98 lines
4.1 KiB
Markdown
98 lines
4.1 KiB
Markdown
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# FileWriteFloat
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The function writes the value of the float parameter to a bin-file, starting from the current position of the file pointer.
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```
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uint FileWriteFloat(
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int file_handle, // File handle
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float value // Value to be written
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);
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```
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Parameters
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file_handle
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[in] File descriptor returned by [FileOpen()](/en/docs/files/fileopen).
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value
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[in] The value of float type.
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Return Value
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If successful the function returns the number of bytes written (in this case [sizeof](/en/docs/basis/operations/other#sizeof)(float)=4). The file pointer is shifted by the same number of bytes.
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Example:
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```
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//+------------------------------------------------------------------+
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//| Demo_FileWriteFloat.mq5 |
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//| Copyright 2013, MetaQuotes Software Corp. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2013, MetaQuotes Software Corp."
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#property link "https://www.mql5.com"
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#property version "1.00"
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//--- show the window of input parameters when launching the script
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#property script_show_inputs
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//--- parameters for receiving data from the terminal
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input string InpSymbolName="EURUSD"; // currency pair
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input ENUM_TIMEFRAMES InpSymbolPeriod=PERIOD_M15; // time frame
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input datetime InpDateStart=D'2013.01.01 00:00'; // data copying start date
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//--- parameters for writing data to the file
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input string InpFileName="Close.bin"; // file name
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input string InpDirectoryName="Data"; // directory name
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//+------------------------------------------------------------------+
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//| Script program start function |
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//+------------------------------------------------------------------+
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void OnStart()
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{
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datetime date_finish=TimeCurrent();
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double close_buff[];
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datetime time_buff[];
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int size;
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//--- reset the error value
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ResetLastError();
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//--- copy the close price for each bar
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if(CopyClose(InpSymbolName,InpSymbolPeriod,InpDateStart,date_finish,close_buff)==-1)
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{
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PrintFormat("Failed to copy close price values. Error code = %d",GetLastError());
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return;
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}
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//--- copy the time for each bar
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if(CopyTime(InpSymbolName,InpSymbolPeriod,InpDateStart,date_finish,time_buff)==-1)
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{
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PrintFormat("Failed to copy the time values. Error code = %d",GetLastError());
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return;
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}
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//--- receive the buffer size
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size=ArraySize(close_buff);
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//--- open the file for writing the values (if the file is absent, it will be created automatically)
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ResetLastError();
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int file_handle=FileOpen(InpDirectoryName+"//"+InpFileName,FILE_READ|FILE_WRITE|FILE_BIN);
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if(file_handle!=INVALID_HANDLE)
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{
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PrintFormat("%s file is open for writing",InpFileName);
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PrintFormat("File path: %s\\Files\\",TerminalInfoString(TERMINAL_DATA_PATH));
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//--- write close prices' time and values to the file
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for(int i=0;i<size;i++)
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{
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FileWriteDouble(file_handle,(double)time_buff[i]);
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FileWriteFloat(file_handle,(float)close_buff[i]);
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}
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//--- close the file
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FileClose(file_handle);
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PrintFormat("Data is written, %s file is closed",InpFileName);
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}
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else
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PrintFormat("Failed to open %s file, Error code = %d",InpFileName,GetLastError());
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}
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```
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See also
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[Real types (double, float)](/en/docs/basis/types/double), [FileWriteDouble](/en/docs/files/filewritedouble)
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