Fix up sync version to new protocol

src/connection.h

@@ -4,16 +4,24 @@
 
 #include <stdint.h>
 
+enum class OPCODE : uint32_t {
+    HANDSHAKE = 0,
+    FRAME = 1,
+    CLOSE = 2,
+};
+
 struct RpcMessageFrame {
+    OPCODE opcode;
     uint32_t length;
-    char message[64 * 1024 - sizeof(uint32_t)];
+    char message[64 * 1024 - 8];
 };
 
 struct RpcConnection {
     void (*onConnect)() = nullptr;
     void (*onDisconnect)() = nullptr;
+    char appId[64];
 
-    static RpcConnection* Create();
+    static RpcConnection* Create(const char* applicationId);
     static void Destroy(RpcConnection*&);
     void Open();
     void Close();

src/connection_win_sync.cpp

@@ -8,16 +8,22 @@
 #define NOIME
 #include <windows.h>
 
+#include "yolojson.h"
+
+const int RpcVersion = 1;
+
 struct WinRpcConnection : public RpcConnection {
     HANDLE pipe{INVALID_HANDLE_VALUE};
     RpcMessageFrame frame;
 };
 
-static const wchar_t* PipeName = L"\\\\.\\pipe\\DiscordRpcServer";
+static const wchar_t* PipeName = L"\\\\?\\pipe\\discord-ipc";
 
-/*static*/ RpcConnection* RpcConnection::Create()
+/*static*/ RpcConnection* RpcConnection::Create(const char* applicationId)
 {
-    return new WinRpcConnection;
+    auto connection = new WinRpcConnection;
+    StringCopy(connection->appId, applicationId, sizeof(connection->appId));
+    return connection;
 }
 
 /*static*/ void RpcConnection::Destroy(RpcConnection*& c)
@@ -49,6 +55,13 @@ void RpcConnection::Open()
             return;
         }
     }
+
+    RpcMessageFrame* frame = GetNextFrame();
+    frame->opcode = OPCODE::HANDSHAKE;
+    char* msg = frame->message;
+    JsonWriteHandshakeObj(msg, RpcVersion, appId);
+    frame->length = msg - frame->message;
+    WriteFrame(frame);
 }
 
 void RpcConnection::Close()
@@ -86,5 +99,5 @@ RpcMessageFrame* RpcConnection::GetNextFrame()
 void RpcConnection::WriteFrame(RpcMessageFrame* frame)
 {
     auto self = reinterpret_cast<WinRpcConnection*>(this);
-    self->Write(frame, frame->length);
+    self->Write(frame, 8 + frame->length);
 }

src/discord-rpc.cpp

@@ -11,7 +11,6 @@ static bool wasJustDisconnected = false;
 
 extern "C" void Discord_Initialize(const char* applicationId, DiscordEventHandlers* handlers)
 {
-    StringCopy(ApplicationId, applicationId, sizeof(ApplicationId));
     if (handlers) {
         Handlers = *handlers;
     }
@@ -19,7 +18,7 @@ extern "C" void Discord_Initialize(const char* applicationId, DiscordEventHandle
         Handlers = {};
     }
 
-    MyConnection = RpcConnection::Create();
+    MyConnection = RpcConnection::Create(applicationId);
     MyConnection->onConnect = []() { wasJustConnected = true; };
     MyConnection->onDisconnect = []() { wasJustDisconnected = true; };
     MyConnection->Open();
@@ -37,7 +36,7 @@ extern "C" void Discord_UpdatePresence(const DiscordRichPresence* presence)
     auto frame = MyConnection->GetNextFrame();
     char* jsonWrite = frame->message;
     JsonWriteRichPresenceObj(jsonWrite, presence);
-    frame->length = sizeof(uint32_t) + (jsonWrite - frame->message);
+    frame->length = jsonWrite - frame->message;
     MyConnection->WriteFrame(frame);
 }
 

src/yolojson.h

@@ -1,5 +1,8 @@
 #pragma once
 
+#include "connection.h"
+#include "discord-rpc.h"
+
 /*
     This is as simple of a json writing thing as possible; does not try to keep you
     from overflowing buffer, so make sure you have room.
@@ -188,3 +191,16 @@ inline void JsonWriteRichPresenceObj(char*& dest, const DiscordRichPresence* pre
     dest -= 1;
     *(dest - 1) = '}';
 }
+
+inline void JsonWriteHandshakeObj(char*& dest, int version, const char* applicationId)
+{
+    *dest++ = '{';
+
+    JsonWriteNumberProp(dest, "v", version);
+    JsonWriteStringProp(dest, "client_id", applicationId);
+
+    dest -= 1;
+    *(dest - 1) = '}';
+    *dest = 0;
+}
+