Hello, I am attempting to compile a simple C++ program that produces an
Xlib window. Here is the program which is from a tutorial:
Code:
#include <X11/Xlib.h> // Every Xlib program must include this
#include <assert.h> // I include this to test return values the lazy way
#include <unistd.h> // So we got the profile for 10 seconds
#define NIL (0) // A name for the void pointer
main()
{
// Open the display
Display *dpy = XOpenDisplay(NIL);
assert(dpy);
// Get some colors
int blackColor = BlackPixel(dpy, DefaultScreen(dpy));
int whiteColor = WhitePixel(dpy, DefaultScreen(dpy));
// Create the window
Window w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0,
200, 100, 0, blackColor, blackColor);
// We want to get MapNotify events
XSelectInput(dpy, w, StructureNotifyMask);
// "Map" the window (that is, make it appear on the screen)
XMapWindow(dpy, w);
// Create a "Graphics Context"
GC gc = XCreateGC(dpy, w, 0, NIL);
// Tell the GC we draw using the white color
XSetForeground(dpy, gc, whiteColor);
// Wait for the MapNotify event
for(;;) {
XEvent e;
XNextEvent(dpy, &e);
if (e.type == MapNotify)
break;
}
// Draw the line
XDrawLine(dpy, w, gc, 10, 60, 180, 20);
// Send the "DrawLine" request to the server
XFlush(dpy);
// Wait for 10 seconds
sleep(10);
}
When I invoke the compilation commands, I get the following errors:
Code:
wind.cpp:1:21: error: X11/Xlib.h: No such file or directory
wind.cpp: In function 'int main()':
wind.cpp:8: error: 'Display' was not declared in this scope
wind.cpp:8: error: 'dpy' was not declared in this scope
wind.cpp:8: error: 'XOpenDisplay' was not declared in this scope
wind.cpp:11: error: 'DefaultScreen' was not declared in this scope
wind.cpp:11: error: 'BlackPixel' was not declared in this scope
wind.cpp:12: error: 'WhitePixel' was not declared in this scope
wind.cpp:15: error: 'Window' was not declared in this scope
wind.cpp:15: error: expected `;' before 'w'
wind.cpp:18: error: 'w' was not declared in this scope
wind.cpp:18: error: 'StructureNotifyMask' was not declared in this scope
wind.cpp:18: error: 'XSelectInput' was not declared in this scope
wind.cpp:21: error: 'XMapWindow' was not declared in this scope
wind.cpp:24: error: 'GC' was not declared in this scope
wind.cpp:24: error: expected `;' before 'gc'
wind.cpp:25: error: 'gc' was not declared in this scope
wind.cpp:25: error: 'XSetForeground' was not declared in this scope
wind.cpp:29: error: 'XEvent' was not declared in this scope
wind.cpp:29: error: expected `;' before 'e'
wind.cpp:30: error: 'e' was not declared in this scope
wind.cpp:30: error: 'XNextEvent' was not declared in this scope
wind.cpp:31: error: 'MapNotify' was not declared in this scope
wind.cpp:35: error: 'XDrawLine' was not declared in this scope
wind.cpp:36: error: 'XFlush' was not declared in this scope
I have checked to ensure that
libX11 is installed (it is) but cannot figure out why the compiler and linker cannot see the library and headers, even when explicitly linked.
Any ideas would be most welcome.
August 7th, 2012, 22:49
Problem compiling an Xlib program.
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