正确实现ImageMessage.ToJson();

Author: cyanray

examples/SendImageMessage.cpp

@@ -13,16 +13,15 @@ int main(int argc, char* argv[])
 	bot.Connect(opts);
 	cout << "Bot working..." << endl;
 
-	FriendImage img = bot.UploadFriendImage("D:\\test.png");
-	GroupImage gImg = bot.UploadGroupImage("D:\\test.png");
-	TempImage tImg = bot.UploadTempImage("D:\\test.png");
+	string ImagePath("E:/test.png");
 
 	bot.On<FriendMessage>(
-		[&](FriendMessage fm)
+		[&](FriendMessage m)
 		{
 			try
 			{
-				fm.Reply(MessageChain().Image(img));
+				FriendImage img = bot.UploadFriendImage(ImagePath);
+				m.Reply(MessageChain().Image(img));
 			}
 			catch (const std::exception& ex)
 			{
@@ -31,11 +30,12 @@ int main(int argc, char* argv[])
 		});
 
 	bot.On<GroupMessage>(
-		[&](GroupMessage gm)
+		[&](GroupMessage m)
 		{
 			try
 			{
-				bot.SendMessage(gm.Sender.Group.GID, MessageChain().Image(gImg));
+				GroupImage gImg = bot.UploadGroupImage(ImagePath);
+				bot.SendMessage(m.Sender.Group.GID, MessageChain().Image(gImg));
 			}
 			catch (const std::exception& ex)
 			{
@@ -44,11 +44,12 @@ int main(int argc, char* argv[])
 		});
 
 	bot.On<TempMessage>(
-		[&](TempMessage gm)
+		[&](TempMessage m)
 		{
 			try
 			{
-				gm.Reply(MessageChain().Image(tImg));
+				TempImage tImg = bot.UploadTempImage(ImagePath);
+				m.Reply(MessageChain().Image(tImg));
 			}
 			catch (const std::exception& ex)
 			{

include/mirai/messages/ImageMessage.hpp

@@ -72,14 +72,26 @@ namespace Cyan
 		}
 		virtual json ToJson() const override
 		{
-			return
+			json result = 
 			{
-				{ "type", GetType() },
-				{ "imageId", imageId_ },
-				{ "url", url_ },
-				{ "path", path_ },
-				{ "base64", base64_ }
+				{ "type", GetType() }
 			};
+			imageId_.empty() 
+				? result["imageId"] = json(nullptr) 
+				: result["imageId"] = imageId_;
+
+			url_.empty()
+				? result["url"] = json(nullptr)
+				: result["url"] = url_;
+
+			path_.empty()
+				? result["path"] = json(nullptr)
+				: result["path"] = path_;
+
+			base64_.empty()
+				? result["base64"] = json(nullptr)
+				: result["base64"] = base64_;
+			return result;
 		}
 		virtual ~ImageMessage() {}