The docs say CFUNCTYPE(restype, *argtypes), so:
cstreamopen = CFUNCTYPE(c_uint, c_ushort, c_uint)
is saying that the result type is c_uint, not void. I think you need:
cstreamopen = CFUNCTYPE(None, c_uint, c_ushort, c_uint)
instead.
Hm, thanks, now I can access my data in the functions and also write
them but the program keeps terminating right at the point when the
"open" function finishes. Unfortunately everything closes and I get no
error messages.
I did some additional work in the meantime and changed my code so it has
the correct datatypes now:
--------------------------CODE--------------------------------------------
def pystreamopen (contextH, mode, pErr):
print "opening..."
print contextH.contents.dwBufferSize #just to check the structure
print mode #tells about what the DLL wants to do with this stream
contextH.contents.mode = c_byte(5) #5=Permission to read and write
contextH.contents.lPos = c_uint(0) #start position
print pErr.contents
pErr.contents = c_uint(0)
cstreamopen = CFUNCTYPE(None, POINTER(MemStreamData), c_ushort,
POINTER(c_uint))
def pystreamclose (contextH, pErr):
print "closing..."
pass
cstreamclose = CFUNCTYPE(None, POINTER(MemStreamData), POINTER(c_uint))
def pystreamread (contextH, pBuf, pBufsize, pErr):
print "reading..."
pass
cstreamread = CFUNCTYPE(None, POINTER(MemStreamData), c_uint, c_uint,
POINTER(c_uint))
def pystreamtell (contextH, pErr):
print "telling...
.
.
.etc...
--------------------------/CODE--------------------------------------------
and the function call:
--------------------------CODE--------------------------------------------
errorcode = cdsdk.CDGetReleasedData(devicehandle, byref(cbfunct),
c_uint(0), c_uint(0), byref(datainfo), POINTER(cdStgMedium)(data))
--------------------------/CODE--------------------------------------------
while it's running my program prints the following and then
exits/terminates:
>>> opening...990001
>>> 2
>>> c_ulong(0L)
>>> Script terminated. ##This is a message by my editor (SPE)
I also tried different editors, but get the same result...
Anyway, meanwhile decided to try a different approach. Maybe I have
more luck by having the function write the data directly into a file on
the HDD.
Doe anyone know how to translate the following into Python/ctypes?
I googled quite a lot before but all topic-related I found was my own
posting here in this NG :S
--------------------------CODE--------------------------------------------
pFilStrm->hFile = CreateFile( pFilStrm->szFileName,
dwDesiredAccess, dwShareMode, NULL,
dwCreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL );
--------------------------/CODE--------------------------------------------
This function is obviously a default C-function that generates a file
and returns a c-handle to that file. In my case I'd need exactly such a
handle to get things working...
Furthermore there's a writefile function I'd need to translate too:
--------------------------CODE--------------------------------------------
WriteFile( pFilStrm->hFile, pBuf, dwNumberOfBytesToWrite, pBufsize, NULL );
--------------------------/CODE--------------------------------------------
Ideas?
Thanks and best wishes,
Matt
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