int _LastError

int _LastError

The _LastError variable contains code of the last error, that occurred during the mql4-program run. Its value can be reset to zero by ResetLastError().

To obtain the code of the last error, you may also use the GetLastError() function.

 GetLastError()
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学习MT4函数int _LastError

学习MT4函数int _LastError

函数在这个里面  https://docs.mql4.com/cn/function_indices
常量在这里 https://docs.mql4.com/cn/constant_indices
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int _LastError怎么样