Hello.

I'm running Win Mobile 5.0 on an ARM XScale, and writing in VS2005 - Visual 
Basic with Compact Framework 2.0.

I want to find out (programmaticaly) how much storage space is available on 
the Pocket PC, both in main storage ("\") and on a storage card ("\Storage 
Card\"), and show a message box if either has less than 16 MB free.

I've tried the following inside a "Public Class Form1" but get a 
NotSupportedException error:

Public Declare Function GetDiskFreeSpaceExW Lib "CoreDll.Dll" ( _
        ByRef DirectoryName As String, _
        ByRef FreeBytesAvailable As Int64, _
        ByRef TotalNumberOfBytes As Int64, _
        ByRef TotalNumberOfFreeBytes As Int64) As Boolean

Dim res As Boolean

res = Form1.GetDiskFreeSpaceExW("\", FreeBytesAvailable, TotalNumberOfBytes, 
TotalNumberOfFreeBytes)

MsgBox(FreeBytesAvailable.ToString)

I've also tried using GlobalMemoryStatus and GetSystemMemoryDivision - these 
work without raising an exception, but seem to give me program memory instead 
of storage space.

You need to use the method GetDiskSpaceFreeEx, Do not specify the wide 
character version.  HEre is a link that should help:

http://msdn2.microsoft.com/en-US/library/aa912270.aspx

Rick D.
Contractor

"ve3wtj" wrote:


> Hello.
> 
> I'm running Win Mobile 5.0 on an ARM XScale, and writing in VS2005 - Visual 
> Basic with Compact Framework 2.0.
> 
> I want to find out (programmaticaly) how much storage space is available on 
> the Pocket PC, both in main storage ("\") and on a storage card ("\Storage 
> Card\"), and show a message box if either has less than 16 MB free.
> 
> I've tried the following inside a "Public Class Form1" but get a 
> NotSupportedException error:
> 
> Public Declare Function GetDiskFreeSpaceExW Lib "CoreDll.Dll" ( _
>         ByRef DirectoryName As String, _
>         ByRef FreeBytesAvailable As Int64, _
>         ByRef TotalNumberOfBytes As Int64, _
>         ByRef TotalNumberOfFreeBytes As Int64) As Boolean
> 
> Dim res As Boolean
> 
> res = Form1.GetDiskFreeSpaceExW("\", FreeBytesAvailable, TotalNumberOfBytes, 
> TotalNumberOfFreeBytes)
> 
> MsgBox(FreeBytesAvailable.ToString)
> 
> I've also tried using GlobalMemoryStatus and GetSystemMemoryDivision - these 
> work without raising an exception, but seem to give me program memory instead 
> of storage space.

Thanks for the suggestion, but dropping the W didn't make a difference - I 
still get 
a "NotSupportedException".

I've since been able to use GetStoreInformation() to acquire main storage 
space, but still no success with '\Storage Card'.


"dbgrick" wrote:


> You need to use the method GetDiskSpaceFreeEx, Do not specify the wide 
> character version.  HEre is a link that should help:
> 
> http://msdn2.microsoft.com/en-US/library/aa912270.aspx
> 
> Rick D.
> Contractor
> 
> "ve3wtj" wrote:
> 
> > Hello.
> > 
> > I'm running Win Mobile 5.0 on an ARM XScale, and writing in VS2005 - Visual 
> > Basic with Compact Framework 2.0.
> > 
> > I want to find out (programmaticaly) how much storage space is available on 
> > the Pocket PC, both in main storage ("\") and on a storage card ("\Storage 
> > Card\"), and show a message box if either has less than 16 MB free.
> > 
> > I've tried the following inside a "Public Class Form1" but get a 
> > NotSupportedException error:
> > 
> > Public Declare Function GetDiskFreeSpaceExW Lib "CoreDll.Dll" ( _
> >         ByRef DirectoryName As String, _
> >         ByRef FreeBytesAvailable As Int64, _
> >         ByRef TotalNumberOfBytes As Int64, _
> >         ByRef TotalNumberOfFreeBytes As Int64) As Boolean
> > 
> > Dim res As Boolean
> > 
> > res = Form1.GetDiskFreeSpaceExW("\", FreeBytesAvailable, TotalNumberOfBytes, 
> > TotalNumberOfFreeBytes)
> > 
> > MsgBox(FreeBytesAvailable.ToString)
> > 
> > I've also tried using GlobalMemoryStatus and GetSystemMemoryDivision - these 
> > work without raising an exception, but seem to give me program memory instead 
> > of storage space.

