Question

以下是相关代码：

MagickNet.InitializeMagick();
ImageMagickNET.Image image = new ImageMagickNET.Image(@"C:\temp.pdf");
image.Quality = 100;
image.CompressType = ImageMagickNET.CompressionType.LosslessJPEGCompression;
image.Write(@"C:\temp.jpg");

我相当肯定这段代码应该有效，但我得到了一个非常有用的例外：External component has thrown an exception.

此行例抛出此异常：ImageMagickNET.Image image = new ImageMagickNET.Image(@"C:\temp.pdf");

InnerException：null

堆栈跟踪：

   at Magick.Image.{ctor}(Image* , basic_string<char\,std::char_traits<char>\,std::allocator<char> >* )
   at ImageMagickNET.Image..ctor(String imageSpec)
   at WindowsFormsApplication1.Form1.ReadQRCode(String doc) in C:\Users\me\Documents\Visual Studio 2010\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs:line 126
   at WindowsFormsApplication1.Form1.seperatePDFsInOrder(String fileName) in C:\Users\me\Documents\Visual Studio 2010\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs:line 109
   at WindowsFormsApplication1.Form1.InitializeComponent() in C:\Users\me\Documents\Visual Studio 2010\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs:line 44
   at WindowsFormsApplication1.Form1..ctor() in C:\Users\me\Documents\Visual Studio 2010\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs:line 16
   at WindowsFormsApplication1.Program.Main() in C:\Users\me\Documents\Visual Studio 2010\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Program.cs:line 20
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

任何人都知道我可能做错了什么？

Answer 1

您似乎在第二个引用行中将image = new声明为 * .pdf 文件。最好用c:\tmp.jpg试一试。甚至更好c:\temp\tmp.jpg ...

ImageMagick应用其'我想将此文件解析为PDF' -mode，如果它看到后缀* .pdf。（仅当文件名没有后缀时才应用其魔术文件类型发现例程。）

运行代码的用户也可能无法写入文件c:\tmp.jpg。可能有两个原因：

c：\因为该用户无法写入目录。
该文件已存在，且该用户无法覆盖（可能属于其他用户）。

最后，请注意，ImageMagick将PDF作为输入处理的能力依赖于外部“委托”：它本身无法完成该作业，它需要在同一主机上安装Ghostscript才能调用它让它完成这项工作......

为什么我不能用ImageMagickNet打开PDF文件？

1 个答案: