Initialization of local variables to a nonzero value.

将局部变量初始化为非零值。

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The only convention prescribed is that 0 should be returned for success and a nonzero value for failure.

规定的唯一约定是返回0应该表示成功而返回非零值表示失败。

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Specifies whether the button is to be highlighted. A nonzero value highlights the button; a 0 value removes any highlighting.

指定按钮是否被加亮显示。非零值将加亮显示按钮，0将不加亮显示。

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