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公用函数 [Common Functions]
void Alert( ... )
弹出一个显示信息的警告窗口
:: 输入参数
... - 任意值，如有多个可用逗号分割
示例:
if(Close[0]>SignalLevel)
Alert("Close price coming ", Close[0],"!!!");
string ClientTerminalName()
返回客户终端名称
示例:
Print("Terminal name is ",ClientTerminalName());
string CompanyName()
返回公司名称
示例:
Print("Company name is ",CompanyName());
void Comment( ... )
显示信息在走势图左上角
:: 输入参数
... - 任意值，如有多个可用逗号分割
示例:
double free=AccountFreeMargin();
Comment("Account free margin is ",DoubleToStr(free,2),"\n","Current time is ",TimeToStr(CurTime()));
int GetLastError()
取最后错误在错误中的索引位置
示例:
int err;
int handle=FileOpen("somefile.dat", FILE_READ|FILE_BIN);
if(handle<1)
{
err=GetLastError();
Print("error(",err,"): ",ErrorDescription(err));
return(0);
}
int GetTickCount()
取时间标记，函数取回用毫秒标示的时间标记。
示例:
int start=GetTickCount();
// do some hard calculation...
Print("Calculation time is ", GetTickCount()-start, " milliseconds.");
void HideTestIndicators(bool hide)
使用此函数设置一个在Expert Advisor的开关，在测试完成之前指标不回显示在图表上。
:: 输入参数
hide - 是否隐藏 True或者False
示例:
HideTestIndicators(true);
bool IsConnected()
返回客户端是否已连接
示例:
if(!IsConnected())
{
Print("Connection is broken!");
return(0);
}
// Expert body that need opened connection
// ...
bool IsDemo()
返回是否是模拟账户
示例:
if(IsDemo()) Print("I am working on demo account");
else Print("I am working on real account");
bool IsDllsAllowed()
返回是否允许载入Dll文件
示例:
#import "user32.dll"
int MessageBoxA(int hWnd ,string szText, string szCaption,int nType);
...
...
if(IsDllsAllowed()==false)
{
Print("DLL call is not allowed. Experts cannot run.");
return(0);
}
// expert body that calls external DLL functions
MessageBoxA(0,"an message","Message",MB_OK);
bool IsLibrariesAllowed()
返回是否允许载入库文件
示例:
#import "somelibrary.ex4"
int somefunc();
...
...
if(IsLibrariesAllowed()==false)
{
Print("Library call is not allowed. Experts cannot run.");
return(0);
}
// expert body that calls external DLL functions
somefunc();
bool IsStopped()
返回是否处于停止状态
示例:
while(expr!=false)
{
if(IsStopped()==true) return(0);
// long time procesing cycle
// ...
}
bool IsTesting()
返回是否处于测试模式
示例:
if(IsTesting()) Print("I am testing now");
bool IsTradeAllowed()
返回是否允许交易
示例:
if(IsTradeAllowed()) Print("Trade allowed");
double MarketInfo( string symbol, int type)
返回市场当前情况
:: 输入参数
symbol - 通货代码
type - 返回结果的类型
示例:
double var;
var=MarketInfo("EURUSD",MODE_BID);
int MessageBox( string text=NULL, string caption=NULL, int flags=EMPTY)
弹出消息窗口，返回消息窗口的结果
:: 输入参数
text - 窗口显示的文字
caption - 窗口上显示的标题
flags - 窗口选项开关
示例:
#include
if(ObjectCreate("text_object", OBJ_TEXT, 0, D'2004.02.20 12:30', 1.0045)==false)
{
int ret=MessageBox("ObjectCreate() fails with code "+GetLastError()+"\nContinue?", "Question", MB_YESNO|MB_ICONQUESTION);
if(ret==IDNO) return(false);
}
// continue
int Period()
返回图表时间线的类型
示例:
Print(" eriod is ", Period());
void PlaySound( string filename)
播放音乐文件
:: 输入参数
filename - 音频文件名
示例:
if(IsDemo()) PlaySound("alert.wav");
void Print( ... )
将文本打印在结果窗口内
:: 输入参数
... - 任意值，复数用逗号分割
示例:
Print("Account free margin is ", AccountFreeMargin());
Print("Current time is ", TimeToStr(CurTime()));
double pi=3.141592653589793;
Print("I number is ", DoubleToStr(pi,8));
// Output: PI number is 3.14159265
// Array printing
for(int i=0;i<10;i++)
Print(Close);
bool RefreshRates()
返回数据是否已经被刷新过了
示例:
int ticket;
while(true)
{
ticket=OrderSend(Symbol(),OP_BUY,1.0,Ask,3,0,0,"expert comment",255,0,CLR_NONE);
if(ticket<=0)
{
int error=GetLastError();
if(error==134) break; // not enough money
if(error==135) RefreshRates(); // prices changed
break;
}
else { OrderPrint(); break; }
//---- 10 seconds wait
Sleep(10000);
}
void SendMail( string subject, string some_text)
发送邮件到指定信箱，需要到菜单 Tools -> Options -> Email 中将邮件打开.
:: 输入参数
subject - 邮件标题
some_text - 邮件内容
示例:
double lastclose=Close[0];
if(lastclose<MY_SIGNAL)
SendMail("from your expert", "rice dropped down to "+DoubleToStr(lastclose));
string ServerAddress()
返回服务器地址
示例:
Print("Server address is ", ServerAddress());
void Sleep( int milliseconds)
设置线程暂停时间
:: 输入参数
milliseconds - 暂停时间 1000 = 1秒
示例:
Sleep(5);
void SpeechText( string text, int lang_mode=SPEECH_ENGLISH)
使用Speech进行语音输出
:: 输入参数
text - 阅读的文字
lang_mode - 语音模式 SPEECH_ENGLISH (默认的) 或 SPEECH_NATIVE
示例:
double lastclose=Close[0];
SpeechText("rice dropped down to "+DoubleToStr(lastclose));
string Symbol()
返回当前当前通货的名称
示例:
int total=OrdersTotal();
for(int pos=0;pos<TOTALOS++)
{
// check selection result becouse order may be closed or deleted at this time!
if(OrderSelect(pos, SELECT_BY_POS)==false) continue;
if(OrderType()>OP_SELL || OrderSymbol()!=Symbol()) continue;
// do some orders processing...
}
int UninitializeReason()
取得程序末初始化的理由
示例:
// this is example
int deinit()
{
switch(UninitializeReason())
{
case REASON_CHARTCLOSE:
case REASON_REMOVE: CleanUp(); break; // clean up and free all expert's resources.
case REASON_RECOMPILE:
case REASON_CHARTCHANGE:
case REASON_PARAMETERS:
case REASON_ACCOUNT: StoreData(); break; // prepare to restart
}
//...
}
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