The first example which we will discuss is sealevel.c. This sample program starts the Data Explorer user interface in -image mode, and then loads a visual program (see Figure 12).
#include <stdio.h>
#include "dx/dxl.h"
#ifndef BASE
#define BASE "/usr/local/dx"
#endif
/*
* define an error handler
*/
void ErrorHandler(DXLConnection *conn, const char *msg, void *data)
{
printf("DXL Error: %s\n", msg);
}
main(int argc, char *argv[])
{
DXLConnection *conn = NULL;
char result[100];
/*
* Start Data Explorer in -image mode with certain menus disabled.
*/
conn = DXLStartDX(
"dx -image -noExitOptions -noExecuteMenus -noConnectionMenus",
NULL);
if (conn == NULL)
{
fprintf(stderr,"Could not connect\n");
perror("DXLStartDX");
exit(1);
}
/*
* Set the error handler
*/
DXLSetErrorHandler(conn, ErrorHandler, NULL);
/*
* Load the visual program to run
*/
DXLLoadVisualProgram(conn, BASE"/samples/dxlink/sealevel.net");
/*
* Set the value of the DXLInput tool which is labelled
* "contour_line_value" and execute.
*/
DXLSetValue(conn, "contour_line_value", "0");
DXLExecuteOnce(conn);
/*
* Set the value of the DXLInput tool which is labelled
* "contour_line_value" and execute.
*/
DXLSetValue(conn, "contour_line_value", "2");
DXLExecuteOnce(conn);
/*
* Set the value of the DXLInput tool which is labelled
* "contour_line_value" and execute.
*/
DXLSetValue(conn, "contour_line_value", "5");
DXLExecuteOnce(conn);
/*
* Set the value of the DXLInput tool which is labelled
* "contour_line_value" and execute.
*/
DXLSetValue(conn, "contour_line_value", "20");
DXLExecuteOnce(conn);
/*
* Set the value of the DXLInput tool which is labelled
* "contour_line_value" and execute.
*/
DXLSetValue(conn, "contour_line_value", "50");
DXLExecuteOnce(conn);
printf("An image window will appear\n");
printf("and a sequence of images will be created.\n");
printf("When you are finished, hit return to quit:");
gets(result);
DXLExitDX(conn);
}