IronBarcode與ZXing.NET的比較

要使用ZXing.NET庫，請在您的ASP.NET Core應用中使用NuGet Package Manager Console安裝以下兩個包：

1. ZXing.Net

Install-Package ZXing.Net

2. ZXing.Net.Bindings.CoreCompat.System.Drawing

Install-Package ZXing.Net.Bindings.CoreCompat.System.Drawing -Version 0.16.5-beta

或者，可以使用NuGet Package Manager在您的項目中安裝ZXing.NET。 要這樣做，請轉到工具 > NuGet包管理器 > 管理解決方案的NuGet包...，然後切換到"瀏覽"選項卡並搜索"ZXing.NET"。

ASP.NET Web應用程序

當您將IronBarcode類庫與.NET條碼閱讀器結合使用時，閱讀條碼或QR碼變得非常簡單。 在我們的第一個示例中，我們可以看到如何使用單行代碼來閱讀條碼。

待掃描的Code128條碼圖像與C#一起使用

我們可以獲取條碼的值、圖像、編碼類型和二進制數據(如有)，然後將其輸出到控制台。

using IronBarCode;
using System;

// Read a barcode or QR code from an image
BarcodeResult Result = BarcodeReader.QuicklyReadOneBarcode("GetStarted.png");
if (Result != null && Result.Text == "https://ironsoftware.com/csharp/barcode/")
{
    Console.WriteLine("GetStarted was a success.  Read Value: " + Result.Text);
}

using IronBarCode;
using System;

// Read a barcode or QR code from an image
BarcodeResult Result = BarcodeReader.QuicklyReadOneBarcode("GetStarted.png");
if (Result != null && Result.Text == "https://ironsoftware.com/csharp/barcode/")
{
    Console.WriteLine("GetStarted was a success.  Read Value: " + Result.Text);
}

閱讀PDF內的條碼

我們將看看如何在幾行代碼中閱讀掃描PDF文件並找到所有一維條碼。

如您所見，它和從單個文件中閱讀單個條碼非常相似，不過現在我們知道條碼是在哪一頁上發現的。

using IronBarCode;
using System;
using System.Drawing;

// Multiple barcodes may be scanned up from a single document or image. A PDF document may also be used as the input image
PagedBarcodeResult[] PDFResults = BarcodeReader.ReadBarcodesFromPdf("MultipleBarcodes.pdf");

// Work with the results
foreach (var PageResult in PDFResults)
{
    string Value = PageResult.Value;
    int PageNum = PageResult.PageNumber;
    System.Drawing.Bitmap Img = PageResult.BarcodeImage;
    BarcodeEncoding BarcodeType = PageResult.BarcodeType;
    byte[] Binary = PageResult.BinaryValue;
    Console.WriteLine(PageResult.Value + " on page " + PageNum);
}

using IronBarCode;
using System;
using System.Drawing;

// Multiple barcodes may be scanned up from a single document or image. A PDF document may also be used as the input image
PagedBarcodeResult[] PDFResults = BarcodeReader.ReadBarcodesFromPdf("MultipleBarcodes.pdf");

// Work with the results
foreach (var PageResult in PDFResults)
{
    string Value = PageResult.Value;
    int PageNum = PageResult.PageNumber;
    System.Drawing.Bitmap Img = PageResult.BarcodeImage;
    BarcodeEncoding BarcodeType = PageResult.BarcodeType;
    byte[] Binary = PageResult.BinaryValue;
    Console.WriteLine(PageResult.Value + " on page " + PageNum);
}

您將獲得包含PDF中所有位圖條碼的結果數據。

閱讀儲存在PDF中的條碼結果

從GIF和TIFF中閱讀條碼

using IronBarCode;
using System;

// Multi-frame TIFF and GIF images can also be scanned, and multiple threads will be used automatically in the background for improved performance
PagedBarcodeResult[] MultiFrameResults = BarcodeReader.ReadBarcodesFromMultiFrameTiff("Multiframe.tiff", BarcodeEncoding.Code128, BarcodeReader.BarcodeRotationCorrection.High, BarcodeReader.BarcodeImageCorrection.MediumCleanPixels);
foreach (var PageResult in MultiFrameResults)
{
    // Process each page result
}

using IronBarCode;
using System;

// Multi-frame TIFF and GIF images can also be scanned, and multiple threads will be used automatically in the background for improved performance
PagedBarcodeResult[] MultiFrameResults = BarcodeReader.ReadBarcodesFromMultiFrameTiff("Multiframe.tiff", BarcodeEncoding.Code128, BarcodeReader.BarcodeRotationCorrection.High, BarcodeReader.BarcodeImageCorrection.MediumCleanPixels);
foreach (var PageResult in MultiFrameResults)
{
    // Process each page result
}

從多幀TIFF圖像中閱讀條碼

下面的示例展示了如何從掃描的PDF中閱讀QR碼和PDF-417條碼。 我們設置了一個合適的條碼旋轉校正和條碼圖像校正級別，以輕微清潔文件而不對性能造成顯著影響。

using IronBarCode;
using System;

