为各种文件调查添加水印
我被要求调查通过我们的应用程序打印时向文档添加水印的可行性。文件将由word、pdf 和cad 组成。
该应用程序的界面是vb6，带有大量的vc6 dll。
我可以看到几个可能的解决方案：
- 将所有文档转换为 PDF，添加水印，然后打印。
- 找到一个打印驱动程序，该驱动程序将在打印之前向所有文档添加水印并安装它，并在运行时重新启用它（如果它因任何原因被禁用）。
可以使用第 3 方套件（我们使用 Volo View Express 查看 CAD 文件），但由于该应用程序的生命周期已接近尾声，我们不想在其上花费太多。
有没有人有过上述经历？有什么问题会让我陷入困境吗？
I've been asked to investigate the feasibility of adding watermarks to documents when printed through our application. The documents will consist of word, pdf and cad.
The interface of the application is vb6 with a plethora of vc6 dll's.
I can see a couple of possible solutions:
- Convert all documents to PDF, add a watermark and then print.
- Find a print driver that will add a watermark to all documents prior to printing and install it and reenable it at runtime if it gets disabled for any reason.
3rd Party suites are possibility (we use Volo View Express for viewing CAD files) but since this application is nearing end-of-life we wouldn't want to spend too much on it.
Has anyone had any experience of the above? Any gotcha's that will bog me down?
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Tracker Software 拥有一组很好的 PDF api，可让您实施已有的解决方案记住。我经常使用他们的图像和 PDF 库，在 VB6 和 .NET 中都取得了很大的成功。单用户许可证并不昂贵（我猜这取决于您如何看待它），而且我发现支持也非常好。
Tracker Software has a good set of PDF api's that that will allow you to implement the solution you already have in mind. I've used their Image and PDF libraries quite a bit with a lot of success in both VB6 and .NET. Single user licenses are not expensive (depending on how you look at it I guess), and I've found support to be excellent as well.