Discussion of article "How to create bots for Telegram in MQL5" - page 15

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https://core.telegram.org/bots/api#sending-files
Telegram Bot API
  • core.telegram.org
The Bot API is an HTTP-based interface created for developers keen on building bots for Telegram. To learn how to create and set up a bot, please consult our Introduction to Bots and Bot FAQ . Recent changes June 4, 2020 Added the new field via_bot to the Message object. You can now know which bot was used to send a message. Supported video...
 
I'm sorry but I'm not sure of what I'm doing wrong. Do you mean that I can't locally send a photo and that I need to upload it to a server first?
 

SendPhoto

The class has implemented the opportunity to send photos with two ways of application.

int SendPhoto(const long   chat_id,
              const string local_path,
              string       &photo_id,
              const string caption=NULL,
              const bool   common_flag=false,
              const int    timeout=10000)
 chat_id  chat number
 local_path  local path to the folder in <data folder>\MQL5\Files
 photo_id  identifier of the photo uploaded to the server
 caption  signature text below photo
 common_flag  file location flag in the common folder of all client terminals \Terminal\Common\Files
 timeout  operation time out in milliseconds

There are several way's to send a photo.

CCustomBot bot;

string token = "208375865:AAFnuOjlZ3Wsdan6PAjeqqUtBybe0Di1or8";

bot.Token(token);

string photo_id;
int result=bot.SendPhoto(198289825,"EURUSD1.gif",photo_id,"screenshot");
if(result==0)
   Print("Photo ID: ",photo_id);
else
   Print("Error: ",GetErrorDescription(result));

I can see that you have a minus sign.

You can look in the Telegram.mqh file.

//+------------------------------------------------------------------+
   int SendPhoto(const long   _chat_id,
                 const string _photo_id,
                 const string _caption=NULL)
     {
      if(m_token==NULL)
         return(ERR_TOKEN_ISEMPTY);

      string out;
      string url=StringFormat("%s/bot%s/sendPhoto",TELEGRAM_BASE_URL,m_token);
      string params=StringFormat("chat_id=%lld&photo=%s",_chat_id,_photo_id);
      if(_caption!=NULL)
         params+="&caption="+UrlEncode(_caption);

      int res=PostRequest(out,url,params,WEB_TIMEOUT);
      if(res!=0)
        {
         //--- parse result
         CJAVal js(NULL,jtUNDEF);
         bool done=js.Deserialize(out);
         if(!done)
            return(ERR_JSON_PARSING);

         //--- get error description
         bool ok=js["ok"].ToBool();
         long err_code=js["error_code"].ToInt();
         string err_desc=js["description"].ToStr();
        }
      //--- done
      return(res);
     }

   //+------------------------------------------------------------------+
   int SendPhoto(string &_photo_id,
                 const string _channel_name,
                 const string _local_path,
                 const string _caption=NULL,
                 const bool _common_flag=false,
                 const int _timeout=10000)
     {
      if(m_token==NULL)
         return(ERR_TOKEN_ISEMPTY);

      string name=StringTrim(_channel_name);
      if(StringGetCharacter(name,0)!='@')
         name="@"+name;

      if(m_token==NULL)
         return(ERR_TOKEN_ISEMPTY);

      ResetLastError();
      //--- copy file to memory buffer
      if(!FileIsExist(_local_path,_common_flag))
         return(ERR_FILE_NOT_EXIST);

      //---
      int flags=FILE_READ|FILE_BIN|FILE_SHARE_WRITE|FILE_SHARE_READ;
      if(_common_flag)
         flags|=FILE_COMMON;

      //---
      int file=FileOpen(_local_path,flags);
      if(file<0)
         return(_LastError);

      //---
      int file_size=(int)FileSize(file);
      uchar photo[];
      ArrayResize(photo,file_size);
      FileReadArray(file,photo,0,file_size);
      FileClose(file);

      //--- create boundary: (data -> base64 -> 1024 bytes -> md5)
      uchar base64[];
      uchar key[];
      CryptEncode(CRYPT_BASE64,photo,key,base64);
      //---
      uchar temp[1024]={0};
      ArrayCopy(temp,base64,0,0,1024);
      //---
      uchar md5[];
      CryptEncode(CRYPT_HASH_MD5,temp,key,md5);
      //---
      string hash=NULL;
      int total=ArraySize(md5);
      for(int i=0;i<total;i++)
         hash+=StringFormat("%02X",md5[i]);
      hash=StringSubstr(hash,0,16);

      //--- WebRequest
      uchar result[];
      string result_headers;

      string url=StringFormat("%s/bot%s/sendPhoto",TELEGRAM_BASE_URL,m_token);

      //--- 1
      uchar data[];