// PDF documents can also be scanned, and multiple threads will be used automatically in the background for improved performance
var ScanResults = BarcodeReader.ReadBarcodesFromPdf("Scan.pdf", BarcodeEncoding.All, BarcodeReader.BarcodeRotationCorrection.Low, BarcodeReader.BarcodeImageCorrection.LightlyCleanPixels);

// Work with the results
foreach (var PageResult in ScanResults)
{
    string Value = PageResult.Value;
    //...
}

using IronBarCode;
using System;

// PDF documents can also be scanned, and multiple threads will be used automatically in the background for improved performance
var ScanResults = BarcodeReader.ReadBarcodesFromPdf("Scan.pdf", BarcodeEncoding.All, BarcodeReader.BarcodeRotationCorrection.Low, BarcodeReader.BarcodeImageCorrection.LightlyCleanPixels);

// Work with the results
foreach (var PageResult in ScanResults)
{
    string Value = PageResult.Value;
    //...
}

從掃描的PDF文件中閱讀條碼

從位圖圖像中閱讀損壞的QR碼

下面的示例顯示了此C#條碼庫甚至可以閱讀損壞的條碼縮略圖。

條碼縮略圖的大小校正是自動完成的。 C#中的IronBarcode使文件可讀。

閱讀器方法自動檢測條碼圖像過小，無法成為合法條碼，並將其放大。 它們清理了所有與縮略圖相關的數位噪音，使它們再次可讀。

using IronBarCode;

// Small or 'Thumbnail' barcode images are automatically detected by IronBarcode and corrected wherever possible even if they have much digital noise.
BarcodeResult SmallResult = BarcodeReader.QuicklyReadOneBarcode("ThumbnailOfBarcode.gif", BarcodeEncoding.Code128);

using IronBarCode;

// Small or 'Thumbnail' barcode images are automatically detected by IronBarcode and corrected wherever possible even if they have much digital noise.
BarcodeResult SmallResult = BarcodeReader.QuicklyReadOneBarcode("ThumbnailOfBarcode.gif", BarcodeEncoding.Code128);

自動條碼縮略圖大小校正

從不完美的圖像中閱讀條碼

在真實世界情境中，我们可能想要从不完美的图像中读取条码。 它们可能是倾斜的图像或含有数字噪声的照片。对于大多数开源 .NET 条码生成和读取库来说，这将是不可能的。 然而，使用 IronBarcode，从不完美的图像中读取条码变得轻而易举。

现在我们将查看ReadASingleBarcode方法。 使用RotationCorrection参数，IronBarcode 尝试对不完美的数字样本进行去倾斜并读取条码。

using IronBarCode;
using System;
using System.Drawing;

// All BarcodeResult.Read methods provide the developer with control to correct image and photograph correction and straightening rotation and perspective from skewed images
// * RotationCorrection   e.g BarcodeReader.BarcodeRotationCorrection.Extreme un-rotates and removes perspective from barcode images.
// * ImageCorrection      e.g BarcodeReader.BarcodeImageCorrection.DeepCleanPixels separates barcodes from background imagery and digital noise.
// * BarcodeEncoding      e.g. BarcodeEncoding.Code128,  Setting a specific Barcode format improves speed and reduces the risk of false positive results

// Example with a photo image
var PhotoResult = BarcodeReader.ReadASingleBarcode("Photo.png", BarcodeEncoding.Code128, BarcodeReader.BarcodeRotationCorrection.Medium, BarcodeReader.BarcodeImageCorrection.DeepCleanPixels);
string Value = PhotoResult.Value;
System.Drawing.Bitmap Img = PhotoResult.BarcodeImage;
BarcodeEncoding BarcodeType = PhotoResult.BarcodeType;
byte[] Binary = PhotoResult.BinaryValue;
Console.WriteLine(PhotoResult.Value);

using IronBarCode;
using System;
using System.Drawing;

// All BarcodeResult.Read methods provide the developer with control to correct image and photograph correction and straightening rotation and perspective from skewed images
// * RotationCorrection   e.g BarcodeReader.BarcodeRotationCorrection.Extreme un-rotates and removes perspective from barcode images.
// * ImageCorrection      e.g BarcodeReader.BarcodeImageCorrection.DeepCleanPixels separates barcodes from background imagery and digital noise.
// * BarcodeEncoding      e.g. BarcodeEncoding.Code128,  Setting a specific Barcode format improves speed and reduces the risk of false positive results

// Example with a photo image
var PhotoResult = BarcodeReader.ReadASingleBarcode("Photo.png", BarcodeEncoding.Code128, BarcodeReader.BarcodeRotationCorrection.Medium, BarcodeReader.BarcodeImageCorrection.DeepCleanPixels);
string Value = PhotoResult.Value;
System.Drawing.Bitmap Img = PhotoResult.BarcodeImage;
BarcodeEncoding BarcodeType = PhotoResult.BarcodeType;
byte[] Binary = PhotoResult.BinaryValue;
Console.WriteLine(PhotoResult.Value);

