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How to disable the backspace key event.

i have create some objects on chart. but if i press the backspace button on keyboard. these objects will be deleted on chart. how can i disable this event . thanks

how to decrypt the "AES128" data in mql4 called by JAVA

used CryptEncode Base64 can be decode in JAVA. but i used AES128 encode the string "1234", key is "1234567812345678". then to hex, the result is: N0tfT8tiE0k+KDDzEOoRxA== but this result can not be decrypt in java. please help me~! the code is: string text="1234"; string