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PRD_PRTCOMMAND
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PRD_SETERRHOOK
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Docs » Autodocs » printer.device » PRD_SETERRHOOK
PRD_SETERRHOOK -- set a hook for error messages (V44)
This command sets a hook that will be called if the printer.device
returns with an error from any other I/O command. This allows
printer drivers to use private error messages.
IO REQUEST
io_Message mn_ReplyPort set if quick I/O is not possible
io_Device preset by the call to OpenDevice
io_Command PRD_SETERRORHOOK
io_Hook a pointer to a hook that will be called
Two standard hook values a defined:
PDHOOK_NONE no error hook is to be used
PDHOOK_STD EasyRequest() is used to display the error message
The hook gets a pointer to the IORequest that caused the error as
the object and a pointer to the following structure as message:
struct PrtErrMsg {
ULONG pe_Version;
ULONG pe_ErrorLevel;
struct Window *pe_Window; /* window for EasyRequest() */
struct EasyStruct *pe_ES;
ULONG *pe_IDCMP;
APTR pe_ArgList;
};
pe_Version the message version number PDHOOK_VERSION
pe_ErrorLevel one of RETURN_WARN, RETURN_ERROR, RETURN_FAIL
pe_Window a window pointer (for EasyRequest()) or NULL
pe_ES a pointer to the error message structure
pe_IDCMP a pointer to IDCMP Flags for EasyRequest()
pe_ArgList a pointer to an array of arguments
The simplest case is to use that structure to call EasyRequest()
or to printf() a message to a console (use the error message from
pe_ES and the pe_ArgList).
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