mql4写一个输入框开单的时候将 输入框的值加上货币对名称写入订单备注中。再写一个根据输入框的前缀关闭的按钮。

以下是一个使用MQL4编写的示例代码，实现了一个带有输入框和按钮的简单界面。在开单时，会将输入框的值加上货币对名称写入订单备注中。同时，通过点击按钮可以根据输入框的前缀关闭。

//+------------------------------------------------------------------+
//|                                                   InputBoxDemo.mq4 |
//|                 Copyright 2022, MetaQuotes Software Corp. |
//|                                              https://mql4.com   |
//+------------------------------------------------------------------+
#property strict

input string PairName = "EURUSD";
input string Prefix = "CLOSE";

string inputText = "";
bool buttonClicked = false;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
{
    // 创建输入框
    int inputBox = InputBox("输入框", "请输入值", inputText, 100, 0, 0);
    if (inputBox == 2) {
        // 点击取消按钮，终止脚本
        return INIT_FAILED;
    }
    
    // 创建按钮
    int button = ButtonCreate("关闭订单", 0, 0);
    
    return INIT_SUCCEEDED;
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
void OnTick()
{
    if (buttonClicked) {
        CloseOrdersByPrefix();
        buttonClicked = false;
    }
}

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
    // 删除按钮
    ButtonDelete(0);
}

//+------------------------------------------------------------------+
//| Event handler function for button click                           |
//+------------------------------------------------------------------+
void OnButtonClick(const int button)
{
    if (button == 0) {
        buttonClicked = true;
    }
}

//+------------------------------------------------------------------+
//| Close orders by prefix                                           |
//+------------------------------------------------------------------+
void CloseOrdersByPrefix()
{
    int total = OrdersTotal();
    for (int i = total - 1; i >= 0; i--) {
        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES)) {
            string orderSymbol = OrderSymbol();
            if (StringFind(orderSymbol, Prefix, 0) == 0) {
                OrderClose(OrderTicket(), OrderLots(), OrderClosePrice(), 3, CLR_NONE);
            }
        }
    }
}

//+------------------------------------------------------------------+
//| Create a button                                                   |
//+------------------------------------------------------------------+
int ButtonCreate(string text, int x, int y)
{
    int button = EventChartCustom(EVENT_OBJECT_CREATE, 0, 0, 0, 0);
    if (button > 0) {
        EventChartCustom(EVENT_OBJECT_TYPE, button, OBJ_BUTTON, 0, 0);
        EventChartCustom(EVENT_OBJECT_XPOSITION, button, x, 0, 0);
        EventChartCustom(EVENT_OBJECT_YPOSITION, button, y, 0, 0);
        EventChartCustom(EVENT_OBJECT_CLICK, button, 1, 0, 0);
        EventChartCustom(EVENT_OBJECT_TOOLTIP, button, 1, 0, 0);
        EventChartCustom(EVENT_OBJECT_TEXT, button, 0, 0, text);
    }
    return button;
}

//+------------------------------------------------------------------+
//| Delete a button                                                   |
//+------------------------------------------------------------------+
void ButtonDelete(int button)
{
    EventChartCustom(EVENT_OBJECT_DELETE, button, 0, 0, 0);
}

//+------------------------------------------------------------------+
//| Create an input box                                               |
//+------------------------------------------------------------------+
int InputBox(string caption, string prompt, string& value, int x, int y, int flags)
{
    EventChartCustom(EVENT_OBJECT_CREATE, 0, 0, 0, 0);
    EventChartCustom(EVENT_OBJECT_TYPE, OBJ_EDIT, OBJ_EDIT, 0, 0);
    EventChartCustom(EVENT_OBJECT_XPOSITION, 0, x, 0, 0);
    EventChartCustom(EVENT_OBJECT_YPOSITION, 0, y, 0, 0);
    EventChartCustom(EVENT_OBJECT_XSIZE, 0, 150, 0, 0);
    EventChartCustom(EVENT_OBJECT_YSIZE, 0, 20, 0, 0);
    EventChartCustom(EVENT_OBJECT_TOOLTIP, 0, 1, 0, 0);
    EventChartCustom(EVENT_OBJECT_TEXT, 0, 0, 0, caption);
    EventChartCustom(EVENT_OBJECT_PROP, 0, 0, 0, flags);
    EventChartCustom(EVENT_OBJECT_PROP, 0, 1, 0, prompt);
    EventChartCustom(EVENT_OBJECT_PROP, 0, 2, 0, value);
    return EventChartCustom(EVENT_OBJECT_VALUE, 0, 0, 0, 0);
}

请注意，以上代码是一个简化的示例，可能需要根据您的实际需求进行修改和扩展