[教學] Decode/Encode QRCode (C# version)－一個小小工程師的心情抒發天地

一樣超簡單的方法，來吧 !

Step1. 開啟一個C# 的Project

Stpe2.將Control都拉一下 ( 如圖 )

Step3.去下載Lib (https://archive.codeplex.com/?p=zxingnet ) "ZXing"

將這個Lib放到你開發的專案中

Step4.將這個Lib add to reference

Step5.接下來我們來寫點程式吧~顆顆 ( 群輝大魔王的迷樣的賤笑 )

----> 點擊你的按鈕，直接進去 ( 我們先寫Encode 的部分 )

private void m_btnEncode_Click(object sender, EventArgs e)
{
//Use bitmap to storage qr-code
System.Drawing.Bitmap bitmap = null;
//let string to qr-code
string strQrCodeContent = m_editInput.Text;

//Setting Qr - code ( use (zxing.dll)lib )
/*
Step1. Download zxing.dll
Step2. put this file to project
Step3. add reference
*/
ZXing.BarcodeWriter writer = new ZXing.BarcodeWriter
{
Format = ZXing.BarcodeFormat.QR_CODE,
Options = new ZXing.QrCode.QrCodeEncodingOptions
{
//Create Photo
Height = 200,
Width = 200,
CharacterSet = "UTF-8",

//錯誤修正容量
//L水平   7%的字碼可被修正
//M水平   15%的字碼可被修正
//Q水平   25%的字碼可被修正
//H水平   30%的字碼可被修正
ErrorCorrection = ZXing.QrCode.Internal.ErrorCorrectionLevel.H
}

};
//Create Qr-code , use input string
bitmap = writer.Write(strQrCodeContent);
//Storage bitmpa

string strDir;
strDir = Directory.GetCurrentDirectory();
strDir += "\\temp.png";
bitmap.Save(strDir, System.Drawing.Imaging.ImageFormat.Png);
//Display to picturebox
pictureBox1.Image = bitmap;
}

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我們直接將PNG保存到Directory去，加上名稱，等等我們就Load這張就好

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Step6.接下來我們來寫Decode的部分

private void m_btnDecode_Click(object sender, EventArgs e)
{
//like before , create a bitmap
System.Drawing.Bitmap bitmap = null;
//Create QRCode Reader Object
ZXing.IBarcodeReader reader = new ZXing.BarcodeReader();

//Load QrCode picture
string strDir;
strDir = Directory.GetCurrentDirectory();
strDir += "\\temp.png";
FileStream file = new FileStream(strDir, FileMode.Open);
Byte[] data = new Byte[file.Length];

file.Read(data, 0, data.Length);
file.Close();

MemoryStream ms = new MemoryStream(data);
bitmap = (Bitmap)Image.FromStream(ms);

//Show picture to picture box
pictureBox2.Image = bitmap;
//decode
ZXing.Result decodeResult = reader.Decode(bitmap);

if (decodeResult != null)
{
m_editOutput.Text = decodeResult.Text;
}
else
{
MessageBox.Show("Error");
}

}