两行Xerces程序中的异常 [英] Exception in two line Xerces program

问题描述

以下代码在 XMLFormatTarget 行上给了我一个例外，但是如果我将字符串从"C:/test.xml" 更改为"test.xml" 正常工作.

The following code gives me an exception on the XMLFormatTarget line, but if I change the string from "C:/test.xml" to "test.xml" it works fine.

// test.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/framework/LocalFileFormatTarget.hpp>

using namespace xercesc;

int main()
{
    XMLPlatformUtils::Initialize();

    XMLFormatTarget *formatTarget = new LocalFileFormatTarget("C:/test.xml"); 

    return 0;
}

Xerces例外是:

[edit] Xerces exception is:

错误信息:无法打开文件'C:\ test.xml'

Error Message: unable to open file 'C:\test.xml'

Windows例外是:

Windows exception is:

访问被拒绝

推荐答案

可能是您没有足够的权限写入 C:\ .在这种情况下，Xerces可能会报告引发异常的错误.

It could be that you don't have sufficient permissions to write to C:\. In such a case, Xerces might report the error throwing an exception.

如果您尝试在没有管理员凭据的情况下写入系统目录，通常会发生 Access Denied 例外.

An Access Denied exception is typically what we could expect if you try to write to a system directory without administrator credentials.

也许与目录分隔符也有关系:

Maybe it has also something to do with the directory separators:

XMLFormatTarget *formatTarget = new LocalFileFormatTarget("C:\\test.xml");

在Windows上，目录分隔符为反斜杠"\".有些库不在乎(而且我从没使用过Xerces，所以我不知道).在 C 和 C ++ 中，反斜杠也是转义字符，因此，如果您想要乱扔垃圾，则必须 double 字符串中的"\".

On Windows, directory separators are backslashes "\". Some libraries don't care (and I never used Xerces, so I can't tell). In C and C++, backslash is also an escape character and so you must double it if you want a litteral "\" in your string.

另外，告诉我们您所获得的例外情况将对我们有更大的帮助.

Also, telling us what was the exception you got would help us even more.

没有直接关系，但是从您的代码看来，您从未删除 formatTarget .我假设这是示例代码，但如果不是，则应在代码中添加以下行:

Not directly related, but from your code, it seems you never delete formatTarget. I assume this is sample code, but if it is not, you should add the following line to your code:

delete formatTarget;

或改用作用域指针:

boost::scoped_ptr<XMLFormatTarget> formatTarget(new LocalFileFormatTarget("C:\\test.xml"));

为避免内存泄漏.

这篇关于两行Xerces程序中的异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！