从手机摄像头读取条码

IronBarcode 还可以同时读取多个条码。当我们创建文档列表并使用条码读取器来读取多个文档时，我们从 IronBarcode 得到了更好的结果。 条码扫描过程的ReadBarcodesMultithreaded方法使用多个线程，并可能使用您 CPU 的所有内核，这可能比一次读取一个条码要快得多。

using IronBarCode;

// The BarcodeResult.ReadBarcodesMultiThreaded method allows for faster barcode scanning of multiple images or PDFs. All threads are automatically managed by IronBarcode.
var ListOfDocuments = new[] { "Image1.png", "image2.JPG", "image3.pdf" };
PagedBarcodeResult[] BatchResults = BarcodeReader.ReadBarcodesMultiThreaded(ListOfDocuments);

// Work with the results
foreach (var Result in BatchResults)
{
    string Value = Result.Value;
    //...
}

using IronBarCode;

// The BarcodeResult.ReadBarcodesMultiThreaded method allows for faster barcode scanning of multiple images or PDFs. All threads are automatically managed by IronBarcode.
var ListOfDocuments = new[] { "Image1.png", "image2.JPG", "image3.pdf" };
PagedBarcodeResult[] BatchResults = BarcodeReader.ReadBarcodesMultiThreaded(ListOfDocuments);

// Work with the results
foreach (var Result in BatchResults)
{
    string Value = Result.Value;
    //...
}

要阅读 QR 代码文件，请在您的控制器中添加一个 ViewFile action 方法，如下所示。

public ActionResult ViewFile()
{
    List<KeyValuePair<string, string>> fileData = new List<KeyValuePair<string, string>>();
    KeyValuePair<string, string> data;

    string[] files = Directory.GetFiles(Server.MapPath("~/qrr"));
    foreach (string file in files)
    {
        // Create a barcode reader instance
        IBarcodeReader reader = new BarcodeReader();

        // Load a bitmap
        var barcodeBitmap = (Bitmap)Image.FromFile(Server.MapPath("~/qrr") + "/" + Path.GetFileName(file));

        // Detect and decode the barcode inside the bitmap
        var result = reader.Decode(barcodeBitmap);

        // Do something with the result
        data = new KeyValuePair<string, string>(result.ToString(), "/QR/" + Path.GetFileName(file));
        fileData.Add(data);
    }
    return View(fileData);
}

public ActionResult ViewFile()
{
    List<KeyValuePair<string, string>> fileData = new List<KeyValuePair<string, string>>();
    KeyValuePair<string, string> data;

    string[] files = Directory.GetFiles(Server.MapPath("~/qrr"));
    foreach (string file in files)
    {
        // Create a barcode reader instance
        IBarcodeReader reader = new BarcodeReader();

        // Load a bitmap
        var barcodeBitmap = (Bitmap)Image.FromFile(Server.MapPath("~/qrr") + "/" + Path.GetFileName(file));

        // Detect and decode the barcode inside the bitmap
        var result = reader.Decode(barcodeBitmap);

        // Do something with the result
        data = new KeyValuePair<string, string>(result.ToString(), "/QR/" + Path.GetFileName(file));
        fileData.Add(data);
    }
    return View(fileData);
}

阅读和解码 QR 代码

解码 QR 代码

解码位图中的条码

using ZXing;
using System.Drawing;

// Create a barcode reader instance
BarcodeReader reader = new BarcodeReader();

// Load a bitmap
var barcodeBitmap = (Bitmap)Image.FromFile("C:\\sample-barcode-image.png");

// Detect and decode the barcode inside the bitmap
var result = reader.Decode(barcodeBitmap);

// Do something with the result
if (result != null)
{
    txtDecoderType.Text = result.BarcodeFormat.ToString();
    txtDecoderContent.Text = result.Text;
}

using ZXing;
using System.Drawing;

// Create a barcode reader instance
BarcodeReader reader = new BarcodeReader();

// Load a bitmap
var barcodeBitmap = (Bitmap)Image.FromFile("C:\\sample-barcode-image.png");

// Detect and decode the barcode inside the bitmap
var result = reader.Decode(barcodeBitmap);

// Do something with the result
if (result != null)
{
    txtDecoderType.Text = result.BarcodeFormat.ToString();
    txtDecoderContent.Text = result.Text;
}

ZXing 在线解码器

ZXing 在线解码器是一个在线可用的条码和 QR 代码扫描器，支持解码。 上传 PNG 格式的 QR 代码图像，它将开始解码。 同样，您可以为任何数据生成 QR 代码。 大多数情况下，这些信息将是您想要在 QR 代码中编码的 URL 或文本。

转到 ZXing 解码器网站。

ZXing 解码器网站

ZXing 解码结果