs the required platform invoke calls to native Windows functions.

The count of platform invoke calls from managed code to native code, excluding internal CLR platform invoke calls.

Verifying that all the managed types are valid parameters of platform invoke functions.

Verifying that the platform invoke metadata is correctly formatted.

Describes how to call unmanaged DLL functions using platform invoke.

Platform invoke handles such parameters differently.

This action releases the resource and invalidates the handle, causing the platform invoke call to fail.

The MDA message gives the name of the platform invoke method call that is causing the stack imbalance.

The following table shows interop logging of a platform invoke.

The runtime sets the MethodAttributes. PInvokeImpl attribute for a platform invoke method.

The managed signature of the platform invoke call might not match the unmanaged signature of the method being called.

For platform invoke, a delegate is marshaled as an unmanaged function pointer by default.

As a result, transitions are very fast, but an incorrect platform invoke declaration can cause a program failure.

A message indicating the platform invoke signature used during execution.

Platform invoke declarations for the native functions in Windows CE.

Platform invoke declarations for the native methods.

Furthermore, you can adjust the way that platform invoke creates the function and marshals data to and from the function.

Are involved, a platform invoke method call flows from managed to unmanaged code, and never the other way.

The handle could also be reclaimed while your method is blocked during a platform invoke call, such as while reading a file.

In the. NET Compact Framework version 1. 0, the runtime does not restrict platform invoke access to native code.

To a platform invoke method or function.

As with desktop applications, you can access native code by using platform invoke.

Browse and select a file with a. Wav extension, and then click Open to play the wave file using platform invoke.

Forces all platform invoke calls to take the nonoptimized path in the CLR.

You can likewise enable or disable best-fit mapping for platform invoke calls by using the.

Wraps a managed object holding a handle to a resource that is passed to unmanaged code using platform invoke.

In addition to the Win32 API, there are numerous other APIs and DLLs available to you through platform invoke.

In addition, you can sign and verify XML using X. 509 certificates without using platform invoke.

Via platform invoke because they require the operating system thread that enters a lock also exit the lock.

Incorrect platform invoke or COM declarations that use Int32 for handles instead of IntPtr.

This example illustrates how to use platform invoke services to play a wave sound file on the Windows platform.

Failures to find a native DLL or a function for a platform invoke call.

Shows how to platform invoke native code to reset the device.

Shows how to platform invoke native code to get the device memory.

You can call unmanaged methods such as these with platform invoke.

Shows how to platform invoke native code to play sounds.

To get or set the system time of the device, use platform invoke to call the native

Visual Basic uses the. NET Framework platform invoke (PInvoke) mechanism to resolve and access external procedures.

Note that using platform invoke to call the unmanaged

Returns the error code returned by the last unmanaged function called using platform invoke that has the

However, if you define the method as a platform invoke prototype, replace each

for a description of platform invoke services , see

To keep an object alive for the duration of a platform invoke call is preferred, you can also use the

A sample message of a platform invoke call on method

To execute setup tasks on all platform invoke methods in a type, use

For a description of platform invoke, see

Strings Used in Platform Invoke

Incorrect platform invoke or COM declarations that use

Value Types Used in Platform Invoke

The equivalent platform invoke definition for GetSystemTime is as follows

When platform invoke calls an unmanaged function, it performs the following sequence of actions

Using platform invoke to access legacy or unmanaged code from within managed code

Platform invoke and COM interop call flow

You can pass structures using the following platform invoke definition

Uses platform invoke of native code

A platform invoke call to an unmanaged DLL function

How-To topics demonstrate using platform invoke

To create a prototype that enables platform invoke to marshal data correctly, you must do the following: Apply the

How to: Play a Wave File Using Platform Invoke (Devices)