      //--- add chart_id
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,"--"+hash+"\r\n");
      ArrayAdd(data,"Content-Disposition: form-data; name=\"chat_id\"\r\n");
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,name);
      ArrayAdd(data,"\r\n");

      if(StringLen(_caption)>0)
        {
         ArrayAdd(data,"--"+hash+"\r\n");
         ArrayAdd(data,"Content-Disposition: form-data; name=\"caption\"\r\n");
         ArrayAdd(data,"\r\n");
         ArrayAdd(data,_caption);
         ArrayAdd(data,"\r\n");
        }

      ArrayAdd(data,"--"+hash+"\r\n");
      ArrayAdd(data,"Content-Disposition: form-data; name=\"photo\"; filename=\"lampash.gif\"\r\n");
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,photo);
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,"--"+hash+"--\r\n");

      // SaveToFile("debug.txt",data);

      //---
      string headers="Content-Type: multipart/form-data; boundary="+hash+"\r\n";
      int res=WebRequest("POST",url,headers,_timeout,data,result,result_headers);
      if(res==200)//OK
        {
         //--- delete BOM
         int start_index=0;
         int size=ArraySize(result);
         for(int i=0; i<fmin(size,8); i++)
           {
            if(result[i]==0xef || result[i]==0xbb || result[i]==0xbf)
               start_index=i+1;
            else
               break;
           }

         //---
         string out=CharArrayToString(result,start_index,WHOLE_ARRAY,CP_UTF8);

         //--- parse result
         CJAVal js(NULL,jtUNDEF);
         bool done=js.Deserialize(out);
         if(!done)
            return(ERR_JSON_PARSING);

         //--- get error description
         bool ok=js["ok"].ToBool();
         if(!ok)
            return(ERR_JSON_NOT_OK);

         total=ArraySize(js["result"]["photo"].m_e);
         for(int i=0; i<total; i++)
           {
            CJAVal image=js["result"]["photo"].m_e[i];

            long image_size=image["file_size"].ToInt();
            if(image_size<=file_size)
               _photo_id=image["file_id"].ToStr();
           }

         return(0);
        }
      else
        {
         if(res==-1)
           {
            string out=CharArrayToString(result,0,WHOLE_ARRAY,CP_UTF8);
            //Print(out);
            return(_LastError);
           }
         else
           {
            if(res>=100 && res<=511)
              {
               string out=CharArrayToString(result,0,WHOLE_ARRAY,CP_UTF8);
               //Print(out);
               return(ERR_HTTP_ERROR_FIRST+res);
              }
            return(res);
           }
        }
      //---        
      return(0);
     }

   //+------------------------------------------------------------------+
   int SendPhoto(string &_photo_id,
                 const long _chat_id,
                 const string _local_path,
                 const string _caption=NULL,
                 const bool _common_flag=false,
                 const int _timeout=10000)
     {
      if(m_token==NULL)
         return(ERR_TOKEN_ISEMPTY);

      ResetLastError();
      //--- copy file to memory buffer
      if(!FileIsExist(_local_path,_common_flag))
         return(ERR_FILE_NOT_EXIST);

      //---
      int flags=FILE_READ|FILE_BIN|FILE_SHARE_WRITE|FILE_SHARE_READ;
      if(_common_flag)
         flags|=FILE_COMMON;

      //---
      int file=FileOpen(_local_path,flags);
      if(file<0)
         return(_LastError);

      //---
      int file_size=(int)FileSize(file);
      uchar photo[];
      ArrayResize(photo,file_size);
      FileReadArray(file,photo,0,file_size);
      FileClose(file);

      //--- create boundary: (data -> base64 -> 1024 bytes -> md5)
      uchar base64[];
      uchar key[];
      CryptEncode(CRYPT_BASE64,photo,key,base64);
      //---
      uchar temp[1024]={0};
      ArrayCopy(temp,base64,0,0,1024);
      //---
      uchar md5[];
      CryptEncode(CRYPT_HASH_MD5,temp,key,md5);
      //---
      string hash=NULL;
      int total=ArraySize(md5);
      for(int i=0;i<total;i++)
         hash+=StringFormat("%02X",md5[i]);
      hash=StringSubstr(hash,0,16);

      //--- WebRequest
      uchar result[];
      string result_headers;

      string url=StringFormat("%s/bot%s/sendPhoto",TELEGRAM_BASE_URL,m_token);

      //--- 1
      uchar data[];

      //--- add chart_id
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,"--"+hash+"\r\n");
      ArrayAdd(data,"Content-Disposition: form-data; name=\"chat_id\"\r\n");
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,IntegerToString(_chat_id));
      ArrayAdd(data,"\r\n");

      if(StringLen(_caption)>0)
        {
         ArrayAdd(data,"--"+hash+"\r\n");
         ArrayAdd(data,"Content-Disposition: form-data; name=\"caption\"\r\n");
         ArrayAdd(data,"\r\n");
         ArrayAdd(data,_caption);
         ArrayAdd(data,"\r\n");
        }

