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SafeArrayLock function (oleauto.h)

  • Article

Increments the lock count of an array, and places a pointer to the array data in pvData of the array descriptor.

Syntax

HRESULT SafeArrayLock(
  [in] SAFEARRAY *psa
);

Parameters

[in] psa

An array descriptor created by SafeArrayCreate.

Return value

This function can return one of these values.

Return code Description
S_OK
 Success.
E_INVALIDARG
 The argument psa is not valid.
E_UNEXPECTED
 The array could not be locked.

Remarks

The pointer in the array descriptor is valid until the SafeArrayUnlock function is called. Calls to SafeArrayLock can be nested, in which case an equal number of calls to SafeArrayUnlock are required.

An array cannot be deleted while it is locked.

Thread Safety

All public static (Shared in Visual Basic) members of the SAFEARRAY data type are thread safe. Instance members are not guaranteed to be thread safe.

For example, consider an application that uses the SafeArrayLock and SafeArrayUnlock functions. If these functions are called concurrently from different threads on the same SAFEARRAY data type instance, an inconsistent lock count may be created. This will eventually cause the SafeArrayUnlock function to return E_UNEXPECTED. You can prevent this by providing your own synchronization code.

Requirements

Requirement Value
Target Platform Windows
Header oleauto.h
Library OleAut32.lib
DLL OleAut32.dll