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Tornado 2.0 User’s Guide You can prevent CrossWind from looking for the two .gdbinit files, if you choose, by setting the internal GDB parameter inhibit-gdbinit to yes. Because the initialization files execute in the order they are listed above, you have the opportunity to set this parameter before the debugger reads either .gdbinit file. To do this, insert the following line in your ~/.wind/gdb.tcl: gdb set inhibit-gdbinit yes 7.7.2 Tcl: Passing Control between the Two CrossWind Interpreters You can use the following specialized Tcl commands to pass control between the two CrossWind Tcl interpreters. uptcl From the Tcl interpreter integrated with the GDB command parser, uptcl executes the remainder of the line in the CrossWind graphical-interface Tcl interpreter. uptcl does not return a result. downtcl From the graphical-interface layer, downtcl executes the remainder of the line in the Tcl interpreter integrated with GDB. The result of downtcl is whatever GDB output the command generates. Use downtcl rather than ttySend if your goal is to capture the result for presentation in the graphical layer. ttySend From the graphical-interface layer, ttySend passes its string argument to GDB, exactly as if you had typed the argument in the command panel. A newline is not assumed; if you are writing a command and want it to be executed, include the newline character (\n) at the end of the string. Use ttySend rather than downtcl if your goal is to make information appear in the command panel (this can be useful for providing information to other GDB prompts besides the command prompt). The major use of uptcl is to experiment with customizing or extending the graphical interface. For example, if you have a file myXWind containing experimental Tcl code for extending the interface, you can try it out by entering the following in the command panel: (gdb) tcl uptcl source myXWind By contrast, downtcl and ttySend are likely to be embedded in Tcl procedures, because (in conjunction with the commands discussed in 7.6.3 Tcl: Invoking GDB Facilities, p.268) they are the path to debugger functionality from the graphical front end. 274
7 Debugger Most of the examples in 7.7.3 Tcl: Experimenting with CrossWind Extensions, p.275, below, center around calls to downtcl. 7.7.3 Tcl: Experimenting with CrossWind Extensions The examples in this section use the Tcl extensions summarized in Table 7-3. For detailed descriptions of these and other Tornado graphical building blocks in Tcl, see Tornado API Guide: UI Tcl. Table 7-3 Tornado UI Tcl Extensions Used in Example 7-2. 7 Tcl Extension dialogCreate dialogPost dialogUnpost dialogGetValue noticePost menuButtonCreate toolBarItemCreate … button toolBarItemCreate … space Description Define the layout of a form (dialog box). Includes a list of all graphical controls (such as buttons, text boxes, lists). The description of each control ends with the name of a Tcl callback used when the control is acted on. Display or update a named form (dialog). Remove a form (dialog) from the screen. Report the current value of a dialog graphical element (the contents of a text box, or the current selection in a list). Display a popup notice or a file selector. Add a command to an existing menu. Add a new button (and associated command string) to the button bar. Add space before new buttons in the button bar. Tcl: “This” Buttons for C++ In C++ programs, one particular named value has great special interest: this, which is a pointer to the object where the currently executing function is a member. Example 7-1 defines two buttons related to this: – A button, akin to the button, to display the address of this in the command panel. 275
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E X Resources E.1 Predefined X Reso
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Index Symbols ? (C/Tcl interpreter
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Index assembler options, specifying
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Index download options 260 download
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Index creating 100 linking 103 open
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Index info command (CrossWind) 258
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