Function
Retrieves the error message.
Format
error_string = modbus_strerror( errnum )
Parameters
errnum [ VB.NET： Integer ] [ C, C++： int ] [ C#： int ] [ Python： ctypes.c_int ]
Specify errnum.
Return values
error_string [ VB.NET： IntPtr ] [ C, C++： char * ] [ C#： string ] [ Python： ctypes.c_char_p ]
If the function succeeds, the error message corresponding to errnum is returned.
Remarks
The error message corresponding to the error number specified by errnum can be retrieved.
Errnum can be obtained with the modbus_read_errno function.
By using this function, in addition to what is defined in the OS, the error number message defined in libmodbus can also be retrieved.
Example
The error content corresponding to errno is stored in ErrorString.
VB.NET |
Dim error_string As String error_string = modbus_strerror(errno)
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C, C++ |
char error_string[256]; error_string = modbus_strerror(errno);
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C# |
string error_string; error_string = modbus.StrError(errno);
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Python |
err_str = ctypes.create_string_buffer(256) err_str.value = modbus.modbus_strerror(errno)
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