I've finally figured out what was happening here.
The issue was not related to Cygwin.
For those interested:
I compile my app using libraries from Exceed, then later use Cygwin as my X
Server.
I had (2) problems here:
(1) I was using the wrong version of the Exceed DLLs at runtime.
(2) There appears to be a bug in Exceed 15 where if you set the environment
variable "UserDir", it causes the cut/paste functionality to not work. There
was a previous bug where NOT setting this variable caused other issues.
thanks for all your help!
From: Stone, Timothy M
Sent: Wednesday, November 8, 2023 10:24 AM
To: 'cygwin@cygwin.com' <cygwin@cygwin.com>
Subject: RE: [EXT] Re: XWin copy/paste succeeds on Windows 7, crashes on
Windows 11 Enterprise.
I have made an important discovery here. I've been using "release" mode when
compiling, and had the following results:
On Windows 11 enterprise (release):
When using "translations_ignore", it correctly just prints "Ignoring" every
time I cut/copy/paste.
When using "translations_copypaste", the program crashes.
On Windows 7 professional (release):
When using "translations_ignore", it correctly just prints "Ignoring" every
time I cut/copy/paste.
When using "translations_copypaste", it correctly cuts/copies/pastes.
I have now compiled and run the program in "debug" mode and have noticed an
important difference.
Instead of crashing on Windows 11 when trying to copy/paste, the program prints
an error message and actually exits.
The error message is:
"Error: Error - registered format name must be nonnull"
Does anyone know where this error message is coming from?
I am starting to suspect that Windows clipboard integration routines have
changed since Windows 7 and are not being used correctly internally.
I see there are some functions (which I presume are used internally) that sound
a lot like this error message.
"RegisterClipboardFormat()" and "GetClipboardFormatName()", for instance.
Hopefully this new information can help the experts help me determine why my
program is working on Windows 7 and crashing on Windows 11.
thanks!
From: Stone, Timothy M
Sent: Tuesday, November 7, 2023 12:21 PM
To: cygwin@cygwin.com
Subject: RE: [EXT] Re: XWin copy/paste succeeds on Windows 7, crashes on
Windows 11 Enterprise.
I have created an entire program to test this. It's only 40 lines. The
program pops up a type in window...then you can type something in it and test
the copy/paste.
On Windows 11 enterprise:
When using "translations_ignore", it correctly just prints "Ignoring" every
time I cut/copy/paste.
When using "translations_copypaste", the program crashes.
On Windows 7 professional:
When using "translations_ignore", it correctly just prints "Ignoring" every
time I cut/copy/paste.
When using "translations_copypaste", it correctly cuts/copies/pastes.
Of course, you'll need to link with X/Motif libraries, and possibly change the
one line to point at your XKeysymDB, but this 40 line program shows the whole
problem:
#include <stdio.h>
#include <stdlib.h>
#include <Xm/RowColumn.h>
#include <Xm/TextF.h>
void ignore_cut_paste(Widget widget, XEvent *event, String *args, int *num_args)
{
printf("Ignoring\n");
}
int main(int argc, char **argv)
{
Widget W,thewin,rowcol,textarea;
XtAppContext app_context;
XtActionsRec actions2;
_putenv("display=127.0.0.1:0.0");
_putenv("xkeysymdb=.\\XKeysymDB");
W = XtAppInitialize(&app_context,
(String)"Test",NULL,(Cardinal)0,&argc,argv,NULL,NULL,(Cardinal)0);
actions2.string = "ignore_cut_paste";
actions2.proc = (XtActionProc)ignore_cut_paste;
XtAppAddActions (app_context, &actions2, 1);
String translations_copypaste = "#override\n Ctrl<Key>v: paste-clipboard()\n
Ctrl<Key>c: copy-clipboard()\n Ctrl<Key>x: cut-clipboard()";
String translations_ignore = "#override\n Ctrl<Key>v: ignore_cut_paste()\n
Ctrl<Key>c: ignore_cut_paste()\n Ctrl<Key>x: ignore_cut_paste()";
thewin = XtCreatePopupShell("Test", topLevelShellWidgetClass,W,NULL,0);
rowcol = XtVaCreateWidget ("rowcol",xmRowColumnWidgetClass, thewin, NULL);
textarea = XtVaCreateManagedWidget ("test_area",
xmTextFieldWidgetClass, rowcol,
XmNmaxLength, 80,
XmNtranslations, XtParseTranslationTable
( translations_copypaste ) ,
NULL);
XtManageChild(textarea);
XtManageChild (rowcol);
XtPopup(thewin,XtGrabNone);
XtAppMainLoop(app_context);
}
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