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-.\" ========================================================================
-.\"
-.IX Title "xpaconvert n"
-.TH xpaconvert n "July 23, 2013" "version 2.1.15" "SAORD Documentation"
-.\" For nroff, turn off justification. Always turn off hyphenation; it makes
-.\" way too many mistakes in technical documents.
-.if n .ad l
-.nh
-.SH "NAME"
-\&\fBXPAConvert: Converting the \s-1XPA\s0 \s-1API\s0 to 2.0\fR
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-This document describes tips for converting from xpa 1.0 (Xt-based
-xpa) to xpa 2.0 (socket-based xpa).
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-The following are tips for converting from xpa 1.0 (Xt-based xpa) to
-xpa 2.0 (socket-based xpa). The changes are straight-forward and
-almost can be done automatically (we used editor macros for most of
-the conversion).
-.IP "\(bu" 4
-The existence of the cpp \s-1XPA_VERSION\s0 directive to distinguish between 1.0
-(where it is not defined) and 2.0 (where it is defined).
-.IP "\(bu" 4
-Remove the first widget argument from all send and receive server
-callbacks. Also change first 2 arguments from XtPointer to void
-*. For example:
-.Sp
-#ifdef \s-1XPA_VERSION\s0
-static void XPAReceiveFile(client_data, call_data, paramlist, buf, len)
- void *client_data;
- void *call_data;
- char *paramlist;
- char *buf;
- int len;
-#else
-static void XPAReceiveFile(w, client_data, call_data, paramlist, buf, len)
- Widget w;
- XtPointer client_data;
- XtPointer call_data;
- char *paramlist;
- char *buf;
- int len;
-#endif
-.IP "\(bu" 4
-Server callbacks should be declared as returning int instead
-of void. They now should return 0 for no errors, \-1 for error.
-.IP "\(bu" 4
-The mode flags have changed when defining \s-1XPA\s0 server callbacks.
-The old \fIS\fR flag (save buffer) is replaced by \fIfreebuf=false\fR.
-The old \fIE\fR flag (empty buffer is \s-1OK\s0) is no longer used (it
-was an artifact of the X implementation).
-.IP "\(bu" 4
-Change \fINewXPACommand()\fR to \fIXPAcmdNew()\fR, with the new calling sequence:
-.Sp
-.Vb 1
-\& xpa = NewXPACommand(toplevel, NULL, prefix, NULL);
-.Ve
-.Sp
-is changed to:
-.Sp
-.Vb 1
-\& xpa = XPACmdNew(xclass, name);
-.Ve
-.IP "\(bu" 4
-Change the \fIAddXPACommand()\fR subroutine name to XPACmdAdd (with the same
-calling sequence):
-.Sp
-.Vb 3
-\& AddXPACommand(xpa, "file",
-\& "\etdisplay a new file\en\et\et requires: filename",
-\& NULL, NULL, NULL, XPAReceiveFile, text, NULL);
-.Ve
-.Sp
-is changed to:
-.Sp
-.Vb 3
-\& XPACmdAdd(xpa, "file",
-\& "\etdisplay a new file\en\et\et requires: filename",
-\& NULL, NULL, NULL, XPAReceiveFile, text, NULL);
-.Ve
-.IP "\(bu" 4
-The \fIXPAXtAppInput()\fR routine should be called just before \fIXtAppMainLoop()\fR
-to add xpa fds to the Xt event loop:
-.Sp
-.Vb 2
-\& /* add the xpas to the Xt loop */
-\& XPAXtAddInput(app, NULL);
-\&
-\& /* process events */
-\& XtAppMainLoop(app);
-.Ve
-.IP "\(bu" 4
-Change \fINewXPA()\fR to \fIXPANew()\fR and call \fIXPAXtAddInput()\fR if the XtAppMainLoop
-routine already has been entered:
-.Sp
-.Vb 4
-\& xpa = NewXPA(saotng\->xim\->toplevel, prefix, xparoot,
-\& "FITS data or image filename\en\et\et options: file type",
-\& XPASendData, new, NULL,
-\& XPAReceiveData, new, "SE");
-.Ve
-.Sp
-is changed to:
-.Sp
-.Vb 6
-\& sprintf(tbuf, "%s.%s", prefix, xparoot);
-\& xpa = XPANew("SAOTNG", tbuf,
-\& "FITS data or image filename\en\et\et options: file type",
-\& XPASendData, new, NULL,
-\& XPAReceiveData, new, "SE");
-\& XPAXtAddInput(XtWidgetToApplicationContext(saotng\->xim\->toplevel), xpa);
-.Ve
-.IP "\(bu" 4
-Change \fIXPAInternalReceiveCommand()\fR to \fIXPACmdInternalReceive()\fR
-remove first argument in the calling sequence):
-.Sp
-.Vb 3
-\& XPAInternalReceiveCommand(im\->saotng\->xim\->toplevel,
-\& im\->saotng, im\->saotng\->commands,
-\& "zoom reset", NULL, 0);
-.Ve
-.Sp
-is changed to:
-.Sp
-.Vb 2
-\& XPACmdInternalReceive(im\->saotng, im\->saotng\->commands,
-\& "zoom reset", NULL, 0);
-.Ve
-.IP "\(bu" 4
-Change DestroyXPA to XPAFree:
-.Sp
-.Vb 1
-\& DestroyXPA(im\->dataxpa);
-.Ve
-.Sp
-is changed to:
-.Sp
-.Vb 1
-\& XPAFree(im\->dataxpa);
-.Ve
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-See xpa(n) for a list of \s-1XPA\s0 help pages