本文介绍在 C# 中使用 ThoughtWorks.QRCode.dll 生成指定尺寸和边框宽度的二维码。网上文章大多只是简单介绍内置参数的设置,根据我的使用目的,增加了自定义目标二维码图片尺寸和白边边框。有需要的朋友们可以试一下,如有bug欢迎指正。
首先,将 ThoughtWorks.QRCode.dll 放在 bin 目录后,在页面中引用:
using
ThoughtWorks.QRCode.Codec;
生成二维码图片:
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/// <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</param> /// <param name="QRCodeErrorCorrect">纠错码等级</param> /// <param name="QRCodeVersion">二维码版本号 0-40</param> /// <param name="QRCodeScale">每个小方格的预设宽度(像素),正整数</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);
#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);
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);
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);
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:
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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 ;
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生成二维码方法,增加定位点着色参数(System.Drawing.Color),效果如下:
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/// <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</param> /// <param name="QRCodeErrorCorrect">纠错码等级</param> /// <param name="QRCodeVersion">二维码版本号 0-40</param> /// <param name="QRCodeScale">每个小方格的预设宽度(像素),正整数</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);
#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);
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);
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);
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;
} |