WKHTMLTOPDF不渲染Base64图像
本文关键字:Base64 图像 WKHTMLTOPDF | 更新日期: 2023-09-27 18:16:00
我有以下简单的HTML页面:
<html>
<head>
<title></title>
</head>
<body>
<div>
<img id="image" src="data:image/gif;base64,R0lGODlhFwAPAKEAAP///wAAAMzMzLi3tywAAAAAFwAPAAACQIyPqQjtD98RIVpJ66g3hgEYDdVhjThyXSA4aLq2rgp78hxlyY0/ICAIBhu/HrEEKIZUyk4R1Sz9RFEkaIHNFgAAOw==" />
</div>
</body>
</html>
我试图让PDF渲染Base64编码GIF使用以下:
public static byte[] HTMLToPDF(string htmlText)
{
Process p;
ProcessStartInfo psi = new ProcessStartInfo();
psi.FileName = HttpContext.Current.Server.MapPath("~/App_Data/wkhtmltopdf/wkhtmltopdf.exe");
// run the conversion utility
psi.UseShellExecute = false;
psi.CreateNoWindow = true;
psi.RedirectStandardInput = true;
psi.RedirectStandardOutput = true;
psi.RedirectStandardError = true;
// note: that we tell wkhtmltopdf to be quiet and not run scripts
string args = "-q -n ";
args += "--disable-smart-shrinking ";
//args += "--orientation Landscape ";
args += "--outline-depth 0 ";
args += "--page-size A4 ";
args += " - -";
psi.Arguments = args;
p = Process.Start(psi);
try
{
using (StreamWriter stdin = p.StandardInput)
{
stdin.AutoFlush = true;
stdin.Write(htmlText);
}
//read output
byte[] buffer = new byte[32768];
byte[] file;
using (var ms = new MemoryStream())
{
while (true)
{
int read = p.StandardOutput.BaseStream.Read(buffer, 0, buffer.Length);
if (read <= 0)
break;
ms.Write(buffer, 0, read);
}
file = ms.ToArray();
}
p.StandardOutput.Close();
// wait or exit
p.WaitForExit(60000);
// read the exit code, close process
int returnCode = p.ExitCode;
p.Close();
if (returnCode == 0)
return file;
}
catch (Exception ex)
{
}
finally
{
p.Close();
p.Dispose();
}
return null;
}
然而,当PDF显示图像不存在(只是一个小框)我做错了什么?
我有这个问题。html内容可以通过chrome渲染,但是通过wkhtmltopdf就不行。
这是因为base64字符串的头项之间有空格。
应该是:
data:[<media type>][;charset=<character set>][;base64],<data>
And i had
data: [<media type>][; charset=<character set>][; base64], <data>
Wkhtmltopdf显然比chrome更严格。不要在base64页眉中使用空格
我升级到最新版本的WKHTMLTOPDF,修复了这个问题:
http://wkhtmltopdf.org/对于我来说,它是img标签样式的max-width和max-height属性。当它们被删除后,base64图像显示在pdf