MQL4 Array - Problem 2 replies. Resizing the 2nd dimension of an array 0 replies. Calculate Stochastic Formula on a array non indicator buffer array 2 replies. How to get 2-dimension array to file and than get back it [MQL4].
First Post : Nov 3, pm Nov 3, pm. Joined Jul Status: Member 23 Posts. Additionally i'd like to save big precision of my numbers and i was pondering to use FileWriteDouble funcion in binary. Could somebody help me - i appreciate it a lot! Nov 3, pm Nov 3, pm. I doubt if I or many other on this forum could improve on the code in the linked article.
I didn't review it in depth, so there may be a small detail I missed. But as a starting point, it is good enough. I don't think you have a very good understanding of numbers and how computer's handle numbers. In MT4, the most precision that you need is 5 decimal places. The MQL4 double variable type has 16 decimal digits of precision, the same as most other modern language double types.
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I need to use the value of Should this script work correctly if I just copy and paste it straight in to the MetaQuotes Language Editor and compile it? I am running the above code as a Script not an Expert Advisor ; is this okay? I need to make the value of Once we add further parameters to the plain URLthe remote-side the HttpServer changes the reply to just the one row we are interested in:.
The real interchange dialogue between the local process curl now, but MetaTrader Terminal later looks this way using a --verbose option in curl commandline :. So the magic is to make MetaTrader Terminal to assemble the same, together with allowing the URL in the permitted list in the configuration that you have done already in the other post.Zadar zene
The magic is in making MQL4 code send the same request as was seen above and get the data back. Meeting all the conditions at once should result in receivingLearn more.
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Defines length of a resulting string. Terminating zero will also be copied to the recipient array, in this case the size of a dynamic array can be increased if necessary to the size of the string.
If the size of the dynamic array exceeds the length of the string, the size of the array will not be reduced.
For the most-used code pages provide appropriate constants. If so, how?For security reasons, work with files is strictly controlled in the MQL4 language. Files with which file operations are conducted using MQL4 means cannot be outside the file sandbox.
There are two directories with subdirectories in which working files can be located:. File functions allow working with so-called "named pipes". To do this, simply call FileOpen function with appropriate parameters. Starts the search of files in a directory in accordance with the specified filter. Continues the search started by the FileFindFirst function. Defines the end of a file in the process of reading.
Defines the end of a line in a text file in the process of reading. Copies the original file from a local or shared folder to another file.
Reads arrays of any type except for string from the file of the BIN type. Reads from the file of the CSV type a string from the current position till a delimiter or till the end of a text line and converts the read string to a value of bool type. Reads a double value from the current position of the file pointer.
Reads a float value from the current position of the file pointer. Reads int, short or char value from the current position of the file pointer. Reads a long type value from the current position of the file pointer. Reads from the file of the CSV type a string from the current position till a delimiter or til the end of a text line and converts the read string into double value.
Sorting CSV to Array.
Reads a string from the current position of a file pointer from a file. Moves the position of the file pointer by a specified number of bytes relative to the specified position. Returns the current position of the file pointer of a corresponding open file. Writes arrays of any type except for string into a file of BIN type. Writes value of the double type from the current position of a file pointer into a binary file.
Writes value of the float type from the current position of a file pointer into a binary file. Writes value of the int type from the current position of a file pointer into a binary file.
Writes value of the long type from the current position of a file pointer into a binary file. Writes the contents of a structure passed as a parameter into a binary file, starting from the current position of the file pointer. Removes a selected directory. If the folder is not empty, then it can't be removed. Opens file in the current history directory or in its subfolders.Handbook on printing technology pdf
If the file is opened for writing using FileOpenall subfolders specified in the path will be created if there are no such ones. If the folder is not empty, then it can't be removed FolderClean Deletes all files in the specified folder FileOpenHistory Opens file in the current history directory or in its subfolders.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I've used the following code to create an array from a simple CSV file, but it doesn't work right when one of my fields has multiple commas - such as addresses. The above code doesn't work with the following CSV file example. First column is name, second column is address, third column is marital status.
Like you said in your title, fgetcsv is the way to go. It's pretty darn easy to use. You'll want to put more error checking in there in case fopen fails, but this works to read a CSV file line by line and parse the line into an array. I have created a function which will convert a csv string to an array.
The function knows how to escape special characters, and it works with or without enclosure chars. Old question, but still relevant for PHP 5. I've written a small function that works with fgetcsv itself. Please fin below a link to the function from knagode, enhanced with a skip rows parameter. Learn more. Asked 10 years, 8 months ago. Active 1 month ago.All6mq_mappa dei processi_rev1
Viewed k times. Can someone kindly provide a code to create an array from a CSV file using fgetcsv? Scott L. Thomas Thomas 1, 1 1 gold badge 10 10 silver badges 11 11 bronze badges.
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I feel for you, I'm in the same boat with my hosting provider. You can use this helper: github.I've encountered a problem in my attempt to read from. I was wondering if there is a way to format csv for it to be readable by MQL5?
