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了解如何在Mac OS上安装MetaTrader
龙飞
86
龙飞 2007.05.08 04:29 


这个函数是用来得出当前K线周期倍数的周期数据的,比如说放在1H里 extern int

PeriodMultiplier = 2; // new period multiplier factor 时可以得出2H的离线数据,可是加

到窗口中,为了获取不同周期的图,比如3M,8M,2H,这个指标加多了 加多个周期,关闭软件,再次

打开会CPU100%,内存爆涨,出现内存溢出。有什么办法可以解决这个问题,谢谢!

指标原码如下:

//+------------------------------------------------------------------+
//| CustomPeriod. mq4|
//| Copyright ?2005, MetaQuotes Software Corp. |
//| http://www.metaquotes.net |
//| Modified by wfy05@talkforex based on Period_Converter|
//| http://www.talkforex.com |
//+------------------------------------------------------------------+
#property copyright "wfy05@talkforex.com"
#property link "https://www.mql4.com/codebase/indicators/277/"
#property indicator_chart_window
#property show_inputs

#include <WinUser32.mqh>

/*
Readme:

I. Features:
This is an improved version of period converter for MT4 based on the
MT4's default period converter by metaquotes.
The default period converter script do not support real-time refreshing,
and consume lots of CPU (50%-9x%) making the whole system slow.
Also, the default one is a script which do not save when you exit MT4,
so you have to apply every converter script again after restarting, quite
annoying.

This one fixed all above problems:
1. Real-time updating or custom interval millisecond level updating.
2. Low CPU cost, average 5%-10% or less.
3. Works as an indicator, so can be saved and reloaded during restart.
4. There is no one converter per chart limitation as it is not script
any more, you can only use one window as source to generate as many
new timeframe chart as possible.
5. Auto updating if there is new history block loaded.

II. How to use:
Copy the mq4 file to your MT4 indicators folder (experts\indicators)
to install it as an indicator, NOT script. then in the custom indicator
list, attach period_converter_opt to the chart you want.
It support 4 parameters:
PeriodMultiplier: new period multiplier factor, default is 2
UpdateInterval: update interval in milliseconds,
zero means update real-time. default is zero.
Enabled: You can disable it without remove it with this option.

Other parameters are comments or for debugging, it is safe to ignore them.

Also Make sure you have Allow Dll imports option checked in common tab or
it won't work

After that, File->Open Offline to open the generated offline data. then
the offline data will be updated automatically.

As long as you keep the source chart open and the converter indicator
running, the generated chart including indicators inside will always
be updated. also you can close the generated chart and open again
later from File->Open Offline without problem.

If you want to quit MT4, you can leave those offline chart as other
normal online charts. when you start MT4 next time, those charts will
also be loaded and updated.


III. Notes:
1. Do NOT uncheck the "offline chart" option in offline chart common properties.
or after MT4 restart, it will treat that chart as online chart and request
the data from server, resulting empty chart window.
2. You can attach more than one converter to same window with different
PeriodMultiplier, e.g: you can attach 3 converter with
PeriodMultiplier = 2, 4, 10 to M1 to generate M2, M4, M10 at the same time.
It is even ok to use the M1 chart to generate Hourly chart like H2, which
only cost a few more CPU resource during initial conversion. but usually
most server don't have much data for those short period. resulting the
generated data isn't long enough for long period. so it is suggested
to use Hourly/Daily charts as source when needed.
3. The real-time updating mode updates quotes as fast as possible, but as
this is done via script, and MT will skip calling start() function when
your PC is busy and lots of quotes income. anyway, this seldom happen,
and you can at least get 10 updates each seconds which is much more
than enough.
4. The offline chart don't have a bid line showing in chart, but all data
in the chart including the indicators is still being updated,
so don't worry. you can show the bid line by unclick the "offline chart"
option in chart properties. but which don't helps much and if you forget
to check "offline chart" option before exit. it will cause errors and
become empty on next startup. you have to close the window and open
again from File->Open offline, which don't worth the trouble.

