GrabMouse in Xlib
需考虑鼠标拖动窗口、屏幕缩放等事件。
在Xlib程序中，所有的事情都是被事件驱动的。
流程：
while(1) {
XNextEvent(display,&an_event);
switch (an_event.type){
caseExpose:
/* handle this event type...*/
.
.
break;
default: /* unknown event type - ignoreit. */
break;
}
}
参：
http://ffmpeg.org/doxygen/trunk/x11grab_8c.html#a48e04508b36fdecda802d671a25a0e47
http://stackoverflow.com/questions/14561267/how-to-read-mouse-click-event-from-x-server
//cursor.c
/* ref: http://www.ishiboo.com/~danny/Projects/xwarppointer/ */
#include <stdio.h>
#include <string.h>
//头文件
#include <unistd.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
//全局变量
Display *display;
Window root;
//初始化
void init()
{
if ((display = XOpenDisplay(NULL)) == NULL) {
fprintf(stderr, "Cannot open local X-display.\n");
return;
}
root = DefaultRootWindow(display);
}
//得到坐标
void GetCursorPos(int *x,int *y)
{
int tmp;unsigned int tmp2;
Window fromroot, tmpwin;
XQueryPointer(display, root, &fromroot, &tmpwin, x, y, &tmp, &tmp, &tmp2);
}
//设置坐标
void SetCursorPos(int x,int y)
{
int tmp;
XWarpPointer(display, None, root, 0, 0, 0, 0, x, y);
XFlush(display);
}
//模拟点击
/* http://www.linuxquestions.org/questions/programming-9/simulating-a-mouse-click-594576/ */
void mouseClick(int button)
{
Display *display = XOpenDisplay(NULL);
XEvent event;
if(display == NULL)
{
printf("Errore nell'apertura del Display !!!\n");
return;
}
memset(&event, 0x00, sizeof(event));
event.type = ButtonPress;
event.xbutton.button = button;
event.xbutton.same_screen = True;
XQueryPointer(display, RootWindow(display, DefaultScreen(display)), &event.xbutton.root, &event.xbutton.window, &event.xbutton.x_root, &event.xbutton.y_root, &event.xbutton.x, &event.xbutton.y, &event.xbutton.state);
event.xbutton.subwindow = event.xbutton.window;
while(event.xbutton.subwindow)
{
event.xbutton.window = event.xbutton.subwindow;
XQueryPointer(display, event.xbutton.window, &event.xbutton.root, &event.xbutton.subwindow, &event.xbutton.x_root, &event.xbutton.y_root, &event.xbutton.x, &event.xbutton.y, &event.xbutton.state);
}
if(XSendEvent(display, PointerWindow, True, 0xfff, &event) == 0) printf("Errore nell'invio dell'evento !!!\n");
XFlush(display);
usleep(100000);
event.type = ButtonRelease;
event.xbutton.state = 0x100;
if(XSendEvent(display, PointerWindow, True, 0xfff, &event) == 0) printf("Errore nell'invio dell'evento !!!\n");
XFlush(display);
XCloseDisplay(display);
}
int main()
{
init();
int x=-1,y=-1;
GetCursorPos(&x,&y);
printf("%d %d\n",x,y);
SetCursorPos(0,0);
XCloseDisplay(display);
mouseClick(Button1);
return 0;
}
//grabmouse.cpp
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>
int main(){
Display* display;
int screen_num;
Screen *screen;
Window root_win;
XEvent report;
XButtonEvent *xb = (XButtonEvent *)&report;
int i;
Cursor cursor;
display = XOpenDisplay(0);
if (display == NULL){
perror("Cannot connect to X server");
exit (-1);
}
screen_num = DefaultScreen(display);
screen = XScreenOfDisplay(display, screen_num);
root_win = RootWindow(display, XScreenNumberOfScreen(screen));
//cursor = XCreateFontCursor(display, XC_crosshair);
cursor = XCreateFontCursor(display, XC_left_ptr);
i = XGrabPointer(display, root_win, False,
ButtonReleaseMask | ButtonPressMask|Button1MotionMask, GrabModeSync,
GrabModeAsync, root_win, cursor, CurrentTime);
if(i != GrabSuccess){
perror("Can't grab the mouse");
exit(-1);
}
//XSelectInput(display,DefaultRootWindow(display), ExposureMask | ButtonPressMask);
for(i = 0; i < 10; i++){
XAllowEvents(display, SyncPointer, CurrentTime);
XWindowEvent(display, root_win, ButtonPressMask | ButtonReleaseMask, &report);
//XNextEvent(display,&report);
switch(report.type){
case ButtonPress:
printf("Press @ (%d, %d)\n", xb->x_root, xb->y_root);
//printf("Press @ (%d, %d)\n",report.xbutton.x, report.xbutton.y);
