Trying to Interop a functionality from the Outside In API from Oracle.
Have the following function:
SCCERR EXOpenExport {
VTHDOC hDoc,
VTDWORD dwOutputId,
VTDWORD dwSpecType,
VTLPVOID pSpec,
VTDWORD dwFlags,
VTSYSPARAM dwReserved,
VTLPVOID pCallbackFunc,
VTSYSPARAM dwCallbackData,
VTLPHEXPORT phExport);
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From the header files I reduced the parameters to:
typedef VTSYSPARAM VTHDOC, VTLPHDOC *
typedef DWORD_PTR VTSYSPARAM
typedef unsigned long DWORD_PTR
typedef unsigned long VTDWORD
typedef VTVOID* VTLPVOID
#define VTVOID void
typedef VTHDOC VTHEXPORT, *VTLPEXPORT
These are for 32 bit windows
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Going through the header files, the example programs, and the documentation I found:
1. That pSpec could be a pointer to a buffer or NULL, so I set it to a IntPtr.Zero (documentation).
2. That dwFlags and dwReserved according to the documentation "Must be set by the developer to 0".
3. That pCallbackFunc can be set to NULL if I don't want to handle callbacks.
6. That the last two are based on structs that I wrote C# wrappers for using the [StructLayout(LayoutKind.Sequential)]. Then instatiated an instance and generated the parameters by first creating a IntPtr with Marshal.AllocHGlobal(Marshal.SizeOf(instance)), then getting the address value which is passed as a uint for dwCallbackData and a IntPtr for phExport.
The final parameter list is as follows:
phDoc as a IntPtr which was loaded with an address by the DAOpenDocument function called before
dwOutputId as uint set to 1535 which represents FI_JPEGFIF
dwSpecType as int set to 2 which represents IOTYPE_ANSIPATH
pSpec as an IntPtr.Zero where the output will be written
dwFlags as uint set to 0 as directed
dwReserved as uint set to 0 as directed
pCallbackFunc as IntPtr set to NULL as I will handle results
dwCallBackDate as uint the address of a buffer for a struct
phExport as IntPtr to another struct buffer
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still get an undefined error from the API.
Jim