>-----Original Message-----
>The CF marshaller cannot handle this type of struct.
You'll have to
>manually marshal the data. I'd pass it as a large byte
array, then expose
>properties that retrieve and cast the specific offset
you're after.
>
>--
>Chris Tacke, eMVP
>Co-Founder and Advisory Board Member
>www.OpenNETCF.org
>---
>Windows CE Product Manager
Okay, that's the idea my partner and I had seen in the
advanced p/invoke article on msdn. It uses a Memory
class and allocates the memory it's going to need.
Here's what I'm going to try:
typedef struct GetLongRTS *GetLongRT;
struct GetLongRTS{
char sval[30];
LONG lval;
};
Public Structure GetLongRTS
Public sval As StringPtr
Public lval As Integer
End Structure
Public Structure StringPtr
Private szString As IntPtr
Public Sub New(ByVal s As Integer)
Me.szString = Memory.AllocHLocal(2 * (1 + s))
End Sub
Public Overrides Function ToString() As String
Return Marshal.PtrToStringUni(Me.szString)
End Function
Public Sub Free()
Memory.FreeHLocal(Me.szString)
End Sub
End Structure
Dim ptr As IntPtr = DBAccessFuncDecl.GetLongVal()
Dim obj As DBAccessFuncDecl.GetLongRTS
obj.sval = New DBAccessFuncDecl.StringPtr(30)
obj = CType(Marshal.PtrToStructure(ptr, GetType
(DBAccessFuncDecl.GetLongRTS)),
DBAccessFuncDecl.GetLongRTS)
Is that the idea??
And then we also have some 2d arrays, char[20][20].
Can this approach work?
Thanks again
Denis
>Applied Data Systems
>www.applieddata.net
>
>
>"Denis C" <(E-Mail Removed)> wrote in
message
>news:04cc01c3b3a3$3078f360$(E-Mail Removed)...
>> Hi,
>>
>> I have a C struct containing arrays of long, char and
>> bool. A pointer to this struct is returned from a
>> function. Is there a simple way to access them?
>>
>> Here is the C struct:
>>
>> typedef struct GetLongRTS *GetLongRT;
>> struct GetLongRTS{
>> char sval[30];
>> LONG lval[30];
>> bool bval[30];
>> };
>>
>> In the vb code I get *GetLongRT as an IntPtr. Then I
>> marshal it to a VB structure. Or atleast that is the
>> plan. What I don't know is what type the members of
the
>> Structure should be.
>>
>> Public Structure GetLongRT
>> Public sval As ??
>> Public lval As ??
>> Public bval As ??
>> end Structure
>>
>> I can do it with so called blittable types within the
>> structure but when I have arrays of then I am unsure
how
>> to proceed.
>>
>> Thanks,
>>
>> Denis
>
>
>.
>
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