Looks like I needed to pass the directory name by value instead of by 
reference.  Issue resolved.
-- 
David Friesen, B.Eng


"ve3wtj" wrote:


> Thanks for the suggestion, but dropping the W didn't make a difference - I 
> still get 
> a "NotSupportedException".
> 
> I've since been able to use GetStoreInformation() to acquire main storage 
> space, but still no success with '\Storage Card'.
> 
> 
> "dbgrick" wrote:
> 
> > You need to use the method GetDiskSpaceFreeEx, Do not specify the wide 
> > character version.  HEre is a link that should help:
> > 
> > http://msdn2.microsoft.com/en-US/library/aa912270.aspx
> > 
> > Rick D.
> > Contractor
> > 
> > "ve3wtj" wrote:
> > 
> > > Hello.
> > > 
> > > I'm running Win Mobile 5.0 on an ARM XScale, and writing in VS2005 - Visual 
> > > Basic with Compact Framework 2.0.
> > > 
> > > I want to find out (programmaticaly) how much storage space is available on 
> > > the Pocket PC, both in main storage ("\") and on a storage card ("\Storage 
> > > Card\"), and show a message box if either has less than 16 MB free.
> > > 
> > > I've tried the following inside a "Public Class Form1" but get a 
> > > NotSupportedException error:
> > > 
> > > Public Declare Function GetDiskFreeSpaceExW Lib "CoreDll.Dll" ( _
> > >         ByRef DirectoryName As String, _
> > >         ByRef FreeBytesAvailable As Int64, _
> > >         ByRef TotalNumberOfBytes As Int64, _
> > >         ByRef TotalNumberOfFreeBytes As Int64) As Boolean
> > > 
> > > Dim res As Boolean
> > > 
> > > res = Form1.GetDiskFreeSpaceExW("\", FreeBytesAvailable, TotalNumberOfBytes, 
> > > TotalNumberOfFreeBytes)
> > > 
> > > MsgBox(FreeBytesAvailable.ToString)
> > > 
> > > I've also tried using GlobalMemoryStatus and GetSystemMemoryDivision - these 
> > > work without raising an exception, but seem to give me program memory instead 
> > > of storage space.

A String is a reference type, so it's already being passed as a pointer. 
Passing it ByRef sends a pointer to a pointer, which is the likely cause of 
failure.


-- 

Chris Tacke, Embedded MVP
OpenNETCF Consulting
Managed Code in an Embedded World
www.OpenNETCF.com


"ve3wtj"  wrote in message 
news:A6469684-AEC3-4659-90BB-54EC6587ADF2@microsoft.com...

> Thanks for the suggestion, but dropping the W didn't make a difference - I
> still get
> a "NotSupportedException".
>
> I've since been able to use GetStoreInformation() to acquire main storage
> space, but still no success with '\Storage Card'.
>
>
> "dbgrick" wrote:
>
>> You need to use the method GetDiskSpaceFreeEx, Do not specify the wide
>> character version.  HEre is a link that should help:
>>
>> http://msdn2.microsoft.com/en-US/library/aa912270.aspx
>>
>> Rick D.
>> Contractor
>>
>> "ve3wtj" wrote:
>>
>> > Hello.
>> >
>> > I'm running Win Mobile 5.0 on an ARM XScale, and writing in VS2005 - 
>> > Visual
>> > Basic with Compact Framework 2.0.
>> >
>> > I want to find out (programmaticaly) how much storage space is 
>> > available on
>> > the Pocket PC, both in main storage ("\") and on a storage card 
>> > ("\Storage
>> > Card\"), and show a message box if either has less than 16 MB free.
>> >
>> > I've tried the following inside a "Public Class Form1" but get a
>> > NotSupportedException error:
>> >
>> > Public Declare Function GetDiskFreeSpaceExW Lib "CoreDll.Dll" ( _
>> >         ByRef DirectoryName As String, _
>> >         ByRef FreeBytesAvailable As Int64, _
>> >         ByRef TotalNumberOfBytes As Int64, _
>> >         ByRef TotalNumberOfFreeBytes As Int64) As Boolean
>> >
>> > Dim res As Boolean
>> >
>> > res = Form1.GetDiskFreeSpaceExW("\", FreeBytesAvailable, 
>> > TotalNumberOfBytes,
>> > TotalNumberOfFreeBytes)
>> >
>> > MsgBox(FreeBytesAvailable.ToString)
>> >
>> > I've also tried using GlobalMemoryStatus and GetSystemMemoryDivision - 
>> > these
>> > work without raising an exception, but seem to give me program memory 
>> > instead
>> > of storage space.