How can use LONGLONG type of C++ Dll in 'Declare Function' statement?
 

Hi,
I have a dll. I want to use a function in the dll on Excel VBA.
The fuction is below.

int GetDiskSpaceLeft(DWORD dwID, LONGLONG *lpllSpace);

If this were "int GetDiskSpaceLeft(DWORD dwID, LONG *lpllSpace);",
I knew how to use that.
Private Declare Function GetDiskSpaceLeft lib 'xx.dll' (ByVal dwID as Long,
ByRef lSpace as Long)

However it's not "Long", but "LongLong"

How can I use the dll function?

How can use LONGLONG type of C++ Dll in 'Declare Function' stateme
 

One really quick'n'dirty solution I saw posted on a MSDN webpage is to use
the VB datatype Currency instead of LongLong, but you then have to remember
to scale it by a factor 10,000 as well. The snippet below is taken from the
following webpage:


http://msdn.microsoft.com/library/de...ightweight.asp

Surely, there must be cleaner ways of implementing support for LongLong, so
I'll keep on looking, and when I find something I'll post it here...

Cheers,
/MP

=================================================

Private Declare Function GetDiskFreeSpaceEx _
Lib "kernel32" Alias "GetDiskFreeSpaceExA" _
(ByVal lpRootPathName As String, _
lpFreeBytesAvailableToCaller As Currency, _
lpTotalNumberOfBytes As Currency, _
lpTotalNumberOfFreeBytes As Currency) As Long
Private Sub DiskInfo()
Dim cuAvailable As Currency
Dim cuTotal As Currency
Dim cuFree As Currency

Call GetDiskFreeSpaceEx("C:\", cuAvailable, _
cuTotal, cuFree)
Debug.Print "Disk space info" & vbCr & _
"Available : "; _
FormatByteSize(cuAvailable * 10000) & vbCr & _
"Total : "; _
FormatByteSize(cuTotal * 10000) & vbCr & _
"Free : "; _
FormatByteSize(cuFree * 10000) & vbCr & _
"Used : "; _
FormatByteSize((cuTotal - cuFree) * 10000)
End Sub

=================================================

"Zoo" wrote:

Hi,
I have a dll. I want to use a function in the dll on Excel VBA.
The fuction is below.

int GetDiskSpaceLeft(DWORD dwID, LONGLONG *lpllSpace);

If this were "int GetDiskSpaceLeft(DWORD dwID, LONG *lpllSpace);",
I knew how to use that.
Private Declare Function GetDiskSpaceLeft lib 'xx.dll' (ByVal dwID as Long,
ByRef lSpace as Long)

However it's not "Long", but "LongLong"

How can I use the dll function?

How can use LONGLONG type of C++ Dll in 'Declare Function' stateme
 

I tried that. It worked fine.
Thank you for your great help!

"Mat P:son" wrote in message
...
One really quick'n'dirty solution I saw posted on a MSDN webpage is to use
the VB datatype Currency instead of LongLong, but you then have to
remember
to scale it by a factor 10,000 as well. The snippet below is taken from
the
following webpage:



http://msdn.microsoft.com/library/de...ightweight.asp

Surely, there must be cleaner ways of implementing support for LongLong,
so
I'll keep on looking, and when I find something I'll post it here...

Cheers,
/MP

=================================================

Private Declare Function GetDiskFreeSpaceEx _
Lib "kernel32" Alias "GetDiskFreeSpaceExA" _
(ByVal lpRootPathName As String, _
lpFreeBytesAvailableToCaller As Currency, _
lpTotalNumberOfBytes As Currency, _
lpTotalNumberOfFreeBytes As Currency) As Long
Private Sub DiskInfo()
Dim cuAvailable As Currency
Dim cuTotal As Currency
Dim cuFree As Currency

Call GetDiskFreeSpaceEx("C:\", cuAvailable, _
cuTotal, cuFree)
Debug.Print "Disk space info" & vbCr & _
"Available : "; _
FormatByteSize(cuAvailable * 10000) & vbCr & _
"Total : "; _
FormatByteSize(cuTotal * 10000) & vbCr & _
"Free : "; _
FormatByteSize(cuFree * 10000) & vbCr & _
"Used : "; _
FormatByteSize((cuTotal - cuFree) * 10000)
End Sub

=================================================

"Zoo" wrote:

Hi,
I have a dll. I want to use a function in the dll on Excel VBA.
The fuction is below.

int GetDiskSpaceLeft(DWORD dwID, LONGLONG *lpllSpace);

If this were "int GetDiskSpaceLeft(DWORD dwID, LONG *lpllSpace);",
I knew how to use that.
Private Declare Function GetDiskSpaceLeft lib 'xx.dll' (ByVal dwID as
Long,
ByRef lSpace as Long)

However it's not "Long", but "LongLong"

How can I use the dll function?