| //+------------------------------------------------------------------+
|
| //| FilePipe.mqh |
|
| //| Copyright 2000-2025, MetaQuotes Ltd. |
|
| //| https://www.mql5.com |
|
| //+------------------------------------------------------------------+
|
| #include "File.mqh"
|
| //+------------------------------------------------------------------+
|
| //| Class CFilePipe |
|
| //| Purpose: Class of operations with binary files |
|
| //| Derives from class CFile |
|
| //+------------------------------------------------------------------+
|
| class CFilePipe : public CFile
|
| {
|
| public:
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| CFilePipe(void);
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| ~CFilePipe(void);
|
| //--- methods for working with files
|
| int Open(const string file_name,const int open_flags);
|
| //--- wait for incoming data
|
| bool WaitForRead(const ulong size);
|
| //--- methods for writing data
|
| template<typename T>
|
| uint WriteInteger(const T value);
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| uint WriteLong(const long value);
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| uint WriteFloat(const float value);
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| uint WriteDouble(const double value);
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| uint WriteString(const string value);
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| uint WriteString(const string value,const int size);
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| template<typename T>
|
| uint WriteArray(T &array[],const int start_item=0,const int items_count=WHOLE_ARRAY);
|
| template<typename T>
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| uint WriteStruct(T &data);
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| bool WriteObject(CObject *object);
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| template<typename T>
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| uint WriteEnum(const T value) { return(WriteInteger((int)value)); }
|
| //--- methods for reading data
|
| template<typename T>
|
| bool ReadInteger(T &value);
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| bool ReadLong(long &value);
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| bool ReadFloat(float &value);
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| bool ReadDouble(double &value);
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| bool ReadString(string &value);
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| bool ReadString(string &value,const int size);
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| template<typename T>
|
| uint ReadArray(T &array[],const int start_item=0,const int items_count=WHOLE_ARRAY);
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| template<typename T>
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| uint ReadStruct(T &data);
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| bool ReadObject(CObject *object);
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| template<typename T>
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| bool ReadEnum(T &value);
|
| };
|
| //+------------------------------------------------------------------+
|
| //| Constructor |
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| //+------------------------------------------------------------------+
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| CFilePipe::CFilePipe(void)
|
| {
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Destructor |
|
| //+------------------------------------------------------------------+
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| CFilePipe::~CFilePipe(void)
|
| {
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Opening a binary file |
|
| //+------------------------------------------------------------------+
|
| int CFilePipe::Open(const string file_name,const int open_flags)
|
| {
|
| return(CFile::Open(file_name,open_flags|FILE_BIN));
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Wait for incoming data |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::WaitForRead(const ulong size)
|
| {
|
| //--- check handle and stop flag
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| while(m_handle!=INVALID_HANDLE && !IsStopped())
|
| {
|
| //--- enought data?
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| if(FileSize(m_handle)>=size)
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| return(true);
|
| //--- wait a little
|
| Sleep(1);
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| }
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write a variable of integer types |
|
| //+------------------------------------------------------------------+
|
| template<typename T>
|
| uint CFilePipe::WriteInteger(const T value)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
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| return(FileWriteInteger(m_handle,value,sizeof(T)));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write a variable of long or ulong type |
|
| //+------------------------------------------------------------------+
|
| uint CFilePipe::WriteLong(const long value)
|
| {
|
| //--- check handle
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| if(m_handle!=INVALID_HANDLE)
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| return(FileWriteLong(m_handle,value));
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| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write a variable of float type |
|
| //+------------------------------------------------------------------+
|
| uint CFilePipe::WriteFloat(const float value)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
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| return(FileWriteFloat(m_handle,value));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write a variable of double type |
|
| //+------------------------------------------------------------------+
|
| uint CFilePipe::WriteDouble(const double value)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
