LibVNCServer/LibVNCClient
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example.c

This is an example of how to use libvncserver.libvncserver example Copyright (C) 2001 Johannes E. Schindelin Johan.nosp@m.nes..nosp@m.Schin.nosp@m.deli.nosp@m.n@gmx.nosp@m..de

This is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this software; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#ifdef WIN32
#define sleep Sleep
#else
#include <unistd.h>
#endif
#ifdef __IRIX__
#include <netdb.h>
#endif
#include <rfb/rfb.h>
#include <rfb/keysym.h>
static const int bpp=4;
static int maxx=800, maxy=600;
/* TODO: odd maxx doesn't work (vncviewer bug) */
/* This initializes a nice (?) background */
static void initBuffer(unsigned char* buffer)
{
int i,j;
for(j=0;j<maxy;++j) {
for(i=0;i<maxx;++i) {
buffer[(j*maxx+i)*bpp+0]=(i+j)*128/(maxx+maxy); /* red */
buffer[(j*maxx+i)*bpp+1]=i*128/maxx; /* green */
buffer[(j*maxx+i)*bpp+2]=j*256/maxy; /* blue */
}
buffer[j*maxx*bpp+0]=0xff;
buffer[j*maxx*bpp+1]=0xff;
buffer[j*maxx*bpp+2]=0xff;
buffer[j*maxx*bpp+3]=0xff;
}
}
/* Here we create a structure so that every client has it's own pointer */
typedef struct ClientData {
int oldx,oldy;
static void clientgone(rfbClientPtr cl)
{
free(cl->clientData);
}
static enum rfbNewClientAction newclient(rfbClientPtr cl)
{
cl->clientData = (void*)calloc(sizeof(ClientData),1);
cl->clientGoneHook = clientgone;
}
/* switch to new framebuffer contents */
static void newframebuffer(rfbScreenInfoPtr screen, int width, int height)
{
unsigned char *oldfb, *newfb;
maxx = width;
maxy = height;
oldfb = (unsigned char*)screen->frameBuffer;
newfb = (unsigned char*)malloc(maxx * maxy * bpp);
initBuffer(newfb);
rfbNewFramebuffer(screen, (char*)newfb, maxx, maxy, 8, 3, bpp);
free(oldfb);
/*** FIXME: Re-install cursor. ***/
}
/* aux function to draw a line */
static void drawline(unsigned char* buffer,int rowstride,int bpp,int x1,int y1,int x2,int y2)
{
int i,j;
i=x1-x2; j=y1-y2;
if(i==0 && j==0) {
for(i=0;i<bpp;i++)
buffer[y1*rowstride+x1*bpp+i]=0xff;
return;
}
if(i<0) i=-i;
if(j<0) j=-j;
if(i<j) {
if(y1>y2) { i=y2; y2=y1; y1=i; i=x2; x2=x1; x1=i; }
for(j=y1;j<=y2;j++)
for(i=0;i<bpp;i++)
buffer[j*rowstride+(x1+(j-y1)*(x2-x1)/(y2-y1))*bpp+i]=0xff;
} else {
if(x1>x2) { i=y2; y2=y1; y1=i; i=x2; x2=x1; x1=i; }
for(i=x1;i<=x2;i++)
for(j=0;j<bpp;j++)
buffer[(y1+(i-x1)*(y2-y1)/(x2-x1))*rowstride+i*bpp+j]=0xff;
}
}
/* Here the pointer events are handled */
static void doptr(int buttonMask,int x,int y,rfbClientPtr cl)
{
ClientData* cd=cl->clientData;
if(x>=0 && y>=0 && x<maxx && y<maxy) {
if(buttonMask) {
int i,j,x1,x2,y1,y2;
if(cd->oldButton==buttonMask) { /* draw a line */
drawline((unsigned char*)cl->screen->frameBuffer,cl->screen->paddedWidthInBytes,bpp,
x,y,cd->oldx,cd->oldy);
x1=x; y1=y;
if(x1>cd->oldx) x1++; else cd->oldx++;
if(y1>cd->oldy) y1++; else cd->oldy++;
rfbMarkRectAsModified(cl->screen,x,y,cd->oldx,cd->oldy);
} else { /* draw a point (diameter depends on button) */
int w=cl->screen->paddedWidthInBytes;
x1=x-buttonMask; if(x1<0) x1=0;
x2=x+buttonMask; if(x2>maxx) x2=maxx;
y1=y-buttonMask; if(y1<0) y1=0;
y2=y+buttonMask; if(y2>maxy) y2=maxy;
for(i=x1*bpp;i<x2*bpp;i++)
for(j=y1;j<y2;j++)
cl->screen->frameBuffer[j*w+i]=(char)0xff;
rfbMarkRectAsModified(cl->screen,x1,y1,x2,y2);
}
/* we could get a selection like that:
rfbGotXCutText(cl->screen,"Hallo",5);
*/
} else
cd->oldButton=0;
cd->oldx=x; cd->oldy=y; cd->oldButton=buttonMask;
}
rfbDefaultPtrAddEvent(buttonMask,x,y,cl);
}
/* aux function to draw a character to x, y */
#include "radon.h"
/* Here the key events are handled */
static void dokey(rfbBool down,rfbKeySym key,rfbClientPtr cl)
{
if(down) {
if(key==XK_Escape)
else if(key==XK_F12)
/* close down server, disconnecting clients */
rfbShutdownServer(cl->screen,TRUE);
else if(key==XK_F11)
/* close down server, but wait for all clients to disconnect */
