Different behaviour of Shell Execute vs batch

AFL Programming
,
#1

I am currently doing a project where I am learning how to get data from a public endpoint API (specifically binance) with a view to eventually being able to autotrade.

The method I have chosen is to create a folder, and in that folder create a html file, and place a string input into that file.
It works and I am getting the data I want from Binance API.

fmkdir("C:\\Program Files\\AmiBroker\\Export\\");
path= "C:\\Program Files\\AmiBroker\\Export\\" + Name() + ".html";
fh = fopen(path,"w");



if(fh)
{
filecontent = StrFormat(
	"<html>"
	+"\n<body>"
	+"\n</body>"
	+"\n<script>"

	+"\nvar burl ='https://api1.binance.com';"
    
	+"\nvar query = '/api/v3/klines';"
    
	+"\nquery += '?symbol="
	+ Name() + "&interval=1d&limit=20';"
    
	+"\nvar url = burl + query;"
    
	+"\nvar ourRequest = new XMLHttpRequest();"

	+"\nourRequest.open('GET',url,true);"
	+"\nourRequest.onload = function(){"
	+	"\nconsole.log(ourRequest.responseText);"
	+"\n}"
	+"\nourRequest.send();"
    
	+"\n</script>"
	+"\n</html>;");
	
	fputs(filecontent,fh);
	
	fclose(fh);
	
	ShellExecute(path,"","",1);
	
}

However, I needed to click through some menus to open the developer console, which was cumbersome.
After an internet trawl, I found that by entering "C:\Program Files\Google\Chrome\Application\chrome.exe" -auto-open-devtools-for-tabs , into the command prompt, I get a browser launched into the developer console, but still, this relies on me first manually doing this.

So then I started playing with batch, and if I create a batch;
Action: Execute and Wait,
Parameter/File: "C:\Program Files\Google\Chrome\Application\chrome.exe" -auto-open-devtools-for-tabs

and run it, again, I get the developer tab in Chrome. Great.
So next, I saved the command as a batch file and I used this code...

ShellExecute("runbatch","C:\\Program Files\\AmiBroker\\Scripts\\Batch\\Load Chrome.abb","",1);

That works, when it is executed by itself. I get a single browser tab, opened in the developer consoler.

However, this still does not solve my problem. When I run it combined with the code write the html file for the binance API, I don't get what it is I am looking for....

ShellExecute("runbatch","C:\\Program Files\\AmiBroker\\Scripts\\Batch\\Load Chrome.abb","",1);

fmkdir("C:\\Program Files\\AmiBroker\\Export\\");
path= "C:\\Program Files\\AmiBroker\\Export\\" + Name() + ".html";
fh = fopen(path,"w");



if(fh)
{
filecontent = StrFormat(
	"<html>"
	+"\n<body>"
	+"\n</body>"
	+"\n<script>"

	+"\nvar burl ='https://api1.binance.com';"
    
	+"\nvar query = '/api/v3/klines';"
    
	+"\nquery += '?symbol="
	+ Name() + "&interval=1d&limit=20';"
    
	+"\nvar url = burl + query;"
    
	+"\nvar ourRequest = new XMLHttpRequest();"

	+"\nourRequest.open('GET',url,true);"
	+"\nourRequest.onload = function(){"
	+	"\nconsole.log(ourRequest.responseText);"
	+"\n}"
	+"\nourRequest.send();"
    
	+"\n</script>"
	+"\n</html>;");
	
	fputs(filecontent,fh);
	
	fclose(fh);
	
	ShellExecute(path,"","",1);
	
}

I end up with 2 browsers, neither of which are opened in the console.
Any idea, critique or suggested alternative approaches, would be hugely welcome.

Thanks so much.

Spandy.

#2

In windows CMD, the following works

start chrome -auto-open-devtools-for-tabs c:\path\to\htmlfile.html

so you can send 2 arguments, the devtools option as well as the full path of html file.

If you are combining them, first write to file and pass the file to chrome in a single ShellExecute().

You are using 2 separate ShellExecute() calls which wont do the job.

In AB, this works. Space separates the two arguments.

ShellExecute("chrome","-auto-open-devtools-for-tabs c:\\path\\to\\htmlfile.html","", 1);

If you have spaces in path, make sure to escape properly.
Also in my case, once Google chrome is running, the subsequent calls open new tabs in the same Chrome instance.

1 Like
#3

Awesome!! Thanks so much.

I had to replace each space with %20 and use forward slashes. I set up a new array for that job and it works

So;

path= "C:\\Program Files\\AmiBroker\\Export\\" + Name() + ".html";
path2= "file:///C:/Program%20Files/AmiBroker/Export/"+ Name() + ".html";

and then on executuion I had to manually add a space using " ", which ended up looking like this...

ShellExecute("chrome","-auto-open-devtools-for-tabs"+" "+path2,"",1);

Thanks so much!!!

1 Like
#4

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