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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