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| return(FileWriteDouble(m_handle,value));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write a variable of string type |
|
| //+------------------------------------------------------------------+
|
| uint CFilePipe::WriteString(const string value)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
|
| {
|
| //--- size of string
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| int size=StringLen(value);
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| //--- write
|
| if(FileWriteInteger(m_handle,size)==sizeof(int))
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| return(FileWriteString(m_handle,value,size));
|
| }
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write a part of string |
|
| //+------------------------------------------------------------------+
|
| uint CFilePipe::WriteString(const string value,const int size)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
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| return(FileWriteString(m_handle,value,size));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write an array of variables of any type |
|
| //+------------------------------------------------------------------+
|
| template<typename T>
|
| uint CFilePipe::WriteArray(T &array[],const int start_item=0,const int items_count=WHOLE_ARRAY)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
|
| return(FileWriteArray(m_handle,array,start_item,items_count));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write an structure |
|
| //+------------------------------------------------------------------+
|
| template<typename T>
|
| uint CFilePipe::WriteStruct(T &data)
|
| {
|
| //--- check handle
|
| if(m_handle!=INVALID_HANDLE)
|
| return(FileWriteStruct(m_handle,data));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Write data of an instance of the CObject class |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::WriteObject(CObject *object)
|
| {
|
| //--- check handle & object
|
| if(m_handle!=INVALID_HANDLE)
|
| if(CheckPointer(object))
|
| return(object.Save(m_handle));
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read a variable of integer types |
|
| //+------------------------------------------------------------------+
|
| template<typename T>
|
| bool CFilePipe::ReadInteger(T &value)
|
| {
|
| //--- check for data
|
| if(WaitForRead(sizeof(T)))
|
| {
|
| ResetLastError();
|
| value=FileReadInteger(m_handle,sizeof(T));
|
| return(GetLastError()==0);
|
| }
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read a variable of long or ulong type |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::ReadLong(long &value)
|
| {
|
| //--- check handle
|
| if(WaitForRead(sizeof(long)))
|
| {
|
| ResetLastError();
|
| value=FileReadLong(m_handle);
|
| return(GetLastError()==0);
|
| }
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read a variable of float type |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::ReadFloat(float &value)
|
| {
|
| //--- check for data
|
| if(WaitForRead(sizeof(float)))
|
| {
|
| ResetLastError();
|
| value=FileReadFloat(m_handle);
|
| return(GetLastError()==0);
|
| }
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read a variable of double type |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::ReadDouble(double &value)
|
| {
|
| //--- check for data
|
| if(WaitForRead(sizeof(double)))
|
| {
|
| ResetLastError();
|
| value=FileReadDouble(m_handle);
|
| return(GetLastError()==0);
|
| }
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read a variable of string type |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::ReadString(string &value)
|
| {
|
| //--- check for data
|
| if(WaitForRead(sizeof(int)))
|
| {
|
| ResetLastError();
|
| int size=FileReadInteger(m_handle);
|
| if(GetLastError()==0)
|
| {
|
| //--- check for data
|
| if(WaitForRead(size))
|
| {
|
| value=FileReadString(m_handle,size);
|
| return(size==StringLen(value));
|
| }
|
| }
|
| }
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read a part of string |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::ReadString(string &value,const int size)
|
| {
|
| //--- check for data
|
| if(WaitForRead(size))
|
| {
|
| value=FileReadString(m_handle,size);
|
| return(size==StringLen(value));
|
| }
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read an array of variables of any type |
|
| //+------------------------------------------------------------------+
|
| template<typename T>
|
| uint CFilePipe::ReadArray(T &array[],const int start_item=0,const int items_count=WHOLE_ARRAY)
|
| {
|
| //--- calculate size
|
| uint size=ArraySize(array);
|
| if(items_count!=WHOLE_ARRAY) size=items_count;
|
| //--- check for data
|
| if(WaitForRead(size*sizeof(T)))
|
| return(FileReadArray(m_handle,array,start_item,items_count));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read an structure |
|
| //+------------------------------------------------------------------+
|
| template<typename T>
|
| uint CFilePipe::ReadStruct(T &data)
|
| {
|
| //--- check for data
|
| if(WaitForRead(sizeof(T)))
|
| return(FileReadStruct(m_handle,data));
|
| //--- failure
|
| return(0);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read data of an instance of the CObject class |
|
| //+------------------------------------------------------------------+
|
| bool CFilePipe::ReadObject(CObject *object)
|
| {
|
| //--- check for object & data
|
| if(CheckPointer(object))
|
| if(WaitForRead(sizeof(int))) // only 4 bytes!
|
| return(object.Load(m_handle));
|
| //--- failure
|
| return(false);
|
| }
|
| //+------------------------------------------------------------------+
|
| //| Read a variable of an enumeration type |
|
| //+------------------------------------------------------------------+
|
| template<typename T>
|
| bool CFilePipe::ReadEnum(T &value)
|
| {
|
| int val;
|
| if(!ReadInteger(val))
|
| return(false);
|
| //---
|
| value=(T)val;
|
| return(true);
|
| }
|
| //+------------------------------------------------------------------+
|
