IHostMemoryManager::VirtualQuery Method

Artikkeli
09/15/2021

Serves as a logical wrapper for the corresponding Win32 function. The Win32 implementation of VirtualQuery retrieves information about a range of pages in the virtual address space of the calling process.

Syntax

HRESULT VirtualQuery (  
    [in]  void*    lpAddress,  
    [out] void*    lpBuffer,  
    [in]  SIZE_T   dwLength,  
    [out] SIZE_T*  pResult  
);

Parameters

lpAddress
[in] A pointer to the address in virtual memory to be queried.

lpBuffer
[out] A pointer to a structure that contains information about the specified memory region.

dwLength
[in] The size, in bytes, of the buffer that lpBuffer points to.

pResult
[out] A pointer to the number of bytes returned by the information buffer.

Return Value

HRESULT	Description
S_OK	`VirtualQuery` returned successfully.
HOST_E_CLRNOTAVAILABLE	The common language runtime (CLR) has not been loaded into a process, or the CLR is in a state in which it cannot run managed code or process the call successfully.
HOST_E_TIMEOUT	The call timed out.
HOST_E_NOT_OWNER	The caller does not own the lock.
HOST_E_ABANDONED	An event was canceled while a blocked thread or fiber was waiting on it.
E_FAIL	An unknown catastrophic failure occurred. When a method returns E_FAIL, the CLR is no longer usable within the process. Subsequent calls to hosting methods return HOST_E_CLRNOTAVAILABLE.

Remarks

VirtualQuery provides information about a range of pages in the virtual address space of the calling process. This implementation sets the value of the pResult parameter to the number of bytes returned in the information buffer, and returns an HRESULT value. In the Win32 VirtualQuery function, the return value is the buffer size. For more information, see the Windows Platform documentation.

Important

The operating system's implementation of VirtualQuery does not incur deadlock and can run to completion with random threads suspended in user code. Use great caution when implementing a hosted version of this method.

Requirements

Platforms: See System Requirements.

Header: MSCorEE.h

Library: Included as a resource in MSCorEE.dll

.NET Framework Versions: Available since 2.0

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