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multicharts关键词GetAppInfo
**** Hidden Message *****[/size] [code]GetAppInfo(aiBarSpacing)[/code]—— 返回目前图表上的K棒宽度 [code]GetAppInfo(aiCalcReason) [/code]
返回重新计算的原因 。
GetAppInfo返回初始化计算的原因:
0 (CalcReason_default) - 默认当新的bar/tick出现时，计算会初始化
1 (CalcReason_mouseLClick) - 鼠标在图表上左击后，计算会初始化
2 (CalcReason_mouseRClick) - 鼠标在图表上右击后，计算会初始化
3 (CalcReason_timer) - 在RecalcLastBarAfter期限超时后，计算会初始化
4 (CalcReason_MPChange) - 在商品的图表部位即marketposition变动后，计算会初始化
5 (CalcReason_OrderFilled) - 在委托单成交后，计算会初始化(仅用于信号) RecalcLastBarAfter
[table]
[tr][td]
超过指定时间，则初始化计算。指定时间为秒。 [/td][/tr]
[/table]
[table]
[tr][td][b]用法[/b]
RecalcLastBarAfter([i]Timeout[/i])
参数说明: [i]Timeout[/i] —— 秒数 （时间） [/td][/tr]
[/table]
[table]
[tr][td][b]范例[/b]
RecalcLastBarAfter(60) 自上次计算后如果超时1分钟的话，则启动新的脚本计算。 [/td][/tr]
[/table] 实例：
[code]switch (getappinfo(aicalcreason)) begin
case CalcReason_MouseLClick : if MouseClickCtrlPressed then begin
var: var0(0), var1(0);
repeat
if 0 = var0 then begin
var0 = MouseClickDateTime;
break;
end;
until(false);
end;
end;
var1 = datetime2eltime(var0);
print("Time of the Bar = ", var1);[/code]
Will return the time of the bar after left click on it pressing Ctrl button on the keyboard.左键单击键盘上的Ctrl按钮后，将返回该条的时间。 实例：
Using GetAppInfo for Chart Window information
The example below uses the Print keyword to print information about the current Chart Window to the PowerLanguage Editor output log:
[code]// Example: Getting data about the chart window using GetAppInfo
if LastBarOnChart_s = True then begin
Print("The leftmost date on this chart is ", FormatDate("MM/dd/yyyy", GetAppInfo(aiLeftDispDateTime)),
", and the rightmost date on this chart is ", FormatDate("MM/dd/yyyy", GetAppInfo(aiRightDispDateTime)));
Print(NewLine,
"The leftmost bar closes at ", FormatTime("HH:mm:ss", GetAppInfo(aiLeftDispDateTime)),
" and the rightmost bar closes at ", FormatTime("HH:mm:ss", GetAppInfo(aiRightDispDateTime)) );
Print(NewLine,
"The highest price on the Y axis (price scale) is ", NumToStr( GetAppInfo(aiHighestDispValue), 0),
" and the lowest price on the same axis is ", NumToStr( GetAppInfo(aiLowestDispValue), 0));
end;[/code]
This would give an output similar to:
[code]The leftmost date on this chart is 01/20/2012, and the rightmost date on this chart is 01/20/2012
The leftmost bar closes at 12:31:16 and the rightmost bar closes at 21:56:15
The highest price on the Y axis (price scale) is 2438 and the lowest price on the same axis is 2411[/code] 实例：
使用GetAppInfo监视ATS
在下面的简化示例中，GetAppInfo（aiStrategyAuto）用于监视自动交易策略的状态。如果ATS关闭，则会发出声音警报。
[code]// Strategy that gets turned off.
Variables:
IntraBarPersist PrevATSStatus(0), // Holds the status of the ATS at the previous update
atsStatus(0); // Holds the current ATS status
if (LastBarOnChart_s = True) then begin
atsStatus = GetAppInfo(aiStrategyAuto);
// If the current ATS Status is different from the previous, and the previous
// status was ON, give an sound alert.
if (atsStatus <> PrevATSStatus) and (PrevATSStatus = 1) then begin
PlaySound("C:\Temp\atsTurnedOff.wav");
end;
PrevATSStatus = atsStatus;
RecalcLastBarAfter(15); // Update every 15 seconds, even if the data feed stops updating
end;[/code]
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