      ArrayAdd(data,"--"+hash+"\r\n");
      ArrayAdd(data,"Content-Disposition: form-data; name=\"photo\"; filename=\"lampash.gif\"\r\n");
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,photo);
      ArrayAdd(data,"\r\n");
      ArrayAdd(data,"--"+hash+"--\r\n");

      // SaveToFile("debug.txt",data);

      //---
      string headers="Content-Type: multipart/form-data; boundary="+hash+"\r\n";
      int res=WebRequest("POST",url,headers,_timeout,data,result,result_headers);
      if(res==200)//OK
        {
         //--- delete BOM
         int start_index=0;
         int size=ArraySize(result);
         for(int i=0; i<fmin(size,8); i++)
           {
            if(result[i]==0xef || result[i]==0xbb || result[i]==0xbf)
               start_index=i+1;
            else
               break;
           }

         //---
         string out=CharArrayToString(result,start_index,WHOLE_ARRAY,CP_UTF8);

         //--- parse result
         CJAVal js(NULL,jtUNDEF);
         bool done=js.Deserialize(out);
         if(!done)
            return(ERR_JSON_PARSING);

         //--- get error description
         bool ok=js["ok"].ToBool();
         if(!ok)
            return(ERR_JSON_NOT_OK);

         total=ArraySize(js["result"]["photo"].m_e);
         for(int i=0; i<total; i++)
           {
            CJAVal image=js["result"]["photo"].m_e[i];

            long image_size=image["file_size"].ToInt();
            if(image_size<=file_size)
               _photo_id=image["file_id"].ToStr();
           }

         return(0);
        }
      else
        {
         if(res==-1)
           {
            string out=CharArrayToString(result,0,WHOLE_ARRAY,CP_UTF8);
            //Print(out);
            return(_LastError);
           }
         else
           {
            if(res>=100 && res<=511)
              {
               string out=CharArrayToString(result,0,WHOLE_ARRAY,CP_UTF8);
               //Print(out);
               return(ERR_HTTP_ERROR_FIRST+res);
              }
            return(res);
           }
        }
      //---        
      return(0);
     }
   //+------------------------------------------------------------------+

If you look in the mqh file you can see 

      string name=StringTrim(_channel_name);
      if(StringGetCharacter(name,0)!='@')
         name="@"+name;

So in your case you can try a modification like this

      string name = _channel_name;
      //if(StringGetCharacter(name,0)!='@')
      //   name="@"+name;
 
tdbguy:

Do not double post!

I will delete your topic and move the replies here.

 
John Progton:

Andrey Voytenko basically i added the files that you use and then modified the script I have to send to telegram instead of email when executing a trade action. That works except when opening a trade it will send the message multiple times

Same problems
 

I comfirm that with little modifaction from post #46, the code is working fine on MT5 for send alerts to channels.

Comfirm also that send requests to the bot for control EA is working.

But anyone succedd to lock this requests from bot to EA at only some "from_id" ?  So the bot only listen requests from specific ID. 

 
huwa:

I comfirm that with little modifaction from post #46, the code is working fine on MT5 for send alerts to channels.

Comfirm also that send requests to the bot for control EA is working.

But anyone succedd to lock this requests from bot to EA at only some "from_id" ?  So the bot only listen requests from specific ID. 

For those who want to lock the Bot request to Telegram Account ID, find this line in Telegram.mqh :


//--- filter
   //if(m_users_filter.Total()==0 || (m_users_filter.Total()>0 && m_users_filter.SearchLinear(msg.from_username)>=0))   //Remove this line from code
   if(msg.from_id==??????????)   //Add this line to code where ?????????? is your Telegram Account ID


 
Wow thank you Andrey Voytenko for sharing your knowledge, it's very helpful for beginner like me

Telegram_Bot_EA and Telegram_Search_EA running very well, but not with the last one ( Telegram_signal_EA ).
I didn't get signal in my channel.

What I did is:
- Make a bot, add to my channel and set to administrator
- Changing your code with my indicator
- Changing Telegram.mqh to make private channel

After I run Telegram_singal_EA, I can see my Bot name but still didn't get any signal.


Every tick I got error:

Telegram_Signal_EA GBPUSD,M1: Error:Bad Request

Telegram_Signal_EA GBPUSD,M1: {"ok":false,"error_code":400,"description":"Bad Request: chat not found"}


Do you have any suggestions?

 

@ade kurniawan you should work with private channels using chat ID (not channel name).

 
Andrey Voytenko:

@ade kurniawan you should work with private channels using chart ID (not channel name).

Yes I already change it. Still with same error. Even I change everything to public channel
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