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Full Discussion: Wanna learn native GUI programming in UNIX - Linux ?
Top Forums UNIX for Beginners Questions & Answers Wanna learn native GUI programming in UNIX - Linux ? Post 303040558 by Sennenmut on Thursday 31st of October 2019 01:46:10 PM
Old 10-31-2019
GUI Programming. Code works.
Hi ,
wanna learn native GUI programming in Unix-Linux instead of Gtk and Qt.
No problem. You don't need a cross platform Gui toolkit like Gtk and Qt.
And the code and syntax is also not more or less than others.
Check out this code for a simple mainwindow for your application that is openend in the middle of the screen.
Save code as mainwin.c file.
Go in the folder with terminal and compile with the command :
Code:
clang -o newone  mainwin.c  -lXm -lXt -lX11

When it is ready then write in the same folder terminal :
Code:
chmod 777 newone

Start the executable file from normal file browser with a double klick.
You see a main window GUI in the middle of your screen.
Thats it.
All works propertly. Since 30 Years. Only cross compile applications need a different toolkit.
Change the size of the window simple by other dimension data.
Of course you should have installed 'clang' compiler and 'motif' toolkit with your
synaptic package manager programm that is on your UNIX machine.

Code:
 #include <Xm/Form.h>
#include <Xm/Label.h>
#include <Xm/PushB.h>


int main ( int argc, char ** argv )
{
    Widget              shell, form, label, button;
    XtAppContext app;
    int  i;


    shell = XtAppInitialize ( &app, "Formtest", NULL, 0,
                          &argc, argv, NULL, NULL, 0 );

    Screen * s = XtScreen(shell);

    int dw = WidthOfScreen(s);
    int dh = HeightOfScreen( s );

    Dimension px = (dw-500)/2;
    Dimension py = (dh-300)/2;

    XtVaSetValues ( shell,
              XmNwidth, 500,
              XmNheight, 300,
              XmNx, px,
              XmNy, py,
              NULL );


    form = XtCreateManagedWidget ( "form", xmFormWidgetClass,
                                shell, NULL, 0 );

    label = XtVaCreateManagedWidget ( "label", xmLabelWidgetClass,
                                form, NULL, 0 );

    button = XtVaCreateManagedWidget ( "button", xmPushButtonWidgetClass,
                                form,
                                XmNbottomAttachment,       XmATTACH_FORM,
                                 0 );
    XtVaSetValues ( button,
              XmNwidth, 100,
              XmNheight, 50,
              NULL );


    XtRealizeWidget ( shell );
    XtAppMainLoop ( app );

}

Last edited by Sennenmut; 10-31-2019 at 03:44 PM.. Reason: more description
 

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LEARN ABOUT HPUX

xtvaappinitialize

XtVaAppInitialize()													       XtVaAppInitialize()

Name
  XtVaAppInitialize - initialize the X Toolkit internals, using varargs argument style.

Synopsis
  Widget  XtVaAppInitialize(app_context_return,  application_class,  options, num_options, argc_in_out, argv_in_out, fallback_resources, ...,
  NULL)
	 XtAppContext *app_context_return;
	 String application_class;
	 XrmOptionDescList options;
	 Cardinal num_options;
	 int *argc_in_out;     /* was type Cardinal * in Release 4 */
	 String *argv_in_out;
	 String *fallback_resources;

Inputs
  application_class
		 Specifies the class name of the application.

  options	 Specifies the command line options table.

  num_options	 Specifies the number of entries in options.

  argc_in_out	 Specifies a pointer to the number of command line arguments.  This argument was a Cardinal * in Release 4, and is an  int  *
		 in Release 5.

  argv_in_out	 Specifies the command line arguments array.

  fallback_resources
		 Specifies resource values to be used if the application class resource file cannot be opened, or NULL.

  ..., NULL	 A  NULL-terminated  variable-length  list of resource name/value pairs to override any other resource specifications for the
		 created shell.

Outputs
  app_context_return
		 Returns the application context, if non-NULL.

Returns
  A toplevel shell widget of class applicationShellWidgetClass.

Availability
  Release 4 and later.

Description
  XtVaAppInitialize() initializes the Toolkit internals, creates an application context, opens and initializes a  display,  and  creates  the
  initial  application	shell.	It is identical to XtAppInitialize() except that the args array of resource names and values and the num_args
  argument of that function are replaced with a NULL-terminated variable-length argument list.

  See XtAppInitialize() for more information on this function.	See XtVaSetValues() for more information on  using  variable-length  argument
  lists to specify resources.

See Also
  XtAppInitialize(1), XtVaSetValues(1).

Xt - Initialization													       XtVaAppInitialize()
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