Trf_CreateCtrlBlock(3) Interface to procedure for creation of encoder/decoder control structures.


#include <transform.h>

Trf_ControlBlock Trf_CreateCtrlBlock
       ClientData writeClientData,

       Trf_WriteProc *fun,

       Trf_Options optInfo,

       Tcl_Interp *interp,

       ClientData clientData



ClientData writeClientData
Arbitrary information given as clientdata to 'fun'.
Trf_WriteProc *fun
Vector to use for writing generated results.
Trf_Options optInfo
Options to configure the control.
Tcl_Interp *interp
Interpreter for error messages.
ClientData clientData
Arbitrary information, as defined in Trf_TypeDefinition.clientData.


The procedure has to create a control structure for an encoder/decoder. The structure must be initialized with the contents of the the option container. Return value is an opaque handle aof the control structure or NULL in case of failure. An error message should be left in the result area of the specified interpreter then.