int Tcl_LinkVar(interp, varName, addr, type)
- Tcl_Interp *interp (in)
Interpreter that contains varName. Also used by
Tcl_LinkVar()to return error messages.
- char *varName (in)
Name of global variable. Must be in writable memory: Tcl may make temporary modifications to it while parsing the variable name.
- char *addr (in)
Address of C variable that is to be linked to varName.
- int type (in)
Type of C variable. Must be one of TCL_LINK_INT, TCL_LINK_DOUBLE, TCL_LINK_BOOLEAN, or TCL_LINK_STRING, optionally OR'ed with TCL_LINK_READ_ONLY to make Tcl variable read-only.
The type argument specifies the type of the C variable, and must have one of the following values, optionally OR'ed with TCL_LINK_READ_ONLY:
The C variable is of type int. Any value written into the Tcl variable must have a proper integer form acceptable to
Tcl_GetInt(); attempts to write non-integer values into varName will be rejected with Tcl errors.
The C variable is of type double. Any value written into the Tcl variable must have a proper real form acceptable to
Tcl_GetDouble(); attempts to write non-real values into varName will be rejected with Tcl errors.
The C variable is of type int. If its value is zero then it will read from Tcl as 0; otherwise it will read from Tcl as 1. Whenever varName is modified, the C variable will be set to a 0 or 1 value. Any value written into the Tcl variable must have a proper boolean form acceptable to
Tcl_GetBoolean(); attempts to write non-boolean values into varName will be rejected with Tcl errors.
The C variable is of type char *. If its value is not null then it must be a pointer to a string allocated with
Tcl_Alloc(). Whenever the Tcl variable is modified the current C string will be freed and new memory will be allocated to hold a copy of the variable's new value. If the C variable contains a null pointer then the Tcl variable will read as NULL.
If the TCL_LINK_READ_ONLY flag is present in type then the variable will be read-only from Tcl, so that its value can only be changed by modifying the C variable. Attempts to write the variable from Tcl will be rejected with errors.
Windows Server 2012. Windows 8.1. Windows Server 2012 R2. Windows 10. Windows Server 2016. Windows Server 2019.
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