MQL4 Reference 
File functions FileOpenHistory
| int FileOpenHistory( |
string filename, int mode, int delimiter=';') |
Opens file in the current history directory (terminal_directory\history\server_name) or in its subfolders. Returns the file handle
for the opened file. If the function fails, the returned value is -1. To get the detailed error information, call the GetLastError() function.
Notes: Client terminal can connect to servers of different brokerage companies. History data (HST files) for each brokerage company are stored in the corresponding
subfolder of the terminal_directory\history folder.
The function can be useful to form own history data for a non-standard symbol and/or period. The file formed in the history folder can be opened offline,
not data pumping is needed to chart it.
Parameters:
| filename |
- |
Filename. |
| mode |
- |
Opening mode. Can be one or combination of values: FILE_BIN, FILE_CSV, FILE_READ, FILE_WRITE. |
| delimiter |
- |
Delimiter for csv files. By default, the ';' symbol will be passed. |
Sample:
int handle=FileOpenHistory("USDX240.HST",FILE_BIN|FILE_WRITE);
if(handle<1)
{
Print("Cannot create file USDX240.HST");
return(false);
}
// work with file
// ...
FileClose(handle);
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