生成二维码图片:
/// <summary>
/// 生成二维码
/// </summary>
/// <param name="Content">内容文本</param>
/// <param name="QRCodeEncodeMode">二维码编码方式(注意:BYTE能支持中文,ALPHA_NUMERIC扫描出来的都是数字)</param>
/// <param name="QRCodeErrorCorrect">纠错码等级,错误效验、错误更正(有4个等级)</param>
/// <param name="QRCodeVersion">二维码版本号 0-40(注意:设置为0主要是防止编码的字符串太长时发生错误)</param>
/// <param name="QRCodeScale">每个小方格的预设宽度(像素),正整数(值越大生成的二维码图片像素越高)</param>
/// <param name="QRCodeBackgroundColor">Color.Yellow;//背景色</param>
/// <param name="QRCodeForegroundColor">Color.Green;//前景色</param>
/// <param name="size">图片尺寸(像素),0表示不设置</param>
/// <param name="border">图片白边(像素),当size大于0时有效</param>
/// <returns></returns>
public System.Drawing.Image createQRCode(string Content, QRCodeEncoder.ENCODE_MODE QRCodeEncodeMode, QRCodeEncoder.ERROR_CORRECTION QRCodeErrorCorrect, int QRCodeVersion, int QRCodeScale, int size, int border)
{
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncodeMode;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeErrorCorrect;
qrCodeEncoder.QRCodeScale = QRCodeScale;
qrCodeEncoder.QRCodeVersion = QRCodeVersion; //System.Drawing.Image image = qrCodeEncoder.Encode(Content);
System.Drawing.Image image = qrCodeEncoder.Encode(Content, Encoding.UTF8);
#region 根据设定的目标图片尺寸调整二维码QRCodeScale设置,并添加边框
if (size > 0)
{
//当设定目标图片尺寸大于生成的尺寸时,逐步增大方格尺寸
#region 当设定目标图片尺寸大于生成的尺寸时,逐步增大方格尺寸
while (image.Width < size)
{
qrCodeEncoder.QRCodeScale++;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content, Encoding.UTF8);
if (imageNew.Width < size)
{
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
}
else
{
qrCodeEncoder.QRCodeScale--; //新尺寸未采用,恢复最终使用的尺寸
imageNew.Dispose();
imageNew = null;
break;
}
}
#endregion
//当设定目标图片尺寸小于生成的尺寸时,逐步减小方格尺寸
#region 当设定目标图片尺寸小于生成的尺寸时,逐步减小方格尺寸
while (image.Width > size && qrCodeEncoder.QRCodeScale > 1)
{
qrCodeEncoder.QRCodeScale--;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content, Encoding.UTF8);
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
if (image.Width < size)
{
break;
}
}
#endregion
//如果目标尺寸大于生成的图片尺寸,则为图片增加白边
#region 如果目标尺寸大于生成的图片尺寸,则为图片增加白边
if (image.Width <= size)
{
//根据参数设置二维码图片白边的最小宽度
#region 根据参数设置二维码图片白边的最小宽度
if (border > 0)
{
while (image.Width <= size && size - image.Width < border * 2 && qrCodeEncoder.QRCodeScale > 1)
{
qrCodeEncoder.QRCodeScale--;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content, Encoding.UTF8);
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
}
}
#endregion
//当目标图片尺寸大于二维码尺寸时,将二维码绘制在目标尺寸白色画布的中心位置
if (image.Width < size)
{
//新建空白绘图
System.Drawing.Bitmap panel = new System.Drawing.Bitmap(size, size);
System.Drawing.Graphics graphic0 = System.Drawing.Graphics.fromImage(panel);
int p_left = 0;
int p_top = 0;
if (image.Width <= size) //如果原图比目标形状宽
{
p_left = (size - image.Width) / 2;
}
if (image.Height <= size)
{
p_top = (size - image.Height) / 2;
}
//将生成的二维码图像粘贴至绘图的中心位置
graphic0.DrawImage(image, p_left, p_top, image.Width, image.Height);
image = new System.Drawing.Bitmap(panel);
panel.Dispose();
panel = null;
graphic0.Dispose();
graphic0 = null;
}
}
#endregion
}
#endregion
return image;
}
private static bool IsTrue() // 在Image类别对图片进行缩放的时候,需要一个返回bool类别的委托
{
return true;
}
在aspx页面调用和输出为图片流:
string content = string.IsNullOrEmpty(Request.QueryString["txt"]) ? "http://www.lenashane.com/" : Request.QueryString["txt"];
int size = Convert.ToInt32(string.IsNullOrEmpty(Request.QueryString["size"]) ? "200" : Request.QueryString["size"]);
int border = Convert.ToInt32(string.IsNullOrEmpty(Request.QueryString["border"]) ? "10" : Request.QueryString["border"]);
System.Drawing.Image image = createQRCode(content,
QRCodeEncoder.ENCODE_MODE.BYTE,
QRCodeEncoder.ERROR_CORRECTION.M,
0,
5,
size,
border);
//将图片输出到页面
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/Png";
HttpContext.Current.Response.OutputStream.Write(ms.ToArray(), 0, ms.ToArray().Length);
HttpContext.Current.Response.End();
ms.Close();
ms = null;
image.Dispose();
image = null;
更新:
生成二维码方法,增加定位点着色参数(System.Drawing.Color),效果如下:
