tessnet 的 C# .net 包装器

发布于 2024-10-16 13:15:39 字数 415 浏览 8 评论 0原文

我尝试为 tessnet OCR 库编写包装器。我收到一条错误消息“无法封送‘返回值’：无法封送通用类型。”对于此代码部分，

List<Word> k = OCRWrapper.DoOCR(new Bitmap(@"C:\Data\pdf2image\auto.png"), new Rectangle(0, 0, 55, 27));

我的包装类

class OCRWrapper
{
    [DllImport("TrueMarble.dll")]
    public static extern List<Word> DoOCR(Bitmap b, Rectangle rec);
}

请帮助我，任何人都可以指导我编写此代码

谢谢！

原文

I try to write wrapper for tessnet OCR library. I am getting an error saying "Cannot marshal 'return value': Generic types cannot be marshaled." for this code section

List<Word> k = OCRWrapper.DoOCR(new Bitmap(@"C:\Data\pdf2image\auto.png"), new Rectangle(0, 0, 55, 27));

My wrapper class is

class OCRWrapper
{
    [DllImport("TrueMarble.dll")]
    public static extern List<Word> DoOCR(Bitmap b, Rectangle rec);
}

please help me, can any one guide me to write this code

Thanx!

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

纸伞微斜 2024-10-23 13:15:39

你走错了路，Tessnet 已经是 Tesseract 的托管类包装器。您不使用 [DllImport]，只需添加对程序集的引用并直接使用类。示例代码和程序集下载位于此处。

Bitmap image = new Bitmap("eurotext.tif");
tessnet2.Tesseract ocr = new tessnet2.Tesseract();
ocr.SetVariable("tessedit_char_whitelist", "0123456789"); // If digit only
ocr.Init(@"c:\temp", "fra", false); // To use correct tessdata

List<tessnet2.Word> result = ocr.DoOCR(image, Rectangle.Empty);
foreach (tessnet2.Word word in result)
    Console.WriteLine("{0} : {1}", word.Confidence, word.Text);

You are on the wrong track with this, Tessnet already is a managed class wrapper around Tesseract. You don't use [DllImport], just add a reference to the assembly and use the classes directly. Sample code and assembly download is available here.

Bitmap image = new Bitmap("eurotext.tif");
tessnet2.Tesseract ocr = new tessnet2.Tesseract();
ocr.SetVariable("tessedit_char_whitelist", "0123456789"); // If digit only
ocr.Init(@"c:\temp", "fra", false); // To use correct tessdata

List<tessnet2.Word> result = ocr.DoOCR(image, Rectangle.Empty);
foreach (tessnet2.Word word in result)
    Console.WriteLine("{0} : {1}", word.Confidence, word.Text);

回复收藏 0 原文