我們原本使用的是 Code 39 的條碼，因為我們為了簡化進貨或盤點時的資料輸入(如：有效日期或批號等等...)，再加上 Code 39 的資料越多則長度就越長，甚至會超出 Barcode Reader 的可掃瞄範圍，再加上很多的醫藥材都是使用 Code 128，所以我們導入了國際條碼。這個過程真的花了一番心力，現在我們將這項成果導入在文件的生成與辨識。
注意！以下這些 Code，已經忘記出處在那裡，若有人知道煩請告知，真是對不起原作者！
一、了解及準備 Code 128 字型檔
這兩篇 Blog 不錯，對於不了解什麼是 Barcode 的人，可以有初步的認識。
二、轉換 Barcode 資料及產生 Barcode 影像
Private Sub btnCode128_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCode128.Click
Dim _data As String = "038000356216"
' Font Style
Dim privateFonts As New System.Drawing.Text.PrivateFontCollection()
privateFonts.AddFontFile("C:\WINDOWS\Fonts\3of9.ttf")
privateFonts.AddFontFile("C:\WINDOWS\Fonts\code128.ttf")
Dim font39 As New System.Drawing.Font(privateFonts.Families(0), 36)
Dim font128 As New System.Drawing.Font(privateFonts.Families(1), 36)
' Code39：資料前後加上"*"做為啟始碼/停止碼即可
Me.lblCode39.Font = font39
Me.lblCode39.Text = BarcodeConverter39.StringToBarcode(_data)
Me.lblCode39.AutoSize = True
' Code128：是由 啟始碼+資料碼+檢查碼+停止碼 所組合而成的條碼
Me.lblCode128.Font = font128
Me.lblCode128.Text = BarcodeConverter128.StringToBarcode(_data)
' Image Style
Dim barcode As New BarcodeLib.Barcode()
barcode.IncludeLabel = True
barcode.Width = 300
barcode.Height = 150
barcode.Encode(BarcodeLib.TYPE.CODE128, _data)
Dim ms As New MemoryStream()
barcode.SaveImage(ms, BarcodeLib.SaveTypes.PNG)
Me.PictureBox1.Image = System.Drawing.Image.FromStream(ms)
End Sub
三、取出 Barcode 資料
參考 GS1 General Specifications(Version 12)，我們需要取得商品代號、有效日期及批號。
- (01)商品代號~固定長度(數字形態，長度14)
- (17)有效日期~固定長度(數字形態，長度6)
- (10)批號~變動長度(數字形態，長度最多20)
private void btnGS1Barcode_Click(object sender, EventArgs e)
{
string barcode;
// 測試樣本
//barcode = "0108888893102146";
//barcode = "010888889310214617120315";
barcode = "01088888931021461712031510W1040190";
string Ai01; // (01)08888893102146
string Ai17; // (17)120315
string Ai10; // (10)W1040190
GS1BarcodeConvert(barcode, out Ai01, out Ai17, out Ai10);
Application.DoEvents();
}
private void GS1BarcodeConvert(string pBarcode, out string pAi01, out string pAi17, out string pAi10)
{
pAi01 = string.Empty;
pAi17 = string.Empty;
pAi10 = string.Empty;
string AI;
string DataContent = pBarcode;
while (!string.IsNullOrEmpty(DataContent))
{
AI = DataContent.Substring(0, 2);
if (AI == "01")
{
// Global Trade Item Number (GTIN)
// N2 N14
pAi01 = DataContent.Substring(2, 14);
if (checkSum(pAi01.Remove(pAi01.Length - 1, 1), Int32.Parse(pAi01.Substring(pAi01.Length - 1, 1))))
{
}
else
{
pAi17 = string.Empty;
}
DataContent = DataContent.Substring(16);
}
else if (AI == "17")
{
// Expiration Date (YYMMDD)
// N2 N6
pAi17 = DataContent.Substring(2, 6);
if (checkDate(pAi17) > DateTime.MinValue)
{
}
else
{
pAi17 = string.Empty;
}
DataContent = DataContent.Substring(8);
}
else if (AI == "10")
{
// Batch or Lot Number
// N2 X..20
pAi10 = DataContent.Length < 20 ? DataContent.Substring(2, DataContent.Length - 2) : DataContent.Substring(2, 20);