IV. History:
2006.02.16 1.5 Added TimeShift option, can be used to shift hour timeframe
to generate daily timeframe when your timezone is different
from the server, default is zero.
2005.12.24 1.4 faster to detect if data changed by removing float point
operations, added support to output CSV file in real time.
OutputCSVFile = 0 means no CSV.
OutputCSVFile = 1 means CSV + HST
OutputCSVFile = 2 CSV only, no HST .
(useful if you want to generate CSV for builtin periods)
CSV Filename will be the same as HST file except the extension.
added safe checking for PeriodMultiplier.
2005.12.04 1.3 Fixed missing data when there is large amount of data
loaded in several blocks, and support auto updating
when new history is loaded.
2005.11.29 1.2 Additional fix for missing data and server changing.
2005.11.29 1.1 Fixed missing partial data after restart.
Reinitialize after changing server or data corrupted.
2005.11.28 1.0 Initial release
*/


extern double Version = 1.5; // code version
extern string BuildInfo = "2006.02.16 by wfy05@talkforex.com";
extern int PeriodMultiplier = 2; // new period multiplier factor
extern int OutputCSVFile = 0; // also output CSV file?
extern int TimeShift = 0; // time shift value
extern int UpdateInterval = 0; // update interval in milliseconds, zero means

update real-time.
extern bool Enabled = true;
extern bool Debug = false;

int FileHandle = -1;
int CSVHandle = -1;
int NewPeriod = 0;
int NewPeriodOutput = 0;

#define OUTPUT_HST_ONLY 0
#define OUTPUT_CSV_HST 1
#define OUTPUT_CSV_ONLY 2

#define CHART_CMD_UPDATE_DATA 33324

void DebugMsg(string msg)
{
if (Debug) Alert(msg);
}

int init()
{
//safe checking for PeriodMultiplier.
if (PeriodMultiplier <= 1) {
//only output CSV file
PeriodMultiplier = 1;
OutputCSVFile = 2;
}
NewPeriod = Period() * PeriodMultiplier;
if (OpenHistoryFile() < 0) return (-1);
WriteHistoryHeader();
UpdateHistoryFile(Bars-1, true);
UpdateChartWindow();
return (0);
}

void deinit()
{
//Close file handle
if(FileHandle >= 0) {
FileClose(FileHandle);
FileHandle = -1;
}
if (CSVHandle >= 0) {
FileClose(CSVHandle);
CSVHandle = -1;
}
}


int OpenHistoryFile()
{
string name;

name = Symbol() + NewPeriod;
NewPeriodOutput = NewPeriod;
if (OutputCSVFile != OUTPUT_CSV_ONLY) {
if (NewPeriod == 1440) {
NewPeriodOutput = NewPeriod+1;
name = Symbol() + NewPeriodOutput;
}
FileHandle = FileOpenHistory(name + ".hst", FILE_BIN|FILE_WRITE);
if (FileHandle < 0) return(-1);
}
if (OutputCSVFile != OUTPUT_HST_ONLY) {
CSVHandle = FileOpen(name + ".csv", FILE_CSV|FILE_WRITE, ',');
if (CSVHandle < 0) return(-1);
}
return (0);
}

int WriteHistoryHeader()
{
string c_copyright;
int i_digits = Digits;
int i_unused[13] = {0};
int version = 400;

if (FileHandle < 0) return (-1);
c_copyright = "(C)opyright 2003, MetaQuotes Software Corp.";
FileWriteInteger(FileHandle, version, LONG_VALUE);
FileWriteString(FileHandle, c_copyright, 64);
FileWriteString(FileHandle, Symbol(), 12);
FileWriteInteger(FileHandle, NewPeriodOutput, LONG_VALUE);
FileWriteInteger(FileHandle, i_digits, LONG_VALUE);
FileWriteInteger(FileHandle, 0, LONG_VALUE); //timesign
FileWriteInteger(FileHandle, 0, LONG_VALUE); //last_sync
FileWriteArray(FileHandle, i_unused, 0, ArraySize(i_unused));
return (0);
}


