Struct ExtraParameters 

#[repr(C)]
pub struct ExtraParameters {
    pub exec_flags: *mut ExecFlags,
    pub execute_code_segment: Option<unsafe extern "system" fn(c_int, Hwnd) -> c_int>,
    pub validate_filename: Option<unsafe extern "system" fn(*mut Tchar)>,
    pub register_plugin_callback: Option<unsafe extern "system" fn(Hmodule, NsisPluginCallback) -> c_int>,
}

The extra_parameters block, fifth argument to every plug-in export.

Fields

exec_flags: *mut ExecFlags

Pointer to the installer’s live ExecFlags.

execute_code_segment: Option<unsafe extern "system" fn(c_int, Hwnd) -> c_int>

Runs a code segment in the installer. Honest passthrough, no wrapper.

validate_filename: Option<unsafe extern "system" fn(*mut Tchar)>

Replaces invalid filename characters in place.

register_plugin_callback: Option<unsafe extern "system" fn(Hmodule, NsisPluginCallback) -> c_int>

Registers an unload callback. Returns 0 on success, 1 if already registered, and < 0 on error.