关键字参考

Null

Keyword value to use in function call.

    $var = Null

参数

None.

注意/说明

Use this keyword to trigger specific operations of functions that accept it as parameter.
Null evaluates only to Null, still in mathematical operations this keyword has value of 0, and as string it has no value (empty string).
COM method will receive Null as VT_NULL VARIANT. DllCall's wstr and str types will be set to NULL (pointers).

相关

IsKeyWord, Default

示例/演示


; Message box with an "错误" title.
DllCall("user32.dll", "int", "MessageBoxW", "hwnd", 0, "wstr", "Some text", "wstr", Null, "dword", 0)