msg

Display an UTF-8 encoded message in the message window
     format - printf() style format string
     ...    - additional parameters if any
This function can be used to debug IDC scripts
The result of the stringification of the arguments
will be treated as an UTF-8 string.
Thread-safe function.

void msg(string format, ...);

// Print variables in the message window
// This function print text representation of all its arguments to the output window.
// This function can be used to debug IDC scripts

void print(...);

// Display a message in a message box
//      format - printf() style format string
//      ...    - additional parameters if any
// This function can be used to debug IDC scripts
// The user will be able to hide messages if they appear twice in a row on the screen

void warning(string format, ...);

// Display a fatal message in a message box and quit IDA
//      format - printf() style format string
//      ...    - additional parameters if any

void error(string format, ...);