Hi,
okay, thanks now my DLL function seems to accept the functions given,
but instead of running my program keeps crashing (with windows address
violation errors). I did some further investigations on that and figured
out that the contextH variable is not just an identifier as I thought,
but a quite complicated datastreamhandler.
Now to get it to work I additionally need to implement the following c
Structures:
------------------------------CODE-----------------------------------------
/* The internal data structure object of a stream */
typedef struct tagMemStreamData
{
cdChar mode;
cdInt32 lPos;
cdUInt32 dwVisibleSize;
cdUInt32 dwBufferSize;
cdChar *cpBuffer;
}MemStreamData;
typedef struct tagFilStreamData
{
cdChar szFileName[MAX_PATH];
HANDLE hFile;
}FilStreamData;
------------------------------\CODE----------------------------------------
This function just creates the pStream filestream (which is what I have
to do too)
------------------------------CODE-----------------------------------------
BOOL CreateMyFilStream( cdStream *pStream,
cdChar *szFileName )
{
FilStreamData *pFilStrm;
/* The domain for data is secured. */
pFilStrm = new FilStreamData;
if( pFilStrm == NULL )
{
return FALSE;
}
/* Data is changed the first stage. */
pFilStrm->hFile = INVALID_HANDLE_VALUE;
strcpy( pFilStrm->szFileName, szFileName );
pStream->contextH = (cdContext)pFilStrm;
pStream->close = _CloseMyFilStream;
pStream->open = _OpenMyFilStream;
pStream->read = _ReadMyFilStream;
pStream->seek = _SeekMyFilStream;
pStream->tell = _TellMyFilStream;
pStream->write = _WriteMyFilStream;
return TRUE;
}
------------------------------\CODE----------------------------------------
Now my solution is the following:
------------------------------CODE-----------------------------------------
class MemStreamData(Structure):
_fields_ = [("mode", c_byte),
("lPos", c_uint),
("dwVisibleSize", c_uint),
("dwBufferSize", c_uint),
("cpBuffer", POINTER(c_char))]
class FilStreamData (Structure):
_fields_ = [("szFileName", c_char * 30),
("hFile", c_uint)]
------------------------------\CODE----------------------------------------
and the code to fill all that with the right data is the following:
------------------------------CODE-----------------------------------------
datainfo = cdReleaseImageInfo()
databuf = c_char * 100000
cbuffer=MemStreamData()
cbuffer.mode = c_byte(0)
cbuffer.lPos = c_uint(0)
cbuffer.dwVisibleSize = c_uint(100000)
cbuffer.dwBufferSize = c_uint(100000)
#this line does not work, wrong datatype!?
cbuffer.cpBuffer = POINTER(databuf)
cpointer = cast(cbuffer, POINTER(c_uint))
stream = cdStream()
stream.contextH=cpointer
stream.open = cstreamopen(pystreamopen)
stream.close = cstreamclose(pystreamclose)
stream.write = cstreamwrite(pystreamwrite)
stream.tell = cstreamtell(pystreamtell)
stream.read = cstreamread(pystreamread)
data = cdStgMedium()
data.Type = c_uint(1)
data.u.pStream = POINTER(cdStream)(stream)
------------------------------\CODE----------------------------------------
Does anyone see where the errors are?
Best regards and thanks a lot,
Matt
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