LibVNCServer/LibVNCClient
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 <signal.h>
#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) */
/* Flag used for threaded mode that's global so we can set it via
a signal handler... */
static int maintain_connection = 1;
/* 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 its own pointer */
typedef struct ClientData {
int oldx,oldy;
static void clientgone(rfbClientPtr cl)
{
free(cl->clientData);
cl->clientData = NULL;
}
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);
*/
}
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;
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);
if(!c->richSource)
return;
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;
}
}
}
void intHandler(int dummy) {
maintain_connection = 0;
}
/* Initialization */
int main(int argc,char** argv)
{
rfbScreenInfoPtr rfbScreen = rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
if(!rfbScreen)
return 1;
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) && !defined(LIBVNCSERVER_HAVE_WIN32THREADS)
#error "I need pthreads or win32 threads for that."
#endif
/* catch Ctrl-C to set a flag for the main thread */
signal(SIGINT, intHandler);
/* 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 (maintain_connection) {
sleep(5); /* render(); */
}
fprintf(stderr, "\nShutting down...\n");
rfbShutdownServer(rfbScreen, TRUE);
#endif /* BACKGROUND_LOOP */
free(rfbScreen->frameBuffer);
rfbScreenCleanup(rfbScreen);
return(0);
}
int y
Definition: SDLvncviewer.c:34
int x
Definition: SDLvncviewer.c:34
void intHandler(int dummy)
Definition: example.c:286
int main(int argc, char **argv)
Definition: example.c:292
void rfbInitServer(rfbScreenInfoPtr rfbScreen)
void rfbRunEventLoop(rfbScreenInfoPtr screenInfo, long usec, rfbBool runInBackground)
int rfbDrawCharWithClip(rfbScreenInfoPtr rfbScreen, rfbFontDataPtr font, int x, int y, unsigned char c, int x1, int y1, int x2, int y2, rfbPixel colour, rfbPixel backColour)
if colour==backColour, background is transparent
void rfbCloseClient(rfbClientPtr cl)
void rfbMarkRectAsModified(rfbScreenInfoPtr rfbScreen, int x1, int y1, int x2, int y2)
void rfbShutdownServer(rfbScreenInfoPtr rfbScreen, rfbBool disconnectClients)
void rfbDefaultPtrAddEvent(int buttonMask, int x, int y, rfbClientPtr cl)
cursor handling for the pointer
void rfbScreenCleanup(rfbScreenInfoPtr screenInfo)
rfbScreenInfoPtr rfbGetScreen(int *argc, char **argv, int width, int height, int bitsPerSample, int samplesPerPixel, int bytesPerPixel)
rfbBool rfbIsActive(rfbScreenInfoPtr screenInfo)
rfbBool rfbProcessEvents(rfbScreenInfoPtr screenInfo, long usec)
void rfbDrawString(rfbScreenInfoPtr rfbScreen, rfbFontDataPtr font, int x, int y, const char *string, rfbPixel colour)
void rfbNewFramebuffer(rfbScreenInfoPtr rfbScreen, char *framebuffer, int width, int height, int bitsPerSample, int samplesPerPixel, int bytesPerPixel)
rfbCursorPtr rfbMakeXCursor(int width, int height, char *cursorString, char *maskString)
void rfbFontBBox(rfbFontDataPtr font, unsigned char c, int *x1, int *y1, int *x2, int *y2)
rfbNewClientAction
Definition: rfb.h:91
@ RFB_CLIENT_ACCEPT
Definition: rfb.h:92
#define XK_F11
Definition: keysym.h:259
#define XK_Down
Definition: keysym.h:173
#define XK_F12
Definition: keysym.h:261
#define XK_Escape
Definition: keysym.h:131
#define XK_Up
Definition: keysym.h:171
#define XK_Page_Up
Definition: keysym.h:175
int8_t rfbBool
Definition: rfbproto.h:108
uint32_t rfbKeySym
Definition: rfbproto.h:122
#define TRUE
Definition: rfbproto.h:112
#define FALSE
Definition: rfbproto.h:110
int oldx
Definition: example.c:69
rfbBool oldButton
Definition: example.c:68
int oldy
Definition: example.c:69
#define height
Definition: vncev.c:19
#define width
Definition: vncev.c:18