MetaTrader 4 Script | Get message of Popup Alert MT4 using 📈 MT4 & MT5 Downloads

MetaTrader Experts, Indicators, Scripts and Libraries

this is small script using external DLL "user32.dll".

1. Import Dll and its functions

#define WM_GETTEXTLENGTH 0xE  #define WM_GETTEXT 0xD      #import "user32.dll"     int FindWindowW(string lpClassName, string lpWindowName);     int FindWindowExW(int hWnd1, int hWnd2, string lpsz1, string lpsz2);     int SendMessageA(int hwnd, int wMsg, int wParam, int lParam);     int SendMessageA(int hwnd, int wMsg, int wParam, char &lParam[]); //Edit lParam to receive value return  #import  //+------

2 Get Handle of Alert Dialog (parent window)

using FindWindowW to specific parent window handle

   int Hwnd = 0; //handle of parent window     int CHwnd = 0; //handle of textbox          Hwnd = FindWindowW("#32770", "Alert");//replace FindWindowA to FindWindowW for mql4

3. Get Handle of Textbox (or label) in Dialog (child window)

using FindWindowExW to specifit child window handle

   //Get handle of textbox in Dialog     CHwnd = FindWindowExW(Hwnd, 0, "Edit", NULL);//Find All control have class name is "Edit"

3. Get Content of message from textbox

3.1 Need to specify the length of the string:

   //Get content of Message in textbox     //Get length of message string     int textLength = SendMessageA(CHwnd, WM_GETTEXTLENGTH, 0, 0);

3.2 Get content

   string contentMsg = "";     char ch[540];     for(int i = 0; i < ArraySize(ch); i++) ch[i] = 0x000;          ArrayInitialize(ch, 0x000);          int length = SendMessageA(CHwnd, WM_GETTEXT, textLength + 1, ch);          for(int i = 0; i < length; i++) contentMsg += CharToString(ch[i]);          Print(__FUNCTION__, "--> Content Message = "+ contentMsg);