cannot convert from <STRUCT_NAME> to ref <STRUCT_NAME>

[Gee]

I get the above error with this code and I can't figure out why? Any
ideas please? See code below - the actual error is included in the
code:
public struct NETRESOURCE
{
public Int32 dwScope ;
public Int32 dwType;
public Int32 dwDisplayType;
public Int32 dwUsage;
public string lpLocalName;
public string lpRemoteName;
public string lpComment;
public string lpProvider;
}
public const Int32 NO_ERROR = 0;
public const Int32 CONNECT_UPDATE_PROFILE = 0x1;
public const Int32 RESOURCETYPE_DISK = 0x1;
[System.Runtime.InteropService*s.DllImport(
"mpr.dll",
EntryPoint="WNetAddConnection2*A",
ExactSpelling=false,

CharSet=System.Runtime.Interop*Services.CharSet.An si,
SetLastError=true)]
public static extern Int32 WNetAddConnection2(
ref NETRESOURCE
lpNetResource,
[MarshalAs(UnmanagedType.LPStr*)] string
lpPassword,
[MarshalAs(UnmanagedType.LPStr*)] string
lpUserName,
Int32 dwFlags);
[System.Runtime.InteropService*s.DllImport(
"mpr.dll",
EntryPoint="WNetCancelConnecti*on2A",
ExactSpelling=false,

CharSet=System.Runtime.Interop*Services.CharSet.An si,
SetLastError=true)]
public static extern long WNetCancelConnection2(
string lpName,
long dwFlags,
long fForce);
private void Page_Load(object sender, System.EventArgs
e)
{
// Put user code to initialize the page here
Int32 intRes;
long linResult;
NETRESOURCE theNetResource;
Enterprise01.Toolkit objToolkit;
//' Set Resource Type
theNetResource.dwType = RESOURCETYPE_DISK;
//'Set Remote server & share name
theNetResource.lpRemoteName = "\\\\server\\share";
//'Set Local Path for share
theNetResource.lpLocalName = "F:";
//'Ensure the Username and Password are set correctly
//********************FIRST_PA*RAMETER_CAUSES_ERROR* *********************************

// \\server\wwwroot$\TEST\pgeCOMt*est.aspx.cs(85): The best
overloaded
method match for 'TEST.pgeCOMtest.WNetAddConnec*tion2(ref
TEST.pgeCOMtest.NETRESOURCE, string, string, int)' has some invalid
arguments
// \\server\wwwroot$\TEST\pgeCOMt*est.aspx.cs(86): Argument '1':
cannot
convert from 'TEST.pgeCOMtest.NETRESOURCE' to 'ref
TEST.pgeCOMtest.NETRESOURCE'
linResult = WNetAddConnection2(theNetResou*rce, "pwd", "dom_usr",
CONNECT_UPDATE_PROFILE);
//************************************************** ***********************************

objToolkit = new
Enterprise01.ToolkitClass();
intRes = objToolkit.OpenToolkit();
if(intRes > 0)
{
Response.Write("Error opening
toolkit: " +
objToolkit.LastErrorString);
intRes =
objToolkit.CloseToolkit();
if(intRes > 0)
{
Response.Write("Error
closing toolkit: " +
objToolkit.LastErrorString);
linResult =
WNetCancelConnection2(theNetRe*source.lpLocalName, 0,
0);
Response.End();
}
}
}

[Andy]

When calling a method that expects a parameter by ref, C# requires that
you put the ref keyword in when you write the call to the method, not
just in the method declaration.

I imagine that its to make it clear that you are passing something by
reference.

HTH
Andy

[Christof Nordiek]

Hi Gee

has to be
linResult = WNetAddConnection2( ref theNetResou*rce, "pwd", "dom_usr",
CONNECT_UPDATE_PROFILE);

If there is a ref in the declaration, there has also to be a ref in the
call.

Christof

"Gee" <in**@emmanuelsolutions.co.uk> schrieb im Newsbeitrag
news:11*********************@z14g2000cwz.googlegro ups.com...
I get the above error with this code and I can't figure out why? Any
ideas please? See code below - the actual error is included in the
code:
public struct NETRESOURCE
{
public Int32 dwScope ;
public Int32 dwType;
public Int32 dwDisplayType;
public Int32 dwUsage;
public string lpLocalName;
public string lpRemoteName;
public string lpComment;
public string lpProvider;
}
public const Int32 NO_ERROR = 0;
public const Int32 CONNECT_UPDATE_PROFILE = 0x1;
public const Int32 RESOURCETYPE_DISK = 0x1;
[System.Runtime.InteropService*s.DllImport(
"mpr.dll",
EntryPoint="WNetAddConnection2*A",
ExactSpelling=false,