如有效率更高的绘制方法还望指教,下面是代码
/// <summary>
/// 生成二维码
/// </summary>
/// <param name="Content">内容文本</param>
/// <param name="QRCodeEncodeMode">二维码编码方式(注意:BYTE能支持中文,ALPHA_NUMERIC扫描出来的都是数字)</param>
/// <param name="QRCodeErrorCorrect">纠错码等级,错误效验、错误更正(有4个等级)</param>
/// <param name="QRCodeVersion">二维码版本号 0-40(注意:设置为0主要是防止编码的字符串太长时发生错误)</param>
/// <param name="QRCodeScale">每个小方格的预设宽度(像素),正整数(值越大生成的二维码图片像素越高)</param>
/// <param name="size">图片尺寸(像素),0表示不设置</param>
/// <param name="border">图片白边(像素),当size大于0时有效</param>
/// <returns></returns>
public System.Drawing.Image createQRCode(string Content, QRCodeEncoder.ENCODE_MODE QRCodeEncodeMode, QRCodeEncoder.ERROR_CORRECTION QRCodeErrorCorrect, int QRCodeVersion, int QRCodeScale, int size, int border, Color codeEyeColor)
{
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
qrCodeEncoder.QRCodeEncodeMode = QRCodeEncodeMode;
qrCodeEncoder.QRCodeErrorCorrect = QRCodeErrorCorrect;
qrCodeEncoder.QRCodeScale = QRCodeScale;
qrCodeEncoder.QRCodeVersion = QRCodeVersion;
System.Drawing.Image image = qrCodeEncoder.Encode(Content, Encoding.UTF8);
#region 根据设定的目标图片尺寸调整二维码QRCodeScale设置,并添加边框
if (size > 0)
{
//当设定目标图片尺寸大于生成的尺寸时,逐步增大方格尺寸
#region 当设定目标图片尺寸大于生成的尺寸时,逐步增大方格尺寸
while (image.Width < size)
{
qrCodeEncoder.QRCodeScale++;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content, Encoding.UTF8);
if (imageNew.Width < size)
{
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
}
else
{
qrCodeEncoder.QRCodeScale--; //新尺寸未采用,恢复最终使用的尺寸
imageNew.Dispose();
imageNew = null;
break;
}
}
#endregion
//当设定目标图片尺寸小于生成的尺寸时,逐步减小方格尺寸
#region 当设定目标图片尺寸小于生成的尺寸时,逐步减小方格尺寸
while (image.Width > size && qrCodeEncoder.QRCodeScale > 1)
{
qrCodeEncoder.QRCodeScale--;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content, Encoding.UTF8);
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
if (image.Width < size)
{
break;
}
}
#endregion
//根据参数设置二维码图片白边的最小宽度(按需缩小)
#region 根据参数设置二维码图片白边的最小宽度
if (image.Width <= size && border > 0)
{
while (image.Width <= size && size - image.Width < border * 2 && qrCodeEncoder.QRCodeScale > 1)
{
qrCodeEncoder.QRCodeScale--;
System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content, Encoding.UTF8);
image = new System.Drawing.Bitmap(imageNew);
imageNew.Dispose();
imageNew = null;
}
}
#endregion
//已经确认二维码图像,为图像染色修饰
if (true)
{
//定位点方块边长
int beSize = qrCodeEncoder.QRCodeScale * 3;
int bep1_l = qrCodeEncoder.QRCodeScale * 2;
int bep1_t = qrCodeEncoder.QRCodeScale * 2;
int bep2_l = image.Width - qrCodeEncoder.QRCodeScale * 5 - 1;
int bep2_t = qrCodeEncoder.QRCodeScale * 2;
int bep3_l = qrCodeEncoder.QRCodeScale * 2;
int bep3_t = image.Height - qrCodeEncoder.QRCodeScale * 5 - 1;
int bep4_l = image.Width - qrCodeEncoder.QRCodeScale * 7 - 1;
int bep4_t = image.Height - qrCodeEncoder.QRCodeScale * 7 - 1;
System.Drawing.Graphics graphic0 = System.Drawing.Graphics.fromImage(image);
// create solid brush.
SolidBrush blueBrush = new SolidBrush(codeEyeColor);
// Fill rectangle to screen.
graphic0.FillRectangle(blueBrush, bep1_l, bep1_t, beSize, beSize);
graphic0.FillRectangle(blueBrush, bep2_l, bep2_t, beSize, beSize);
graphic0.FillRectangle(blueBrush, bep3_l, bep3_t, beSize, beSize);
graphic0.FillRectangle(blueBrush, bep4_l, bep4_t, qrCodeEncoder.QRCodeScale, qrCodeEncoder.QRCodeScale);
}
//当目标图片尺寸大于二维码尺寸时,将二维码绘制在目标尺寸白色画布的中心位置
#region 如果目标尺寸大于生成的图片尺寸,将二维码绘制在目标尺寸白色画布的中心位置
if (image.Width < size)
{
//新建空白绘图
System.Drawing.Bitmap panel = new System.Drawing.Bitmap(size, size);
System.Drawing.Graphics graphic0 = System.Drawing.Graphics.fromImage(panel);
int p_left = 0;
int p_top = 0;
if (image.Width <= size) //如果原图比目标形状宽
{
p_left = (size - image.Width) / 2;
}
if (image.Height <= size)
{
p_top = (size - image.Height) / 2;
}
//将生成的二维码图像粘贴至绘图的中心位置
graphic0.DrawImage(image, p_left, p_top, image.Width, image.Height);
image = new System.Drawing.Bitmap(panel);
panel.Dispose();
panel = null;
graphic0.Dispose();
graphic0 = null;
}
#endregion
}
#endregion
return image;
}