IronBarCode 無法辨識 MSI 條碼

Curtis Chau

更新:8月 19, 2025

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問題

使用 IronBarCode 庫建立 MSI 條碼時，有時BarcodeReader.Read方法無法讀取產生的 MSI 條碼，導致掃描結果為空，且條碼會傳回預期值。

解決方案

為了確保BarcodeReader.Read可以讀取 MSI 條碼，我們必須為Read方法提供輔助可選參數BarcodeReaderOptions 。在BarcodeReaderOptions中，我們透過賦值ExpectedBarcodeTypes來明確指定我們要讀取的條碼類型。這樣， Read方法就可以識別由 IronBarCode 產生的 MSI 條碼以及任何外部 MSI 條碼。

下面是一個如何將BarcodeReaderOptions應用於BarcodeReader.Read的簡單範例。

程式碼範例

// Creating MSI Barcode with the value "12345"
var myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.MSI);

// Save barcode as image
myBarcode.SaveAsImage("msi.png");

// Reading MSI
var barcodeReaderOptions = new BarcodeReaderOptions
{
     // Assigning BarcodeEncoding.MSI to ExpectBarcodeType to ensure that IronBarcode expects MSI type barcodes specifically 
  ExpectBarcodeTypes = BarcodeEncoding.MSI,
};

// Read barcode with additional barcodeReaderOptions from above
var barcodeResults = BarcodeReader.Read("msi.png", barcodeReaderOptions);

// Using a for loop and print out the result 
foreach (BarcodeResult result in barcodeResults)
{
  Console.WriteLine(result.Text);
    // Output: 12345 
}

// Creating MSI Barcode with the value "12345"
var myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.MSI);

// Save barcode as image
myBarcode.SaveAsImage("msi.png");

// Reading MSI
var barcodeReaderOptions = new BarcodeReaderOptions
{
     // Assigning BarcodeEncoding.MSI to ExpectBarcodeType to ensure that IronBarcode expects MSI type barcodes specifically 
  ExpectBarcodeTypes = BarcodeEncoding.MSI,
};

// Read barcode with additional barcodeReaderOptions from above
var barcodeResults = BarcodeReader.Read("msi.png", barcodeReaderOptions);

// Using a for loop and print out the result 
foreach (BarcodeResult result in barcodeResults)
{
  Console.WriteLine(result.Text);
    // Output: 12345 
}

' Creating MSI Barcode with the value "12345"
Dim myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.MSI)

' Save barcode as image
myBarcode.SaveAsImage("msi.png")

' Reading MSI
Dim barcodeReaderOptions As New BarcodeReaderOptions With {.ExpectBarcodeTypes = BarcodeEncoding.MSI}

' Read barcode with additional barcodeReaderOptions from above
Dim barcodeResults = BarcodeReader.Read("msi.png", barcodeReaderOptions)

' Using a for loop and print out the result 
For Each result As BarcodeResult In barcodeResults
  Console.WriteLine(result.Text)
	' Output: 12345 
Next result

$vbLabelText $csharpLabel

在這個範例中，我們首先實例化一個新的BarcodeReaderOptions變量，然後將ExpectedBarcodeTypes賦值為BarcodeEncoding.MSI枚舉，指示 IronBarcode 期望 MSI 條碼。之後，我們在 for 迴圈中列印出條碼的值，即 12345，因為barcodeResults傳回一個BarcodeResults數組，然後遍歷每個結果以取得文字值。