Any questions from newcomers on MQL4 and MQL5, help and discussion on algorithms and codes - page 240
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1) - This part opens file 11112222.txt to read data from it:
//=================================BUY=========================================
int handle2 = FileOpen("11112222.txt", FILE_CSV|FILE_READ, ";");//код открывает файл для чтения
2) - Next comes the condition if handle2>0
if(handle2>0) // если в файле больше 0, то есть 1, то открывать BUY
{
3) - This is the part I don't understand:
Print(FileReadString(handle2));
4) - This part closes the file:
FileClose(handle2); // закрытие текстового файла
5) - Since the condition handle2>0 is met, i.e. file 11112222.txt contains 1, a buy order is opened:
//ОТКРЫТИЕ ОРДЕРА НА ПОКУПКУ
if(OrdersTotal() == 0) // если нет открытых ордеров то открывать ордер на покупку
{
OrderSend(Symbol(), OP_BUY, 0.01, Ask, 3, 0, 0); // первым указывается ЛОСЬ, вторым ПРОФИТ
FileClose(handle2); // закрытие текстового файла
}
else
Print("NE USPESHNO!!!");
FileClose(handle2); // закрытие текстового файла
}
//=================================конец кода BUY=========================================
1) Opens the file, but does not read its contents.
2) The handle of the file is ALWAYS greater than zero. Accordingly, the condition will always hold if the file exists regardless of its contents.
3) This is exactly reading the contents of the file. Although I don't understand why reading a string is done, if we need to read a number... But still it can be another problem. Now the main thing is to describe the sequence of actions.
4) Of course, the file must be closed and it closes.
And only the next clause needs to be conditioned depending on what you read in clause 3, but not the second clause.
1) opens a file, but does not read its contents.
2) A file handle is ALWAYS larger than zero. Accordingly, the condition will always hold if the file exists regardless of its contents.
3) This is exactly reading the contents of the file. But I don't understand why reading a string is done, if a number is to be read... But still it can refer to another problem. Now the main thing is to describe the sequence of actions.
4) The file must be closed, of course, and it is being closed.
And only the next clause should be conditioned depending on what you read in clause 3, but not the second clause.
No... INVALID_HANDLE has value -1.
That's when it gets a file opening error, then it will get a sell signal...
Other constants
Special constants used to indicate the state of parameters and variables. Can be the following values:
Constant
Description
Value
NULL
Null of any type. Also indicates empty string state
0
EMPTY
Indicates empty state of parameter
-1
EMPTY_VALUE
Empty value in indicator buffer
2147483647 (0x7FFFFFFFF)
CLR_NONE, clrNONE
No colour. Default value, pointer to empty value. Used in custom indicators
-1
CHARTS_MAX
Maximum possible number of simultaneously opened charts in the terminal
100
INVALID_HANDLE
Incorrect handle
-1
IS_DEBUG_MODE
Sign of an mq5-program in debug mode
in debug mode is not equal to zero, otherwise 0
IS_PROFILE_MODE
Sign of an mq5-program in the profiling mode
in the profiling mode is not equal to zero, otherwise it is 0
WHOLE_ARRAY
Indicates the number of elements remaining to the end of the array, i.e. the whole array will be processed
0
WRONG_VALUE
A constant can be implicitly cast to any enum type
-1
Didn't see this thread, so I created a new one. please lookat https://www.mql5.com/ru/forum/206126
1) opens a file, but does not read its contents.
2) A file handle is ALWAYS greater than zero. Correspondingly, the condition will always hold if the file exists regardless of its contents.
3) This is exactly reading the contents of the file. But I don't understand why reading a string is done, if a number is to be read... But still it can refer to another problem. Now the main thing is to describe the sequence of actions.
4) The file must be closed, of course, and it is being closed.
And only the next item should be conditioned depending on what you read in item 3, but not the second item.
Dear MQL gurus - if you're not a problem, please help me with this code, I've spent half a day on search engines, but I haven't found anything similar.
I guess it's just a few lines, but for an experienced user it's a matter of minutes)))
How can a dll in c++ take a string from mql4 and convert it to char*?
This is the right code, isn't it?Hi all, could you advise me please, I wrote an EA about a year ago, it was working fine. I have not used it all this time. I do not know what to do with it, I just do not know what to do with it. Can it be because I have changed Build? I am currently using the Build 1090.
