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Old June 8th, 2004, 12:31 AM
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Default how to create a COM using VC++

i am a newbie in using COM tech.

I need to create a COM which contain a class as follow

class transcodeEngine
//assume the original code stream is in CPRL format, and no precint is used

transcodeEngine(char* inputfilename);
void transcodeEngine::transcoding(unsigned char * output,

int loc_center_x, int loc_center_y,
int size_x, int size_y,
int & count, int reduce_resolutions=0,
int components=3, int reduce_layers=0);
unsigned int num_tiles;
unsigned int num_components;
unsigned int num_layers;
unsigned int num_resolutions;
unsigned int num_tps_per_tile;
private: //help functions

void writeInt(unsigned char * s, unsigned int i, int count);
void parseTLM(unsigned char * s, int length);
void init();

i have use a ATL COM Appwizard to create a com. add a new atl object already.

i keep getting this error.

i need to pass in a parameter to the constructor of the class i created..seems like i cannot instaniate my object.

c:\program files\microsoft visual studio\vc98\atl\include\atlcom.h(1827) : error C2259: 'CComObject<class CTranscodeEngine>' : cannot instantiate abstract class due to following members:
c:\program files\microsoft visual studio\vc98\atl\include\atlcom.h(1823) : while compiling class-template member function 'long __stdcall ATL::CComCreator<class ATL::CComObject<class CTranscodeEngine> >::CreateInstance(void *,const struct _G UID &,void ** )'

really at a loss.. pls help.. let me know if u need any other info.


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