我有第三方控件允许签名捕获 . 我正在以base64字符串的形式从控件中捕获签名的图像 . 但我需要能够使用itextsharp将此图像标记为PDF文档，但无法将此base64字符串转换为可接受的格式（PNG） .
我需要使用itextsharp访问现有PDF文档的控件捕获的数据示例：
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1 回答
控制开发者提供了一种方法 . 一切都好 .