rfbShutdownServer(cl->screen,FALSE);
else if(key==XK_Page_Up) {
initBuffer((unsigned char*)cl->screen->frameBuffer);
rfbMarkRectAsModified(cl->screen,0,0,maxx,maxy);
} else if (key == XK_Up) {
if (maxx < 1024) {
if (maxx < 800) {
newframebuffer(cl->screen, 800, 600);
} else {
newframebuffer(cl->screen, 1024, 768);
}
}
} else if(key==XK_Down) {
if (maxx > 640) {
if (maxx > 800) {
newframebuffer(cl->screen, 800, 600);
} else {
newframebuffer(cl->screen, 640, 480);
}
}
} else if(key>=' ' && key<0x100) {
ClientData* cd=cl->clientData;
int x1=cd->oldx,y1=cd->oldy,x2,y2;
cd->oldx+=rfbDrawCharWithClip(cl->screen,&radonFont,cd->oldx,cd->oldy,(char)key,0,0,cl->screen->width,cl->screen->height,0x00ffffff,0x00ffffff);
rfbFontBBox(&radonFont,(char)key,&x1,&y1,&x2,&y2);
rfbMarkRectAsModified(cl->screen,x1,y1,x2-1,y2-1);
}
}
}
/* Example for an XCursor (foreground/background only) */
#ifdef JUST_AN_EXAMPLE
static int exampleXCursorWidth=9,exampleXCursorHeight=7;
static char exampleXCursor[]=
" "
" xx xx "
" xx xx "
" xxx "
" xx xx "
" xx xx "
" ";
#endif
/* Example for a rich cursor (full-colour) */
static void MakeRichCursor(rfbScreenInfoPtr rfbScreen)
{
int i,j,w=32,h=32;
rfbCursorPtr c = rfbScreen->cursor;
char bitmap[]=
" "
" xxxxxx "
" xxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxx "
" xxxxx xxxxxxxx xxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxx xxxxxxxxxxx xxxxxxx "
" xxxx xxxxxxxxx xxxxxx "
" xxxxx xxxxxxxxxxx xxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxx xxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxx xxxxxxxxxxxxxx "
" xxxxxxxxxx xxxxxxxxxxxx "
" xxxxxxxxx xxxxxxxxx "
" xxxxxxxxxx xxxxxxxxx "
" xxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxx "
" xxxx xxxxxxxxxxxxx "
" xx x xxxxxxxxxxx "
" xxx xxxxxxxxxxx "
" xxxx xxxxxxxxxxx "
" xxxxxx xxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxx "
" ";
c=rfbScreen->cursor = rfbMakeXCursor(w,h,bitmap,bitmap);
c->xhot = 16; c->yhot = 24;
c->richSource = (unsigned char*)malloc(w*h*bpp);
c->cleanupRichSource = TRUE;
for(j=0;j<h;j++) {
for(i=0;i<w;i++) {
c->richSource[j*w*bpp+i*bpp+0]=i*0xff/w;
c->richSource[j*w*bpp+i*bpp+1]=(i+j)*0xff/(w+h);
c->richSource[j*w*bpp+i*bpp+2]=j*0xff/h;
c->richSource[j*w*bpp+i*bpp+3]=0;
}
}
}
/* Initialization */
int main(int argc,char** argv)
{
rfbScreenInfoPtr rfbScreen = rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
if(!rfbScreen)
return 0;
rfbScreen->desktopName = "LibVNCServer Example";
rfbScreen->frameBuffer = (char*)malloc(maxx*maxy*bpp);
rfbScreen->alwaysShared = TRUE;
rfbScreen->ptrAddEvent = doptr;
rfbScreen->kbdAddEvent = dokey;
rfbScreen->newClientHook = newclient;
rfbScreen->httpDir = "../webclients";
rfbScreen->httpEnableProxyConnect = TRUE;
initBuffer((unsigned char*)rfbScreen->frameBuffer);
rfbDrawString(rfbScreen,&radonFont,20,100,"Hello, World!",0xffffff);
/* This call creates a mask and then a cursor: */
/* rfbScreen->defaultCursor =
rfbMakeXCursor(exampleCursorWidth,exampleCursorHeight,exampleCursor,0);
*/
MakeRichCursor(rfbScreen);
/* initialize the server */
rfbInitServer(rfbScreen);
#ifndef BACKGROUND_LOOP_TEST
#ifdef USE_OWN_LOOP
{
int i;
for(i=0;rfbIsActive(rfbScreen);i++) {
fprintf(stderr,"%d\r",i);
rfbProcessEvents(rfbScreen,100000);
}
}
#else
/* this is the blocking event loop, i.e. it never returns */
/* 40000 are the microseconds to wait on select(), i.e. 0.04 seconds */
rfbRunEventLoop(rfbScreen,40000,FALSE);
#endif /* OWN LOOP */
#else
#if !defined(LIBVNCSERVER_HAVE_LIBPTHREAD)
#error "I need pthreads for that."
#endif
/* this is the non-blocking event loop; a background thread is started */
rfbRunEventLoop(rfbScreen,-1,TRUE);
fprintf(stderr, "Running background loop...\n");
/* now we could do some cool things like rendering in idle time */
while(1) sleep(5); /* render(); */
#endif /* BACKGROUND_LOOP */
free(rfbScreen->frameBuffer);
rfbScreenCleanup(rfbScreen);
return(0);
}