If somebody had a similar problem in the past or simply is a very smart person, could you please help me resolve this issue? My csv content generated by C is similar to this I tried inserting tabs to match the format of MQL5 written files and changing Codepages in FileOpen - nothing worked :.
Speaking of csv, if anyone knows how to programmatically delete the last empty row the FileWrite method leaves when it finishes writing, I would really appreciate it if you tell me. I don't know anything about Cwhy don't you open that C 's csv with notepad. Pardon me, only if you don't mind, could you insert your file operation code here use SRC button to insert 'em and if possible attach some of your csv data file that generated by your Cjust make sure that your super secret data is not attached along way.Rundeck salt
See if any of us around here can replicate the same problem or Another thing that I kinda bored to ask, what's your OS? Burton : Not many people are polite these days, especially, when they attempt to make a joke. CSV files are located in I'm attaching one, please see below. The code, I'm using to open it, is not mine, I found it in one of the articles, though it's pretty straight forward and is able to locate and open the files and even read the ones written by MT5. No need to apologize, I probably unable to solve this err anyway - LOL - hopes other forumers also helps.
Oh dear, Win 7 There's no problem with MT4 and I found no error running this in my MT5, hope no error when you running this script coz you have different system than mine.
File Operations: Reading CSV
Since you have 10 rows and 20 data, I don't think the data array will hold it if we use the original script. And regarding your other Q delete the last empty rowmy answer is, I dunno :D.
To add comments, please log in or register. Burton Burton : Well, I did try that and many other things like typing integers into csv with a keyboard in a notepad, inserting tabs between them, changing separators, changing file handle properties, changing extension to. The thing that really pisses me off is that I cannot find any differences between my file and the one generated by mql5, neither in its content nor in its properties.
Only that FileReadString has no problems reading mql5 csv, and spits out gibberish when it attempts to read any other. This is the final stage of a very long project I was working on, and this stupid bug is driving me nuts. Please, help, anyone!
Not many people are polite these days, especially, when they attempt to make a joke. Files: Results. I'm sorry, but I have never worked with MT4, and I do apologize for not stating my question in an informative manner.
Andrey Voytenko Burton :. The code executes perfectly. Thank you for taking the time to help me. I'm new to the forum, so if there's a way to give you guys digital thumbs uplet me know how.Java - Import CSV File Into An Array
Burton : The code executes perfectly. Alain Verleyen Comments that do not relate to this topic, have been moved to " How to delete file content?The file is contain "", "" and "" each separated by a space Is there any way to get the "" or "" with the FileOpen and the FileRead function?
Although I understand some parts of your code, overall I'm not get in to it very well. Would you please explain each smaller loops? Thanks, I'll think about it. But how to get the 2nd or the 3rd variable? I can't find any direct MQL4's function to do it.
THEN consider that eg: a function that is called with a number of 1 2 3 can read a "file record" and then return number from FileReadNumber 1 2 3. The filePointer or next Byte to read from, will be mapped to the next "file record":. Only for CSV files. To get the detailed error information, one has to call the GetLastError function. Parameters: handle - File handle returned by the FileOpen function.
Reading text file. To add comments, please log in or register. Erman Ardianto Hello All, It's me asking for help again. I have a text file, lets say it's name is "test. Many thanks. Count how many lines on a text file Read Log file My file read function was not working properly.Hi guys, I realise this question has been covered before, many times it seems I'm beginning to pull my hair out with this.
I must be missing something very basic I have a CSV file, with a single column of data, say 12 values I want to read in a value say the first value from this file and assign it to an integer. A few hours later, I want to update this integer value with the second value in the CSV, and so on. But this only returns the first value in the file, and does not step down through the file when I want to read the next value But this returns some strange values, presumably values of the specific byte where I have offset it to from the start of the file.
Is there a way I can tell the pointer to go to the next 'line' and return the value there? Incidentally, I guess it's important that I mention that some of the. Any help or advice would be appreciated I've spent about 6 hours today ready posts and different threads, and nothing seems to work for me. I also tried assigning all of the values to an array of size  but it kept returning zero. In case it makes any difference, I have been testing this by reading in the values from the CSV file and then trying to export the data to another output CSV file, so the code I have been using is basically:.
The only way I seem to be able to get this working is by using FileSize to read the size of the file, and then using FileSeek to position the pointer to the next location where I know there's data. This works ok, but I need to change the divisor 3 in this case as the numbers in the input file get bigger right? Surely there is an easier way to do this!? If I use. Any help would be greatly appreciated. Remember the EA gets called every tick. So file operations in the Start must be complete - i.
Open - Write - Close. Hi Ickyrus, the writing of the file seems to be working fine, no problems with it - I have been writing to CSV files from EAs without any problem. However I simply cannot read data from a CSV, at least no useful data The code I have at the moment looks like this:. Does that make sense? Nothing seems to work for me To add comments, please log in or register. Dave Cheers folks, FB.
If I use this approach as per my first post my output file simply contains the very first value of my input file, over and over again. Thanks, FB. How to code?
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