Tk_Window and TkWindow
in [TCL]
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From: Kevin Walzer on 4 Nov 2009 22:27 I'm confused about something I frequently see in source files that make use of Tk's C API: Tk_Window and TkWindow. Here's an example that returns the interpreter associated with a Tk window: Tcl_Interp * ip(Tk_Window tkwin) { if (tkwin != NULL && ((TkWindow *)tkwin)->mainPtr != NULL) { return ((TkWindow *)tkwin)->mainPtr->interp; } return NULL; } I understand that Tk_Window refers to a Tk window; it's a publicly exported function defined in the man pages. But what's a "TkWindow"? It appears to be some sort of struct, and I see a reference to it in tkInt.h, but I see no discussion of it in the man pages. As a result, I don't understand how to use it in my extension code, or even if I should use it. Can someone clarify this for me? --Kevin -- Kevin Walzer Code by Kevin http://www.codebykevin.com
From: George Petasis on 5 Nov 2009 03:29 O/H Kevin Walzer έγραψε: > I'm confused about something I frequently see in source files that make > use of Tk's C API: Tk_Window and TkWindow. Here's an example that > returns the interpreter associated with a Tk window: > > Tcl_Interp * ip(Tk_Window tkwin) { > if (tkwin != NULL && ((TkWindow *)tkwin)->mainPtr != NULL) { > return ((TkWindow *)tkwin)->mainPtr->interp; > } > return NULL; > } > > I understand that Tk_Window refers to a Tk window; it's a publicly > exported function defined in the man pages. > > But what's a "TkWindow"? It appears to be some sort of struct, and I see > a reference to it in tkInt.h, but I see no discussion of it in the man > pages. As a result, I don't understand how to use it in my extension > code, or even if I should use it. > > Can someone clarify this for me? > > --Kevin > TkWindow is an internal to Tk structure. It is not supposed to be used by extensions. Tk_Window is the structure that can be used by extensions... In essence, both are the same structure. But Tk_Window has some structure fields hidden, because they are internal to Tk... George
From: Donal K. Fellows on 5 Nov 2009 04:36 On 5 Nov, 03:27, Kevin Walzer <k...(a)codebykevin.com> wrote: > As a result, I don't understand how to use [TkWindow] in my extension > code, or even if I should use it. It's not described because is in fact part of the implementation, not the interface. Don't use it if you're not writing Tk itself. Donal.
From: George Petasis on 5 Nov 2009 11:39 O/H Donal K. Fellows έγραψε: > On 5 Nov, 03:27, Kevin Walzer <k...(a)codebykevin.com> wrote: >> As a result, I don't understand how to use [TkWindow] in my extension >> code, or even if I should use it. > > It's not described because is in fact part of the implementation, not > the interface. Don't use it if you're not writing Tk itself. > > Donal. There are cases where you cannot avoid using it. For sure I have used it at least in one of my extensions... (I don't remeber in which one though :-) ) George
From: Don Porter on 5 Nov 2009 11:56
George Petasis wrote: > O/H Donal K. Fellows έγραψε: >> On 5 Nov, 03:27, Kevin Walzer <k...(a)codebykevin.com> wrote: >>> As a result, I don't understand how to use [TkWindow] in my extension >>> code, or even if I should use it. >> >> It's not described because is in fact part of the implementation, not >> the interface. Don't use it if you're not writing Tk itself. >> >> Donal. > > There are cases where you cannot avoid using it. For sure I have used it > at least in one of my extensions... > (I don't remeber in which one though :-) ) Where can we find your Feature Request laying out the inadequacies of the Tk public interface? -- | Don Porter Mathematical and Computational Sciences Division | | donald.porter(a)nist.gov Information Technology Laboratory | | http://math.nist.gov/~DPorter/ NIST | |______________________________________________________________________| |