GetFileSizeEx function

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GetFileSizeEx function

Applies to: desktop apps only

Retrieves the size of the specified file.

Syntax

BOOL WINAPI GetFileSizeEx(
  __in   HANDLE hFile,
  __out  PLARGE_INTEGER lpFileSize
);

Parameters

hFile [in]: A handle to the file. The handle must have been created with either the GENERIC_READ or GENERIC_WRITE access right or equivalent. For more information, see File Security and Access Rights.
lpFileSize [out]: A pointer to a LARGE_INTEGER structure that receives the file size, in bytes.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

Transacted Operations: If there is a transaction bound to the file handle, then the function returns information for the isolated file view.

Metro style apps: GetFileSizeEx is not supported. Use GetFileInformationByHandleEx.

Requirements

Minimum supported client	Windows XP
Minimum supported server	Windows Server 2003
Header	FileAPI.h (include Windows.h); WinBase.h on Windows Server 2008 R2, Windows 7, Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP (include Windows.h)
Library	Kernel32.lib
DLL	Kernel32.dll

typedef BOOL (WINAPI *GETFILESIZEEX)(HANDLE, PLARGE_INTEGER);
GETFILESIZEEX GetFileSizeEx;
------------------------------------------------------
__int64 ReturnData;
LARGE_INTEGER DataTemp;

HMODULE TheKernel32 = ::GetModuleHandleW(L"kernel32.dll");
if(TheKernel32 == NULL)
{
TheKernel32 = ::LoadLibraryW(L"kernel32.dll");
}
if(TheKernel32 != NULL)
{
GetFileSizeEx = (GETFILESIZEEX)::GetProcAddress(TheKernel32, "GetFileSizeEx");
if(GetFileSizeEx != NULL)
{
   if(::GetFileSizeEx(FileCode, &DataTemp) != 0) //檢查是否成功取得
   {
    ReturnData = DataTemp.QuadPart;
   }else{
    ReturnData = -1;
   }
}else{
   //error
   ReturnData = -1;
}
::FreeLibrary(TheKernel32); //釋放Library
}

MaxzRv

11/17/2010

C# syntax

Int64 should also work:

[DllImport("kernel32.dll", SetLastError=true)]
internal static extern bool GetFileSizeEx(SafeHandle hFile, ref long lpFileSize);

And please always use SafeHandle instead of IntPtr for handles!

Thomas Danecker

8/24/2009

vb.net syntax

<DllImport("kernel32.dll", SetLastError:=True)> 
Public Shared Function GetFileSizeEx(ByVal hFile As IntPtr, ByRef lpFileSize As LARGE_INTEGER) As Boolean
End Function

dmex

5/4/2009

C# syntax

[DllImport("kernel32.dll", SetLastError=true)]
internal static extern bool GetFileSizeEx(IntPtr hFile, ref LARGE_INTEGER lpFileSize);

dmex

5/4/2009

GetFileSizeEx function

GetFileSizeEx function

Syntax

Parameters

Return value

Remarks

Requirements

See also