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- '\"
- '\" Copyright 1989 Regents of the University of California
- '\" Permission to use, copy, modify, and distribute this
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- '\" $Header: /user6/ouster/tcl/man/RCS/CrtCommand.man,v 1.6 91/12/06 10:34:39 ouster Exp $ SPRITE (Berkeley)
- '\"
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- .HS Tcl_CreateCommand tcl
- .BS
- .SH NAME
- Tcl_CreateCommand, Tcl_DeleteCommand \- define application-specific command bindings
- .SH SYNOPSIS
- .nf
- \fB#include <tcl.h>\fR
- .sp
- \fBTcl_CreateCommand\fR(\fIinterp, cmdName, proc, clientData, deleteProc\fR)
- .sp
- int
- \fBTcl_DeleteCommand\fR(\fIinterp, cmdName\fR)
- .SH ARGUMENTS
- .AS Tcl_CmdDeleteProc (*deleteProc)()
- .AP Tcl_Interp *interp in
- Interpreter in which to create new command.
- .AP char *cmdName in
- Name of command to create or delete.
- .AP Tcl_CmdProc *proc in
- Implementation of new command: \fIproc\fR will be called whenever
- \fIcmdName\fR is invoked as a command.
- .AP ClientData clientData in
- Arbitrary one-word value to pass to \fIproc\fR and \fIdeleteProc\fR.
- .AP Tcl_CmdDeleteProc *deleteProc in
- Procedure to call before \fIcmdName\fR is deleted from the interpreter;
- allows for command-specific cleanup. If NULL, then no procedure is
- called before the command is deleted.
- .BE
-
- .SH DESCRIPTION
- .PP
- \fBTcl_CreateCommand\fR defines a new command in \fIinterp\fR and associates
- it with procedure \fIproc\fR such that whenever \fIcmdName\fR is
- invoked as a Tcl command (via a call to \fBTcl_Eval\fR) the Tcl interpreter
- will call \fIproc\fR
- to process the command. If there is already a command \fIcmdName\fR
- associated with the interpreter, it is deleted. \fIProc\fP should
- have arguments and result that match the type \fBTcl_CmdProc\fR:
- .nf
- .RS
- typedef int Tcl_CmdProc(
- .RS
- ClientData \fIclientData\fR,
- Tcl_Interp *\fIinterp\fR,
- int \fIargc\fR,
- char *\fIargv\fR[]);
- .RE
- .RE
- .fi
- When \fIproc\fR is invoked the \fIclientData\fP and \fIinterp\fR
- parameters will be copies of the \fIclientData\fP and \fIinterp\fR
- arguments given to \fBTcl_CreateCommand\fR.
- Typically, \fIclientData\fR points to an application-specific
- data structure that describes what to do when the command procedure
- is invoked. \fIArgc\fR and \fIargv\fR describe the arguments to
- the command, \fIargc\fR giving the number of arguments (including
- the command name) and \fIargv\fR giving the values of the arguments
- as strings. The \fIargv\fR array will contain \fIargc\fR+1 values;
- the first \fIargc\fR values point to the argument strings, and the
- last value is NULL.
- .PP
- \fIProc\fR must return an integer code that is either \fBTCL_OK\fR, \fBTCL_ERROR\fR,
- \fBTCL_RETURN\fR, \fBTCL_BREAK\fR, or \fBTCL_CONTINUE\fR. See the Tcl overview man page
- for details on what these codes mean. Most normal commands will only
- return \fBTCL_OK\fR or \fBTCL_ERROR\fR. In addition, \fIproc\fR must set
- \fIinterp->result\fR to point to a string value;
- in the case of a \fBTCL_OK\fR return code this gives the result
- of the command, and in the case of \fBTCL_ERROR\fR it gives an error message.
- The \fBTcl_SetResult\fR procedure provides an easy interface for setting
- the return value; for complete details on how the \fIinterp->result\fR
- field is managed, see the \fBTcl_Interp\fR man page.
- Before invoking a command procedure,
- \fBTcl_Eval\fR sets \fIinterp->result\fR to point to an empty string, so simple
- commands can return an empty result by doing nothing at all.
- .PP
- The contents of the \fIargv\fR array are copies made by the Tcl interpreter
- for the use of \fIproc\fR. \fIProc\fR may alter any of the strings
- in \fIargv\fR. However, the \fIargv\fR array
- is recycled as soon as \fIproc\fR returns, so \fIproc\fR must not set
- \fIinterp->result\fR to point anywhere within the \fIargv\fR values
- (call Tcl_SetResult
- with status \fBTCL_VOLATILE\fR if you want to return something from the
- \fIargv\fR array).
- .PP
- \fIDeleteProc\fR will be invoked when (if) \fIcmdName\fR is deleted.
- This can occur through a call to \fBTcl_DeleteCommand\fR or \fBTcl_DeleteInterp\fR,
- or by replacing \fIcmdName\fR in another call to Tcl_CreateCommand.
- \fIDeleteProc\fR is invoked before the command is deleted, and gives the
- application an opportunity to release any structures associated
- with the command. \fIDeleteProc\fR should have arguments and
- result that match the type \fBTcl_CmdDeleteProc\fR:
- .nf
- .RS
- .sp
- typedef void Tcl_CmdDeleteProc(ClientData \fIclientData\fR);
- .sp
- .RE
- .fi
- The \fIclientData\fR argument will be the same as the \fIclientData\fR
- argument passed to \fBTcl_CreateCommand\fR.
- .PP
- \fBTcl_DeleteCommand\fR deletes a command from a command interpreter.
- Once the call completes, attempts to invoke \fIcmdName\fR in
- \fIinterp\fR will result in errors.
- If \fIcmdName\fR isn't bound as a command in \fIinterp\fR then
- \fBTcl_DeleteCommand\fR does nothing and returns -1; otherwise
- it returns 0.
- There are no restrictions on \fIcmdName\fR: it may refer to
- a built-in command, an application-specific command, or a Tcl procedure.
-
- .SH KEYWORDS
- bind, command, create, delete, interpreter
-