Qrcode生成二维码支持中文,带图片,带文字

1.下载Qrcode库源码, 下载地址：http://www.codeproject.com/Articles/20574/Open-Source-QRCode-Library
2.打开源码时, 部分类库可能会加载失败, 不用理会, 只需正常加载 QRCodeLib, QRCodeSampleApp 即可.
3.生成时, 会提示编译出错, Error'ThoughtWorks.QRCode.Properties.Resources' does not contain a definition for 'GetResource'.
需修改错误提示的代码行为：

MemoryStream memoryStream = new MemoryStream((byte[])Resources.ResourceManager.GetObject(fileName));

修改支持中文

修改库QRCodeLib中的类QRCodeEncoder.cs

public virtual Bitmap Encode(String content)
{
if (QRCodeUtility.IsUniCode(content))
{
return Encode(content, Encoding.Unicode);
}
else
{
return Encode(content, Encoding.ASCII);
}
}

为

public virtual Bitmap Encode(String content)
{
if (QRCodeUtility.IsUniCode(content))
{
return Encode(content, Encoding.GetEncoding("gb2312"));
}
else
{
return Encode(content, Encoding.ASCII);
}
}

对应的，QRCodeDecoder.cs类中的相应代码也要改。这样就中英文支持了。（改为UTF8也可以）

扩展
1、修改 QRCodeEncoder.cs 跟 QRCodeDecoder.cs. 搜索一下, 將 Encoding.Unicode 替換成 Encoding.UTF8
2、修改 QRCodeUtility.cs. 將 UnicodeEncoding encoding = new UnicodeEncoding(); 改成 UTF8Encoding encoding = new UTF8Encoding();

使用

QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
String encoding = cboEncoding.Text ;
if (encoding == "Byte") {
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
} else if (encoding == "AlphaNumeric") {
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;
} else if (encoding == "Numeric") {
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;
}
try {
int scale = Convert.ToInt16(txtSize.Text);
qrCodeEncoder.QRCodeScale = scale;
} catch (Exception ex) {
MessageBox.Show("Invalid size!");
return;
}
try {
int version = Convert.ToInt16(cboVersion.Text) ;
qrCodeEncoder.QRCodeVersion = version;
} catch (Exception ex) {
MessageBox.Show("Invalid version !");
}
string errorCorrect = cboCorrectionLevel.Text;
if (errorCorrect == "L")
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
else if (errorCorrect == "M")
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
else if (errorCorrect == "Q")
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
else if (errorCorrect == "H")
qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
Image image;
String data = txtEncodeData.Text;
image = qrCodeEncoder.Encode(data);
picEncode.Image = image;

带图片

/// <summary>
/// 生成二维码.
/// </summary>
/// <param name="data">需要添加进去的文本</param>
/// <returns></returns>
public System.Drawing.Image GCode(String data)
{
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
qrCodeEncoder.QRCodeScale = 5;
qrCodeEncoder.QRCodeVersion = 7;

qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
var pbImg = qrCodeEncoder.Encode(data, System.Text.Encoding.UTF8);
var width = pbImg.Width / 10;
var dwidth = width * 2;
Bitmap bmp = new Bitmap(pbImg.Width + dwidth, pbImg.Height + dwidth);
Graphics g = Graphics.FromImage(bmp);
var c = System.Drawing.Color.White;
g.FillRectangle(new SolidBrush(c), 0, 0, pbImg.Width + dwidth, pbImg.Height + dwidth);
g.DrawImage(pbImg, width, width);
g.Dispose();
return bmp;
}

/// <summary>
/// 调用此函数后使此两种图片合并，类似相册，有个
/// 背景图，中间贴自己的目标图片
/// </summary>
/// <param name="sourceImg">粘贴的源图片</param>
/// <param name="destImg">粘贴的目标图片</param>
public static System.Drawing.Image CombinImage(System.Drawing.Image imgBack, string destImg)
{

System.Drawing.Image img = System.Drawing.Image.FromFile(destImg);        //照片图片
if (img.Height != 50 || img.Width != 50) {
img = KiResizeImage(img, 50, 50, 0);
}
Graphics g = Graphics.FromImage(imgBack);

g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);      //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);

//g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一层黑色边框

//g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);

g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2 , img.Width, img.Height);
GC.Collect();
return imgBack;
}

/// <summary>
/// Resize图片
/// </summary>
/// <param name="bmp">原始Bitmap</param>
/// <param name="newW">新的宽度</param>
/// <param name="newH">新的高度</param>
/// <param name="Mode">保留着，暂时未用</param>
/// <returns>处理以后的图片</returns>
public static System.Drawing.Image KiResizeImage(System.Drawing.Image bmp, int newW, int newH, int Mode)
{
try
{
System.Drawing.Image b = new Bitmap(newW, newH);
Graphics g = Graphics.FromImage(b);

// 插值算法的质量
g.InterpolationMode = InterpolationMode.HighQualityBicubic;

g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
g.Dispose();

return b;
}
catch
{
return null;
}
}

原文地址：http://blog.csdn.net/a497785609/article/details/43019951

完整Demo下载：http://download.csdn.net/detail/a497785609/8387311