break;
case ButtonRelease:
printf("Release @ (%d, %d)\n", xb->x_root, xb->y_root);
//printf("Release @ (%d, %d)\n", report.xbutton.x, report.xbutton.y);
break;
}
}
XFlush(display);
XUngrabServer(display);
XCloseDisplay( display );
return 0;
}
//xcursor.c
/**
*gcc -lX11 -lXext xcursorBusy.c -o xcursorBusy
*xcursorBusy
*xcursorBusy resort 2>logfile
*/
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/cursorfont.h>
#include <stdio.h>
#include <stdlib.h>
static const unsigned char xlib_spinning_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
0x0c, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x00,
0x7c, 0x00, 0x00, 0x00, 0xfc, 0x00, 0x00, 0x00, 0xfc, 0x01, 0x00, 0x00,
0xfc, 0x3b, 0x00, 0x00, 0x7c, 0x38, 0x00, 0x00, 0x6c, 0x54, 0x00, 0x00,
0xc4, 0xdc, 0x00, 0x00, 0xc0, 0x44, 0x00, 0x00, 0x80, 0x39, 0x00, 0x00,
0x80, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const unsigned char xlib_spinning_mask_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00,
0x1e, 0x00, 0x00, 0x00, 0x3e, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00,
0xfe, 0x00, 0x00, 0x00, 0xfe, 0x01, 0x00, 0x00, 0xfe, 0x3b, 0x00, 0x00,
0xfe, 0x7f, 0x00, 0x00, 0xfe, 0x7f, 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00,
0xee, 0xff, 0x01, 0x00, 0xe4, 0xff, 0x00, 0x00, 0xc0, 0x7f, 0x00, 0x00,
0xc0, 0x7f, 0x00, 0x00, 0x80, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
Cursor
cursorCreateSpinning (Display * dpy)
{
Pixmap cursor;
Pixmap mask;
XColor fg, bg;
Cursor xcursor;
fg.pixel = 0;
fg.red = 0;
fg.green = 0;
fg.blue = 0;
fg.flags = 0xf;
bg.pixel = 0xffffffff;
bg.red = 0xffff;
bg.green = 0xffff;
bg.blue = 0xffff;
bg.flags = 0xf;
cursor = XCreatePixmapFromBitmapData (dpy, DefaultRootWindow(dpy),
(char *) xlib_spinning_bits,
32, 32, 0xffffffff, 0x0, 1);
mask = XCreatePixmapFromBitmapData (dpy, DefaultRootWindow(dpy),
(char *) xlib_spinning_mask_bits,
32, 32, 0xffffffff, 0x0, 1);
xcursor = XCreatePixmapCursor (dpy, cursor, mask, &fg, &bg, 2, 2);
XFreePixmap (dpy, mask);
XFreePixmap (dpy, cursor);
return xcursor;
}
int
main(int argc, char **argv)
{
Display *d;
Window w;
Cursor busy_ptr;
char *dn = getenv ("DISPLAY");
fprintf (stderr, "got display %s\n", dn);
d = XOpenDisplay( dn );
if (d == NULL) {
fprintf (stderr, "%s display open error!", dn);
} else {
fprintf (stderr, "display open normal\n");
}
w = RootWindow (d, DefaultScreen (d));
fprintf (stderr, "%s get root window %d\n", dn, DefaultScreen (d));
#if 1
// busy cursor/normal cursor
if (argc > 1) {
// resort default cursor by WM
// busy_ptr = 0; or
// XUndefineCursor (d, w); goto cursor_out;
busy_ptr = XCreateFontCursor (d, XC_left_ptr); // or X_Cursor
fprintf (stderr, "resort default cursor\n");
} else {
busy_ptr = cursorCreateSpinning (d);
fprintf (stderr, "create busy cursor\n");
}
XDefineCursor(d, w, busy_ptr);
XFreeCursor(d, busy_ptr);
#else
// transparent cursor
Pixmap bm_no;
Colormap cmap;
Cursor no_ptr;
XColor black, dummy;
static char bm_no_data[] = {0, 0, 0, 0, 0, 0, 0, 0};
cmap = DefaultColormap(d, DefaultScreen(d));
XAllocNamedColor(d, cmap, "black", &black, &dummy);
bm_no = XCreateBitmapFromData(d, w, bm_no_data, 8, 8);
no_ptr = XCreatePixmapCursor(d, bm_no, bm_no, &black, &black, 0, 0);
XDefineCursor(d, w, no_ptr);
XFreeCursor(d, no_ptr);
if (bm_no != None)
XFreePixmap(d, bm_no);
XFreeColors(d, cmap, &black.pixel, 1, 0);
#endif
XMapWindow( d, w );
XSync(d, False);
//XFlush( d );
fprintf (stderr, "let cursor loop\n");
#if 0
while( 1 ){
XEvent xe;
XNextEvent(d, &xe);
switch (xe.type) {
case KeyPress:
case ButtonPress:
fprintf (stderr, "cursor exit\n");
goto cursor_out;
default:
fprintf (stderr, "catch event %i\n", xe.type);
}
}
#endif
cursor_out:
fprintf (stderr, "release resource\n");
XDestroyWindow(d, w);
XCloseDisplay(d);
return 0;
}