DataContent = DataContent.Substring(pAi10.Length 2);
}
}
}
private Boolean checkSum(String pgtin, Int32 pchecksum)
{
Boolean ret = false;
Int32 glength = 0;
Int32 total = 0;
Int32 cSum = 0;
Int32[] mutiply = { 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3 };
glength = 17 - pgtin.Length;
for (int i = 0; i < pgtin.Length; i )
{
total = total (Int32.Parse(pgtin[i].ToString()) * mutiply[i glength]);
}
cSum = 10 - (total % 10);
if (cSum == pchecksum)
{
ret = true;
}
return ret;
}
private DateTime checkDate(string pdate)
{
DateTime ret = DateTime.MinValue;
DateTime convertedDate = DateTime.MinValue;
String dFormat = "yyMMdd";
if (DateTime.TryParseExact(pdate, dFormat, System.Globalization.CultureInfo.CurrentCulture, System.Globalization.DateTimeStyles.None, out convertedDate))
{
ret = convertedDate;
}
return ret;
}
private void GS1DataConvert(string pBarcode, out string pAi01, out string pAi17, out string pAi10)
{
pAi01 = string.Empty;
pAi17 = string.Empty;
pAi10 = string.Empty;
String aiFull = "";
String aiWCheckSum = "";
String aiValue = "";
Int32 aiCheckSum = 0;
Int32 aiMinLength = 0;
Int32 aiMaxLength = 0;
int index = 0;
if (pBarcode.Contains("01"))
{
index = pBarcode.IndexOf("01") 2;
AII sai = getAiInfo("01");
aiMinLength = sai.minLength;
aiMaxLength = sai.maxLength;
aiFull = pBarcode.Substring(index - 2, aiMaxLength 2);
aiWCheckSum = pBarcode.Substring(index, aiMaxLength);
aiValue = aiWCheckSum.Remove(aiWCheckSum.Length - 1, 1);
aiCheckSum = Int32.Parse(aiWCheckSum.Substring(aiWCheckSum.Length - 1, 1));
if (checkSum(aiValue, aiCheckSum))
{
pBarcode = pBarcode.Replace(aiFull, String.Empty);
pAi01 = aiValue;
}
}
if (pBarcode.Contains("17"))
{
index = pBarcode.IndexOf("17") 2;
AII sai = getAiInfo("17");
aiFull = pBarcode.Substring(index - 2, sai.minLength 2);
aiValue = pBarcode.Substring(index, sai.minLength);
if (checkDate(aiValue) > DateTime.MinValue)
{
pBarcode = pBarcode.Replace(aiFull, String.Empty);
pAi17 = aiValue;
}
}
if (pBarcode.Contains("10"))
{
index = pBarcode.IndexOf("10") 2;
AII sai = getAiInfo("10");
aiMinLength = sai.minLength;
aiMaxLength = pBarcode.Length < sai.maxLength ? pBarcode.Length - 2 : sai.maxLength;
aiFull = pBarcode.Substring(index - 2, aiMaxLength 2);
aiValue = pBarcode.Substring(index, aiMaxLength);
pAi10 = aiValue;
}
}
public AII getAiInfo(String pAi)
{
AII naii = new AII();
if (pAi == "01")
{
naii.AICode = "01";
naii.minLength = 14;
naii.maxLength = 14;
return naii;
}
if (pAi == "17")
{
naii.AICode = "17";
naii.minLength = 6;
naii.minLength = 6;
return naii;
}
if (pAi == "10")
{
naii.AICode = "10";
naii.minLength = 1;
naii.maxLength = 20;
}
return naii;
}
public struct AII
{
public String AICode;
public Int32 minLength;
public Int32 maxLength;
}
四、參考資料
[1]
Free Barcode Font - Barcode String Builder
[2]
Barcode Image Generation Library
[3]
EAN128 or GS1-128 decode c#
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