CharSet=System.Runtime.Interop*Services.CharSet.An si,
SetLastError=true)]
public static extern Int32 WNetAddConnection2(
ref NETRESOURCE
lpNetResource,
[MarshalAs(UnmanagedType.LPStr*)] string
lpPassword,
[MarshalAs(UnmanagedType.LPStr*)] string
lpUserName,
Int32 dwFlags);
[System.Runtime.InteropService*s.DllImport(
"mpr.dll",
EntryPoint="WNetCancelConnecti*on2A",
ExactSpelling=false,

CharSet=System.Runtime.Interop*Services.CharSet.An si,
SetLastError=true)]
public static extern long WNetCancelConnection2(
string lpName,
long dwFlags,
long fForce);
private void Page_Load(object sender, System.EventArgs
e)
{
// Put user code to initialize the page here
Int32 intRes;
long linResult;
NETRESOURCE theNetResource;
Enterprise01.Toolkit objToolkit;
//' Set Resource Type
theNetResource.dwType = RESOURCETYPE_DISK;
//'Set Remote server & share name
theNetResource.lpRemoteName = "\\\\server\\share";
//'Set Local Path for share
theNetResource.lpLocalName = "F:";
//'Ensure the Username and Password are set correctly
//********************FIRST_PA*RAMETER_CAUSES_ERROR* *********************************

// \\server\wwwroot$\TEST\pgeCOMt*est.aspx.cs(85): The best
overloaded
method match for 'TEST.pgeCOMtest.WNetAddConnec*tion2(ref
TEST.pgeCOMtest.NETRESOURCE, string, string, int)' has some invalid
arguments
// \\server\wwwroot$\TEST\pgeCOMt*est.aspx.cs(86): Argument '1':
cannot
convert from 'TEST.pgeCOMtest.NETRESOURCE' to 'ref
TEST.pgeCOMtest.NETRESOURCE'
linResult = WNetAddConnection2(theNetResou*rce, "pwd", "dom_usr",
CONNECT_UPDATE_PROFILE);
//************************************************** ***********************************

objToolkit = new
Enterprise01.ToolkitClass();
intRes = objToolkit.OpenToolkit();
if(intRes > 0)
{
Response.Write("Error opening
toolkit: " +
objToolkit.LastErrorString);
intRes =
objToolkit.CloseToolkit();
if(intRes > 0)
{
Response.Write("Error
closing toolkit: " +
objToolkit.LastErrorString);
linResult =
WNetCancelConnection2(theNetRe*source.lpLocalName, 0,
0);
Response.End();
}
}
}

[Gee]

Thanks Andy and Christof!

I've also tried that but that gives me this error:
Use of unassigned local variable 'theNetResource'

Not sure what that means, but if it means that I've not assigned it a
value, in the code I've instantiated it and assigned values to it's
properties.

Any ideas?

Cheers,

-Gee.

[Adam Clauss]

Can you post the code where you instantiate it and then call the function?

Thanks,
Adam Clauss
"Gee" <in**@emmanuelsolutions.co.uk> wrote in message
news:11**********************@g44g2000cwa.googlegr oups.com...

Thanks Andy and Christof!

I've also tried that but that gives me this error:
Use of unassigned local variable 'theNetResource'

Not sure what that means, but if it means that I've not assigned it a
value, in the code I've instantiated it and assigned values to it's
properties.

Any ideas?

Cheers,

-Gee.

[Adam Clauss]

Sorry, ignore previous post.

I do not see where you instantiate the NETRESOURCE. Add "= new
NETRESOURCE();"

NETRESOURCE theNetResource = new NETRESOURCE(); <---- ADD THIS
Enterprise01.Toolkit objToolkit;

---
Adam Clauss

"Gee" <in**@emmanuelsolutions.co.uk> wrote in message
news:11**********************@g44g2000cwa.googlegr oups.com...

Thanks Andy and Christof!

I've also tried that but that gives me this error:
Use of unassigned local variable 'theNetResource'

Not sure what that means, but if it means that I've not assigned it a
value, in the code I've instantiated it and assigned values to it's
properties.

Any ideas?

Cheers,

-Gee.

[Gee]

Doh!

Simple as that eh! Damnit, it's these little oversights that take ages
to figure out! :-)

Thanks Adam!

-Gee.

[Hans Kesting]

Gee wrote:

Thanks Andy and Christof!

I've also tried that but that gives me this error:
Use of unassigned local variable 'theNetResource'

Not sure what that means, but if it means that I've not assigned it a
value, in the code I've instantiated it and assigned values to it's
properties.

Any ideas?

Cheers,

-Gee.

See also http://www.yoda.arachsys.com/csharp/parameters.html

[Adam Clauss]

It's always the little ones that take forever :)

Adam

"Gee" <in**@emmanuelsolutions.co.uk> wrote in message
news:11**********************@g14g2000cwa.googlegr oups.com...

Doh!

Simple as that eh! Damnit, it's these little oversights that take ages
to figure out! :-)

Thanks Adam!

-Gee.