static double d_open, d_low, d_high, d_close, d_volume;
static int i_time;

void WriteHistoryData()
{
if (FileHandle >= 0) {
FileWriteInteger(FileHandle, i_time, LONG_VALUE);
FileWriteDouble(FileHandle, d_open, DOUBLE_VALUE);
FileWriteDouble(FileHandle, d_low, DOUBLE_VALUE);
FileWriteDouble(FileHandle, d_high, DOUBLE_VALUE);
FileWriteDouble(FileHandle, d_close, DOUBLE_VALUE);
FileWriteDouble(FileHandle, d_volume, DOUBLE_VALUE);
}
if (CSVHandle >= 0) {
int i_digits = Digits;

FileWrite(CSVHandle,
TimeToStr(i_time, TIME_DATE),
TimeToStr(i_time, TIME_MINUTES),
DoubleToStr(d_open, i_digits),
DoubleToStr(d_high, i_digits),
DoubleToStr(d_low, i_digits),
DoubleToStr(d_close, i_digits),
d_volume);
}
}

int UpdateHistoryFile(int start_pos, bool init = false)
{
static int last_fpos, csv_fpos;
int i, ps;
int shift;

// if (FileHandle < 0) return (-1);
// normalize open time
ps = NewPeriod * 60;
shift = Period() * 60 * TimeShift;
i_time = (Time[start_pos]-shift)/ps;
i_time *= ps;
if (init) {
//first time, init data
d_open = Open[start_pos];
d_low = Low[start_pos];
d_high = High[start_pos];
d_close = Close[start_pos];
d_volume = Volume[start_pos];
i = start_pos - 1;
if (FileHandle >= 0) last_fpos = FileTell(FileHandle);
if (CSVHandle >= 0) csv_fpos = FileTell(CSVHandle);
} else {
i = start_pos;
if (FileHandle >= 0) FileSeek(FileHandle, last_fpos, SEEK_SET);
if (CSVHandle >= 0) FileSeek(CSVHandle, csv_fpos, SEEK_SET);
}
if (i < 0) return (-1);

int cnt = 0;
int LastBarTime;
//processing bars
while (i >= 0) {
LastBarTime = Time[i]-shift;

//a new bar
if (LastBarTime >= i_time+ps) {
//write the bar data
WriteHistoryData();
cnt++;
i_time = LastBarTime/ps;
i_time *= ps;
d_open = Open[i];
d_low = Low[i];
d_high = High[i];
d_close = Close[i];
d_volume = Volume[i];
} else {
//no new bar
d_volume += Volume[i];
if (Low[i]<d_low) d_low = Low[i];
if (High[i]>d_high) d_high = High[i];
d_close = Close[i];
}
i--;
}

//record last_fpos before writing last bar.
if (FileHandle >= 0) last_fpos = FileTell(FileHandle);
if (CSVHandle >= 0) csv_fpos = FileTell(CSVHandle);

WriteHistoryData();
cnt++;
d_volume -= Volume[0];

//flush the data writen
if (FileHandle >= 0) FileFlush(FileHandle);
if (CSVHandle >= 0) FileFlush(CSVHandle);
return (cnt);
}

int UpdateChartWindow()
{
static int hwnd = 0;

if (FileHandle < 0) {
//no HST file opened, no need updating.
return (-1);
}
if(hwnd == 0) {
//trying to detect the chart window for updating
hwnd = WindowHandle(Symbol(), NewPeriod);
}
if(hwnd!= 0) {
if (IsDllsAllowed() == false) {
//DLL calls must be allowed
DebugMsg("Dll calls must be allowed");
return (-1);
}
if (PostMessageA(hwnd,WM_COMMAND,CHART_CMD_UPDATE_DATA, 0) == 0) {
//PostMessage failed, chart window closed
hwnd = 0;
} else {
//PostMessage succeed
return (0);
}
}
//window not found or PostMessage failed
return (-1);
}


