replace input for password entry. [Last modified: April 93] Answer: In Motif 1.1 Use the modifyVerifyCallback to tell when input is received. Set text->ptr in the callback structure to '*'. This does not work under 1.0 because of an oversight in which changes to this are ignored. In Motif 1.0, what you can do is set the doit flag to 'false' so the text is not displayed. Then set a static boolean to True to prevent re-entrance. Next call XmTextReplace() to display your '*'. then reset your re-entrance flag to False. XmTextReplace() will call the XmNmodifyVerify callback. To prevent getting into an infinite loop, you need the re-entrance flag. The following program from Dan Heller illustrates this: -------------- /* Written by Dan Heller. Copyright 1991, O'Reilly && Associates. * This program is freely distributable without licensing fees and * is provided without guarantee or warranty expressed or implied. * This program is -not- in the public domain. This program appears * in the Motif Programming Manual, O'Reilly Volume 6. */ /* passwd.c -- prompt for a passwd. Meaning, all input looks like * a series of *'s. Store the actual data typed by the user in * an internal variable. Don't allow paste operations. Handle * backspacing by deleting all text from insertion point to the * end of text. */ #include <Xm/Text.h> #include <Xm/LabelG.h> #include <Xm/RowColumn.h> #include <ctype.h> void check_passwd(); char *passwd; /* store user-typed passwd here. */ main(argc, argv) int argc; char *argv[]; { Widget toplevel, text_w, rowcol; XtAppContext app; toplevel = XtVaAppInitialize(&app, "Demos", NULL, 0, &argc, argv, NULL, NULL); rowcol = XtVaCreateWidget("rowcol", xmRowColumnWidgetClass, toplevel, XmNorientation, XmHORIZONTAL, NULL); XtVaCreateManagedWidget("Password:", xmLabelGadgetClass, rowcol, NULL); text_w = XtVaCreateManagedWidget("text_w", xmTextWidgetClass, rowcol, NULL); XtAddCallback(text_w, XmNmodifyVerifyCallback, check_passwd, NULL); XtAddCallback(text_w, XmNactivateCallback, check_passwd, NULL); XtManageChild(rowcol); XtRealizeWidget(toplevel); XtAppMainLoop(app); } void check_passwd(text_w, unused, cbs) Widget text_w; XtPointer unused; XmTextVerifyCallbackStruct *cbs; { char *new; int len; if (cbs->reason == XmCR_ACTIVATE) { printf("Password: %s\n", passwd); return; } if (cbs->text->ptr == NULL) { /* backspace */ cbs->endPos = strlen(passwd); /* delete from here to end */ if (cbs->endPos <= 0) return; /* catch null passwd - Mark Scoville */ passwd[cbs->startPos] = 0; /* backspace--terminate */ return; } if (cbs->text->length > 1) { cbs->doit = False; /* don't allow "paste" operations */ return; /* make the user *type* the password! */ } new = XtMalloc(cbs->endPos + 2); /* new char + NULL terminator */ if (passwd) { strcpy(new, passwd); XtFree(passwd); } else new[0] = NULL; passwd = new; strncat(passwd, cbs->text->ptr, cbs->text->length); passwd[cbs->endPos + cbs->text->length] = 0; for (len = 0; len < cbs->text->length; len++) cbs->text->ptr[len] = '*'; }Go Back Up