It seems to be a matter of a few lines, which for a knowledgeable person is a matter of three minutes)))
Took me two hours. I have to check the system piece by piece. Run both EAs at once on adjacent charts - everything will be visible. Expert Advisor 1 = Write to file
//+------------------------------------------------------------------+ //| Запись в файл -1 0 1 1.mq4 | //+------------------------------------------------------------------+ //+------------------------------------------------------------------+ //| Инициализация - установка интервала таймера | //+------------------------------------------------------------------+ void OnInit() { EventSetTimer(7); } //+------------------------------------------------------------------+ //| Деинициализация - удаление метки | //+------------------------------------------------------------------+ void OnDeinit(const int Зачем) { ObjectDelete("Семафор"); } //+------------------------------------------------------------------+ //| По таймеру каждые 7 секунд | //+------------------------------------------------------------------+ void OnTimer() { int x=0; if(rand()<20000) { x=1; if(rand()<16000) x=-1; } ObjectCreate("Семафор",OBJ_LABEL,0,0,0); ObjectCreate("Семафор", OBJ_LABEL, 0, 0, 0); // Создание ObjectSet("Семафор", OBJPROP_CORNER, 3); // В правый нижний угол ObjectSet("Семафор", OBJPROP_XDISTANCE, 0); // Координата X ObjectSet("Семафор", OBJPROP_YDISTANCE, 40); // Координата Y ObjectSetText("Семафор",(string)x+" Открываю",20,"Arial",Yellow); ChartRedraw(0); Sleep(2000); int handle = FileOpen("123.txt", FILE_BIN | FILE_WRITE); if(handle == -1) { ObjectSetText("Семафор","Ошибка",20,"Arial",Salmon); ChartRedraw(0); return; } ObjectSetText("Семафор",(string)x+" Записываю",20,"Arial",DeepSkyBlue); ChartRedraw(0); FileWriteInteger(handle, x, 4); Sleep(2000); ObjectSetText("Семафор","",20,"Arial",White); ChartRedraw(0); FileClose(handle); }EA 2 = Read file
//+------------------------------------------------------------------+ //| Чтение файла -1 0 1 2.mq4 | //+------------------------------------------------------------------+ //+------------------------------------------------------------------+ //| Инициализация - установка интервала таймера | //+------------------------------------------------------------------+ void OnInit() { EventSetTimer(1); } //+------------------------------------------------------------------+ //| Деинициализация - удаление метки | //+------------------------------------------------------------------+ void OnDeinit(const int Зачем) { ObjectDelete("Семафор"); } //+------------------------------------------------------------------+ //| По таймеру каждую секунду | //+------------------------------------------------------------------+ void OnTimer() { int x=0; ObjectCreate("Семафор",OBJ_LABEL,0,0,0); ObjectCreate("Семафор", OBJ_LABEL, 0, 0, 0); // Создание ObjectSet("Семафор", OBJPROP_CORNER, 2); // В правый нижний угол ObjectSet("Семафор", OBJPROP_XDISTANCE, 0); // Координата X ObjectSet("Семафор", OBJPROP_YDISTANCE, 40); // Координата Y ObjectSetText("Семафор","",20,"Arial",Yellow); ChartRedraw(0); Sleep(500); int handle = FileOpen("123.txt", FILE_BIN | FILE_READ); // Получаем НОМЕР файла в ОС if(handle == -1) // Если производится запись, файл занят, будет ошибка { ObjectSetText("Семафор","Ошибка",20,"Arial",Salmon); ChartRedraw(0); return; } x = FileReadInteger(handle,4); // Получаем СОДЕРЖИМОЕ файла ObjectSetText("Семафор",(string)x+" Прочитал",20,"Arial",DeepSkyBlue); ChartRedraw(0); FileClose(handle); }Hi all, could you advise me please, I wrote an EA about a year ago, it was working fine. I have not used it all this time. I do not know what to do with it, I just do not know what to do with it. Can it be because I have changed Build? I am currently using the Build 1090.
It's quite possible, there have been a lot of innovations. Start by checking for compilation errors. With #PropertyStrict directive.
There may well have been a lot of innovations. Start by checking for compilation errors. With the #PropertyStrict directive.
There is no such directive.
There is:
There may well have been a lot of innovations. Start by checking for compilation errors. With the #PropertyStrict directive.
There is no such directive.
There is:
But I can't open the EA file which is on my computer with ex4 extension, but there is no such file through MetaEditor. Please tell me what is the reason.