我正在使用 C# 进行开发,并使用 Dotnetzip 的源代码在一个文件中获取应用程序。
但是在运行时,我得到了异常:
System.OverflowException: Arithmetic operation resulted in an overflow.
at Ionic.Crc.CRC32..ctor(Int32 polynomial, Boolean reverseBits) in DotNetZip\CRC32.cs:line 452
at Ionic.Crc.CRC32..ctor(Boolean reverseBits) in DotNetZip\CRC32.cs:line 418
at Ionic.Crc.CRC32..ctor() in DotNetZip\CRC32.cs:line 398
at Ionic.Crc.CrcCalculatorStream..ctor(Boolean leaveOpen, Int64 length, Stream stream, CRC32 crc32) in DotNetZip\CRC32.cs:line 622
at Ionic.Crc.CrcCalculatorStream..ctor(Stream stream) in DotNetZip\CRC32.cs:line 519
at Ionic.Zip.ZipEntry.ExtractOne(Stream output) in DotNetZip\ZipEntry.Extract.cs:line 1043
at Ionic.Zip.ZipEntry.InternalExtract(String baseDir, Stream outstream, String password) in DotNetZip\ZipEntry.Extract.cs:line 870
at Ionic.Zip.ZipEntry.Extract(String baseDirectory, ExtractExistingFileAction extractExistingFile) in DotNetZip\ZipEntry.Extract.cs:line 240
at ItxInstaller.Package.GetData(String instFilePath) in Package.cs:line 32
at ItxInstaller.Install..ctor() in Install.cs:line 26
at ItxInstaller.Program.Main(String[] args) in Program.cs:line 54
Install.cs 是这样的:
public Install()
{
// The InitializeComponent() call is required for Windows Forms designer support.
this.InitializeComponent();
Package pack = Package.GetData(Program.args[1]);
this.Title.Text = pack.AppName;
this.PathBox.Text = pack.GeneratePath();
}
Package.cs 包含 GetData():
class Package
{
public string AppName;
public string ExePath;
private string FilePath;
public Package(string filePath)
{
this.ValueInit(filePath);
this.FilePath = filePath;
}
public static Package GetData(string instFilePath)
{
using (ZipFile Package = ZipFile.Read(instFilePath))
{
Package["app.itx"].Extract(Path.GetTempPath(), ExtractExistingFileAction.OverwriteSilently);
}
return new Package(Path.Combine(Path.GetTempPath(), "app.itx"));
}
}
如何解决这个异常?
最佳答案
当使用“-checked+”作为参数时,我可以用 Mono 重现这个问题,即启用算术检查。省略此参数会生成可运行的可执行文件。
在 Visual Studio 中也有一个项目设置。
我已经将相关代码提取到这个工作程序中,所以你可以自己测试它:
using System;
namespace Test {
public class Program {
public static void Main(string[] args) {
CRC32 test = new CRC32();
Console.Out.WriteLine(test.dwPolynomial);
}
}
public class CRC32 {
public UInt32 dwPolynomial;
public CRC32() : this(false) {
}
public CRC32(bool reverseBits) :
this(unchecked((int)0xEDB88320), reverseBits) {
}
public CRC32(int polynomial, bool reverseBits) {
this.dwPolynomial = (uint) polynomial; // this is line 452
}
}
}
使用 dcms test.cs && mono test.exe
运行良好。
使用 dcms -checked+ test.cs && mono test.exe
产生
Unhandled Exception: System.OverflowException: Number overflow.
at Test.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.OverflowException: Number overflow.
at Test.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0
更新:如果您不能或不想禁用算术检查,那么您可以将 452 之类的源代码修改为
this.dwPolynomial = unchecked((uint) polynomial);
这将关闭表达式的算术检查。
关于c# - Dotnetzip 溢出异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17102740/