Perform PDF conversion

# wkhtmltox\PDF\Converter::convert

(wkhtmltox >= 0.1.0)

wkhtmltox\PDF\Converter::convert — Perform PDF conversion

### 说明

public function wkhtmltox\PDF\Converter::convert(): ?string

Performs conversion of all previously added Objects

### 参数

此函数没有参数。

### 返回值

Where the return value is used, it will be populated with the contents of the conversion buffer

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