1 /* A simple example of an RFB client */
7 #include <rfb/rfbclient.h>
9 static void HandleRect(rfbClient* client, int x, int y, int w, int h) {
13 * The client part of the back channel extension example.
17 #define rfbBackChannel 155
19 typedef struct backChannelMsg {
26 static void sendMessage(rfbClient* client, char* text)
29 uint32_t length = strlen(text)+1;
31 msg.type = rfbBackChannel;
32 msg.size = rfbClientSwap32IfLE(length);
33 if(!WriteToRFBServer(client, (char*)&msg, sizeof(msg)) ||
34 !WriteToRFBServer(client, text, length)) {
35 rfbClientLog("enableBackChannel: write error (%d: %s)", errno, strerror(errno));
39 static rfbBool handleBackChannelMessage(rfbClient* client,
40 rfbServerToClientMsg* message)
45 if(message->type != rfbBackChannel)
48 rfbClientSetClientData(client, sendMessage, sendMessage);
50 if(!ReadFromRFBServer(client, ((char*)&msg)+1, sizeof(msg)-1))
52 msg.size = rfbClientSwap32IfLE(msg.size);
53 text = malloc(msg.size);
54 if(!ReadFromRFBServer(client, text, msg.size)) {
59 rfbClientLog("got back channel message: %s\n", text);
65 static int backChannelEncodings[] = { rfbBackChannel, 0 };
67 static rfbClientProtocolExtension backChannel = {
68 backChannelEncodings, /* encodings */
69 NULL, /* handleEncoding */
70 handleBackChannelMessage, /* handleMessage */
71 NULL /* next extension */
75 main(int argc, char **argv)
77 rfbClient* client = rfbGetClient(8,3,4);
79 client->GotFrameBufferUpdate = HandleRect;
80 rfbClientRegisterExtension(&backChannel);
82 if (!rfbInitClient(client,&argc,argv))
86 /* After each idle second, send a message */
87 if(WaitForMessage(client,1000000)>0)
88 HandleRFBServerMessage(client);
89 else if(rfbClientGetClientData(client, sendMessage))
90 sendMessage(client, "Dear Server,\n"
91 "thank you for understanding "
92 "back channel messages!");
95 rfbClientCleanup(client);