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Converting a String into Known Variable

  • #1
  • First Post: Edited 3:20pm May 23, 2010 12:21pm | Edited 3:20pm
Here is a a quick question. Is there a way of converting a string into a known variable? What I hope to do is convert a series of known variables into strings, then call them up in an array (using for loop) and convert them back into variables, before doing the required math.

I don't know, is this possible?

Thanks in advance.
  • #2
  • Edited 2:57pm May 23, 2010 2:53pm | Edited 2:57pm
I can't tell if you are trying to do a macro substitution or some other kind of preprocessing of the source code?

Do you intend to read the .MQ4 and parse out the variables from the program declarations and then write out a new source file? I suppose that is possible as long as you stick to your own code files and coding style. But if you intend to use it as a general purpose tool on anybody's code, I think you are in for a lot of work. MQL4 doesn't have the file and string handling capabilities of other languages, but it could do it.

Edit: One suggestion - don't try to do it with a .MQ4 file, restrict yourself to .MQH header files and adopt a strict set of rules as to the ordering of declarations.
  • #3
  • May 23, 2010 3:17pm May 23, 2010 3:17pm
Actually, I think I just figured it out, and what I'm asking for is not necessary. I think all I need to do is specify the the variable values themselves within the array and remember where they are indexed, and call them up when it's time to do the calculations. Meaning there's no need to specify the actual variable so long its value is indexed correctly. In other words I can recall it array_123[4] and, so long as the value is correct and it's in the proper sequence, it should work ... I think? We'll see.

Oh well, this is basically what I was already doing with the other variables in the statement, and I don't know what got me thinking this way? Maybe just too many?

But hey, thanks for the reply.
  • #4
  • May 23, 2010 3:28pm May 23, 2010 3:28pm
I'm used to working with variables within the same series, but not variables from different functions, which is what I'm trying to do here. But, then again, so long as I have it indexed and formatted properly it should work.
  • #5
  • May 23, 2010 3:48pm May 23, 2010 3:48pm
Well, I still can't figure out what you want to do. But if improved code clarity is your goal use #define constants as your array indices as in:
#define IX_HIGH 3;
  • #6
  • May 23, 2010 4:27pm May 23, 2010 4:27pm
Rather than trying to explain, here is the actual code:

PHP Code
   gl_var[1]=ca_spd;        gl_var[2]=spd_nc;        gl_var[3]=re_spd;           gl_var[4]=ct_price;    gl_var[5]=ct_enable;           gl_var[6]=ac_percent;
   gl_val[1]=7;             gl_val[2]=7;             gl_val[3]=7;                gl_val[4]=0;           gl_val[5]=1;                   gl_val[6]=0;
   gl_set[1]=1;             gl_set[2]=1;             gl_set[3]=1;                gl_set[4]=ct_price;    gl_set[5]=1;                   gl_set[6]=ac_percent;
   global[1]="closeall_2";  global[2]="suspend_nc";  global[3]="reset_suspend";  global[4]="ct_price";  global[5]="global_ct_enable";  global[6]="closeall_2";
   //----
   for(int v=1; v<=6; v++){
   if(gl_var[v]==gl_val[v]){ GlobalVariableSet("global_"+global[v],gl_set[v]); } else if(!GlobalVariableCheck("global_"+global[v])){ GlobalVariableSet("global_"+global[v],false); } }
Here is what I'm trying to replace:

PHP Code
 if(ca_spd==7){ GlobalVariableSet("global_closeall_2",true); } else  if(!GlobalVariableCheck("global_closeall_2")) { GlobalVariableSet("global_closeall_2",false); }
   if(spd_nc==7){ GlobalVariableSet("global_suspend_nc",true); }  else  if(!GlobalVariableCheck("global_suspend_nc")){ GlobalVariableSet("global_suspend_nc",false); }
   if(re_spd==7){ GlobalVariableSet("global_reset_suspend",true); } else  if(!GlobalVariableCheck("global_reset_suspend")){ GlobalVariableSet("global_reset_suspend",false); }
   if(ct_price>0){ GlobalVariableSet("global_ct_price",ct_price); }   else  if(!GlobalVariableCheck("global_ct_price")){ GlobalVariableSet("global_ct_price",false); }
   if(ct_enable==true){ GlobalVariableSet("global_ct_enable",true); }   else  if(!GlobalVariableCheck("ct_enable")){ GlobalVariableSet("ct_enable",false); }
   if(ac_percent>0){ GlobalVariableSet("global_auto_close",ac_percent); } else  if(!GlobalVariableCheck("global_auto_close")){ GlobalVariableSet("global_ac_percent",false); }
There was just some confusion aboiut how to call out gl_var[] and gl_val[] ... as gl_var[] is the different variables I'm talking about and gl_val[] are the values. I'm just not used to calling out gl_var in this way ... pooling from different variables, that is.

I'm just trying to clean things up a bit.
  • #7
  • May 23, 2010 6:54pm May 23, 2010 6:54pm
I have been busy cleaning up somebody else's mess myself and had to stay focused on that until I got it done. Right now, I am exhausted from the effort, so I will have to pass rather than say something I will regret later.
  • #8
  • Last Post: May 23, 2010 11:47pm May 23, 2010 11:47pm
Hey, that's alright. By the way, I am just now in the process of troubleshooting and found a few bugs already. I had only just figured out the equation before I posted it, and now realize it won't work unless I do something like this ...

PHP Code
if((v<2 && gl_var[v]>gl_val[v] || (v>=2 && gl_var[v]==gl_val[v]){ ... }
I actually got one or two globals to work, and I think this explains why the rest won't work. So we're getting there ...
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