I´m noob with C++, i need the Visual Basic .NET (Compact Framework 1.1) P/Invoke calls of a Garmin Mobile XT API functions (http://developer.garmi n.com/mobile/mobile-sdk/). I transforms others calls, but these with pointers and handles is too hard to me. Here is the info:
-- Function prototypes --
QueAPIExport QueErrT16 QueCreatePoint( const QuePointType* point, QuePointHandle* handle );
QueAPIExport QueErrT16 QueRouteToPoint ( QuePointHandle point );
-- QueAPIExport --
#define QueAPIExport __declspec(dlli mport)
-- QueErrT16 --
typedef uint16 QueErrT16; enum { ... }
-- QuePointType --
typedef struct { ... } QuePointType;
-- QuePointHandle --
typedef uint32 QuePointHandle;
The best try (i think) for me was (sending a IntPtr.Zero to first function, an error for sure):
<DllImport("Que API.dll")> _
Public Shared Function QueCreatePoint( ByRef point As QuePointType, ByRef handle As IntPtr) As QueErrT16
End Function
<DllImport("Que API.dll")> _
Public Shared Function QueRouteToPoint (ByVal point As IntPtr) As QueErrT16
End Function
If it can help, i will write a part of code (C++) of a person that makes a API Wrapper (http://christian-helle.blogspot. com/2008/02/integrating-with-garmin-mobile-xt.html). I want make
the same but in VB.Net:
QuePointType point;
QuePositionData Type position;
memset(&positio n, 0, sizeof(QuePosit ionDataType));
position.lat = DecimalDegreesT oSemicircles(la titude);
position.lon = DecimalDegreesT oSemicircles(lo ngitude);
memset(&point, 0, sizeof(QuePoint Type));
point.posn = position;
QuePointHandle hPoint;
memset(&hPoint, 0, sizeof(QuePoint Handle));
err = QueCreatePoint( &point, &hPoint);
if (err == queErrNone && hPoint != queInvalidPoint Handle) {
err = QueRouteToPoint (hPoint);
}
I said i´m noob in C++, so i will tell you (maybe unneccessary) that nemset function is originally
from MEMORY.H and is prototype::
void * __cdecl memset(void *, int, size_t);
Thanks :)
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