/*
int PerfCheck(bool Start)
{
static int StartTime = 0;
static int Index = 0;

if (Start) {
StartTime = GetTickCount();
Index = 0;
return (StartTime);
}
Index++;
int diff = GetTickCount() - StartTime;
Alert("Time used [" + Index + "]: " + diff);
StartTime = GetTickCount();
return (diff);
}
*/

static int LastStartTime = 0;
static int LastEndTime = 0;
static int LastBarCount = 0;

int reinit()
{
deinit();
init();
LastStartTime = Time[Bars-1];
LastEndTime = Time[0];
LastBarCount = Bars;
}

bool IsDataChanged()
{
/*
static int LastBars = 0, LastTime = 0, LastVolume = 0;
static double LastOpen = 0, LastClose = 0, LastHigh = 0, LastLow = 0;

if (LastVolume != Volume[0] || LastBars != Bars || LastTime != Time[0]||
LastClose != Close[0] || LastHigh != High[0] || LastLow != Low[0] ||
LastOpen != Open[0]) {

LastBars = Bars;
LastVolume = Volume[0];
LastTime = Time[0];
LastClose = Close[0];
LastHigh = High[0];
LastLow = Low[0];
LastOpen = Open[0];
return (true);
}
return (false);
*/
/*
fast version without float point operation
*/
static int LastBars = 0, LastTime = 0, LastVolume = 0;
bool ret;

ret = false;
if (LastVolume != Volume[0]) {
LastVolume = Volume[0];
ret = true;
}
if (LastTime != Time[0]) {
LastTime = Time[0];
ret = true;
}
if (LastBars != Bars) {
LastBars = Bars;
ret = true;
}
return (ret);
}

int CheckNewData()
{
static string LastServer = "";

if (Bars < 2) {
//the data is not loaded yet.
DebugMsg("Data not loaded, only " + Bars + " Bars");
return (-1);
}

string serv = ServerAddress();
if (serv == "") {
//no server yet
DebugMsg("No server connected");
return (-1);
}

//server changed? check this and reinit to prevent wrong data while changing server.
if (LastServer != serv) {
DebugMsg("Server changed from " + LastServer + " to " + serv);
LastServer = serv;
reinit();
return (-1);
}

if (!IsDataChanged()) {
//return if no data changed to save resource
//DebugMsg("No data changed");
return (-1);
}

if (Time[Bars-1] != LastStartTime) {
DebugMsg("Start time changed, new history loaded or server changed");
reinit();
return (-1);
}

int i, cnt;

//try to find LastEndTime bar, which should be Time[0] or Time[1] usually,
//so the operation is fast
for (i = 0; i < Bars; i++) {
if (Time[i] <= LastEndTime) {
break;
}
}

if (i >= Bars || Time[i] != LastEndTime) {
DebugMsg("End time " + TimeToStr(LastEndTime) + " not found");
reinit();
return (-1);
}

cnt = Bars - i;
if (cnt != LastBarCount) {
DebugMsg("Data loaded, cnt is " + cnt + " LastBarCount is " + LastBarCount);
reinit();
return (-1);
}

//no new data loaded, return with LastEndTime position.
LastBarCount = Bars;
LastEndTime = Time[0];
return (i);
}

//+------------------------------------------------------------------+
//| program start function |
//+------------------------------------------------------------------+
int start()
{
static int last_time = 0;

if (!Enabled) return (0);

//always update or update only after certain interval
if (UpdateInterval != 0) {
int cur_time;

cur_time = GetTickCount();
if (MathAbs(cur_time - last_time) < UpdateInterval) {
return (0);
}
last_time = cur_time;
}

//if (Debug) PerfCheck(true);
int n = CheckNewData();
//if (Debug) PerfCheck(false);
if (n < 0) return (0);

//update history file with new data
UpdateHistoryFile(n);
//refresh chart window
UpdateChartWindow();
//if (Debug) PerfCheck(false);
return(0);
}

/
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