138 lines
5.6 KiB
Plaintext
138 lines
5.6 KiB
Plaintext
//+------------------------------------------------------------------+
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//| ZmqMsg.mqh |
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//| Copyright 2016, Li Ding |
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//| dingmaotu@hotmail.com |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2016, Li Ding"
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#property link "dingmaotu@hotmail.com"
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#property strict
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#include "Common.mqh"
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//+------------------------------------------------------------------+
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//| 0MQ Message struct |
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//+------------------------------------------------------------------+
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// align sizeof(intptr_t)
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// = 8 on 64bit
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// = 4 on 32bit
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// hopefully MetaQuotes do malloc structs
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// aligned on pointer address boundaries
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struct zmq_msg_t
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{
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uchar _[64];
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};
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#import "libzmq.dll"
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int zmq_msg_init(zmq_msg_t &msg);
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int zmq_msg_init_size(zmq_msg_t &msg,size_t size);
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// As mt4 can not provide a zmq_free_fn, and can not let
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// zmq library own the array data, copying is always needed.
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// Therefore this function will not be used by this binding.
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// int zmq_msg_init_data(zmq_msg_t &msg,uchar &data[],
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// int size,int ffn,int hint);
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int zmq_msg_close(zmq_msg_t &msg);
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int zmq_msg_move(zmq_msg_t &dest,zmq_msg_t &src);
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int zmq_msg_copy(zmq_msg_t &dest,zmq_msg_t &src);
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// char *
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intptr_t zmq_msg_data(zmq_msg_t &msg);
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int zmq_msg_size(zmq_msg_t &msg);
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int zmq_msg_more(zmq_msg_t &msg);
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int zmq_msg_get(zmq_msg_t &msg,int property);
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int zmq_msg_set(zmq_msg_t &msg,int property,int optval);
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// const char *
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intptr_t zmq_msg_gets(zmq_msg_t &msg,const char &property[]);
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#import
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//+------------------------------------------------------------------+
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//| Wraps a zmq_msg_t |
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//+------------------------------------------------------------------+
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struct ZmqMsg: public zmq_msg_t
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{
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protected:
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int get(int property) {return zmq_msg_get(this,property);}
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bool set(int property,int value) {return 0==zmq_msg_set(this,property,value);}
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intptr_t data() {return zmq_msg_data(this);}
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bool setStringData(string data,bool nullterminated=false);
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public:
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ZmqMsg() {zmq_msg_init(this);}
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ZmqMsg(int size) {if(0!=zmq_msg_init_size(this,size)){Debug("Failed to init size msg: insufficient space");}}
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ZmqMsg(string data,bool nullterminated=false) {setStringData(data,nullterminated);}
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~ZmqMsg() {if(0!=zmq_msg_close(this)){Debug("Failed to close msg");}}
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bool rebuild()
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{
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if(0!=zmq_msg_close(this)){Debug("Failed to close msg");return false;}
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return 0==zmq_msg_init(this);
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}
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bool rebuild(int size)
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{
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if(0!=zmq_msg_close(this)){Debug("Failed to close msg");return false;}
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return 0==zmq_msg_init_size(this,size);
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}
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bool rebuild(string data,bool nullterminated=false)
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{
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if(0!=zmq_msg_close(this)){Debug("Failed to close msg");return false;}
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return setStringData(data,nullterminated);
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}
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size_t size() {return zmq_msg_size(this);}
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void getData(uchar &data[]);
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string getData();
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void setData(const uchar &data[]);
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bool more() {return 1==zmq_msg_more(this);}
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bool copy(ZmqMsg &msg) {return 0 == zmq_msg_copy(this, msg);}
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bool move(ZmqMsg &msg) {return 0 == zmq_msg_move(this, msg);}
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string meta(const string property);
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};
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//+------------------------------------------------------------------+
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//| Initialize a utf-8 string message |
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//+------------------------------------------------------------------+
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bool ZmqMsg::setStringData(string data,bool nullterminated)
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{
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uchar array[];
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StringToUtf8(data,array,nullterminated);
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bool res=(0==zmq_msg_init_size(this,ArraySize(array)));
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if(res)setData(array);
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return res;
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}
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//+------------------------------------------------------------------+
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//| Get message data as bytes array |
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//+------------------------------------------------------------------+
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void ZmqMsg::getData(uchar &data[])
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{
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size_t size=size();
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intptr_t src=data();
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ArrayResize(data,(int)size);
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ArrayFromPointer(data,src);
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}
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//+------------------------------------------------------------------+
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//| Get message data as utf-8 string |
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//+------------------------------------------------------------------+
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string ZmqMsg::getData()
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{
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size_t size=size();
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intptr_t psz=data();
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return StringFromUtf8Pointer(psz,(int)size);
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}
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//+------------------------------------------------------------------+
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//| copy data to message internal storage |
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//+------------------------------------------------------------------+
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void ZmqMsg::setData(const uchar &data[])
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{
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intptr_t dest=data();
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ArrayToPointer(data,dest);
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}
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//+------------------------------------------------------------------+
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//| Wraps zmq_msg_gets: get metadata associated with the msg |
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//+------------------------------------------------------------------+
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string ZmqMsg::meta(const string property)
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{
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uchar buf[];
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StringToUtf8(property,buf);
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intptr_t ref=zmq_msg_gets(this,buf);
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ArrayFree(buf);
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return StringFromUtf8Pointer(ref);
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}
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//+------------------------------------------------------------------+
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