我想要使用MODI到OCR窗口的程序。它工作正常的我抢编程用win32互操作这样的画面：

I'm trying to use MODI to OCR a window's program. It works fine for screenshots I grab programmatically using win32 interop like this:

public string SaveScreenShotToFile()
{
    RECT rc;
    GetWindowRect(_hWnd, out rc);

    int width = rc.right - rc.left;
    int height = rc.bottom - rc.top;

    Bitmap bmp = new Bitmap(width, height);
    Graphics gfxBmp = Graphics.FromImage(bmp);
    IntPtr hdcBitmap = gfxBmp.GetHdc();

    PrintWindow(_hWnd, hdcBitmap, 0);

    gfxBmp.ReleaseHdc(hdcBitmap);
    gfxBmp.Dispose();

    string fileName = @"c:\temp\screenshots\" + Guid.NewGuid().ToString() + ".bmp";
    bmp.Save(fileName);
    return fileName;
}

此图像，然后保存为一个文件，跑过MODI像这样的：

This image is then saved to a file and ran through MODI like this:

    private string GetTextFromImage(string fileName)
    {

        MODI.Document doc = new MODI.DocumentClass();
        doc.Create(fileName);
        doc.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);
        MODI.Image img = (MODI.Image)doc.Images[0];
        MODI.Layout layout = img.Layout;

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < layout.Words.Count; i++)
        {
            MODI.Word word = (MODI.Word)layout.Words[i];
            sb.Append(word.Text);
            sb.Append(" ");
        }

        if (sb.Length > 1)
            sb.Length--;

        return sb.ToString();
    }

这部分工作正常，但是，我不想OCR，整个的屏幕截图，只是它的部分。我尝试裁剪图像编程方式是这样的：

This part works fine, however, I don't want to OCR the entire screenshot, just portions of it. I try cropping the image programmatically like this:

    private string SaveToCroppedImage(Bitmap original)
    {
        Bitmap result = original.Clone(new Rectangle(0, 0, 250, 250), original.PixelFormat);
        var fileName = "c:\\" + Guid.NewGuid().ToString() + ".bmp";
        result.Save(fileName, original.RawFormat);

        return fileName;
    }

然后OCRing这个更小的图像，但是MODI抛出一个异常; 'OCR运行错误'，错误code是-959967087。

and then OCRing this smaller image, however MODI throws an exception; 'OCR running error', the error code is -959967087.

为什么MOD​​I处理原始位图，但不是缩小版从什么时间？

Why can MODI handle the original bitmap but not the smaller version taken from it?

推荐答案

看起来好像答案是在给MODI一个更大的画布。我也试图采取控制和OCR它的屏幕截图，并碰到了同样的问题。最后，我采取了控制的图像，复制图像到一个更大的位图，并进行OCR较大的位图。

Looks as though the answer is in giving MODI a bigger canvas. I was also trying to take a screenshot of a control and OCR it and ran into the same problem. In the end I took the image of the control, copied the image into a larger bitmap and OCRed the larger bitmap.

另一个问题，我发现的是，你必须有一个正确的扩展图像文件。换句话说，的.tmp不剪

Another issue I found was that you must have a proper extension for your image file. In other words, .tmp doesn't cut it.

我一直在创造我的OCR方法，它看起来是这样的（我直接处理图像对象）内的大源的工作：

I kept the work of creating a larger source inside my OCR method, which looks something like this (I deal directly with Image objects):

public static string ExtractText(this Image image)
{
    var tmpFile = Path.GetTempFileName();
    string text;
    try
    {
        var bmp = new Bitmap(Math.Max(image.Width, 1024), Math.Max(image.Height, 768));
        var gfxResize = Graphics.FromImage(bmp);
        gfxResize.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height));
        bmp.Save(tmpFile + ".bmp", ImageFormat.Bmp);
        var doc = new MODI.Document();
        doc.Create(tmpFile + ".bmp");
        doc.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true);
        var img = (MODI.Image)doc.Images[0];
        var layout = img.Layout;
        text = layout.Text;
    }
    finally
    {
        File.Delete(tmpFile);
        File.Delete(tmpFile + ".bmp");
    }

    return text;
}

我不知道的最小尺寸是什么，但它看起来好像1024×768的伎俩。

I'm not sure exactly what the minimum size is, but it appears as though 1024 x 768 does the trick.