C++ 什么';解析文件路径的最佳方法是什么?
我有一系列文件路径,看起来像这样:C++ 什么';解析文件路径的最佳方法是什么?,c++,windows,path,C++,Windows,Path,我有一系列文件路径,看起来像这样: ["C:\Program", "Files", "(x86)\Common", "Files\Steam\SteamService.exe", "/RunAsService"] C:\Windows\System32\svchost.exe-k LocalSystemNetworkRestricted C:\Windows\System32\svchost C:\Program Files(x86)\Common Files\Steam\SteamServ
["C:\Program", "Files", "(x86)\Common", "Files\Steam\SteamService.exe", "/RunAsService"]
- C:\Windows\System32\svchost.exe-k LocalSystemNetworkRestricted
- C:\Windows\System32\svchost
- C:\Program Files(x86)\Common Files\Steam\SteamService.exe/RunaService
- “C:\Program Files(x86)\Common Files\Steam\SteamService.exe”/RunaService
- C:\Windows\System32\svchost.exe
- C:\Windows\System32\svchost.exe
- C:\Program Files(x86)\Common Files\Steam\SteamService.exe
- C:\Program Files(x86)\Common Files\Steam\SteamService.exe
#include <algorithm>
#include <vector>
#include <string>
#include <boost/algorithm/string.hpp>
#include <Windows.h>
namespace Path {
bool Exists(const std::wstring& path)
{
DWORD result = GetFileAttributesW(path.c_str());
return result != INVALID_FILE_ATTRIBUTES;
}
#define PATH_PREFIX_RESOLVE(path, prefix, environment) \
if (boost::algorithm::istarts_with(path, prefix)) { \
ExpandEnvironmentStringsW(environment, buffer, MAX_PATH); \
path.replace(0, (sizeof(prefix)/sizeof(wchar_t)) - 1, buffer); \
if (Exists(path)) return path; \
}
std::wstring Resolve(std::wstring path)
{
using namespace boost::algorithm;
wchar_t buffer[MAX_PATH];
trim(path);
if (path.empty() || Exists(path)) return path;
//Start by trying to see if we have a quoted path
if (path[0] == L'"') {
return std::wstring(path.begin() + 1, std::find(path.begin() + 1, path.end(), L'"'));
}
//Check for those nasty cases where the beginning of the path has no root
PATH_PREFIX_RESOLVE(path, L"\\", L"");
PATH_PREFIX_RESOLVE(path, L"?\?\\", L"");
PATH_PREFIX_RESOLVE(path, L"\\?\\", L"");
PATH_PREFIX_RESOLVE(path, L"globalroot\\", L"");
PATH_PREFIX_RESOLVE(path, L"system32\\", L"%systemroot%\\System32\\");
PATH_PREFIX_RESOLVE(path, L"systemroot\\", L"%systemroot%\\");
static std::vector<std::wstring> pathExts;
if (pathExts.empty()) {
#define MAX_ENVVAR 32767
wchar_t pathext[MAX_ENVVAR];
DWORD length = GetEnvironmentVariableW(L"PATHEXT", pathext, MAX_ENVVAR);
if (!length) WindowsApiException::ThrowFromLastError();
split(pathExts, pathext, std::bind2nd(std::equal_to<wchar_t>(), L';'));
pathExts.insert(pathExts.begin(), std::wstring());
}
std::wstring::iterator currentSpace = path.begin();
do {
currentSpace = std::find(currentSpace, path.end(), L' ');
std::wstring currentPath(path.begin(), currentSpace);
std::wstring::size_type currentPathLength = currentPath.size();
typedef std::vector<std::wstring>::const_iterator ExtIteratorType;
for(ExtIteratorType it = pathExts.begin(); it != pathExts.end(); it++) {
currentPath.replace(currentPathLength, currentPath.size() - currentPathLength, *it);
if (Exists(currentPath)) return currentPath;
}
if (currentSpace != path.end())
currentSpace++;
} while (currentSpace != path.end());
return path;
}
}
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名称空间路径{
布尔存在(常量std::wstring和path)
{
DWORD result=GetFileAttributesW(path.c_str());
返回结果!=无效的\u文件\u属性;
}
#定义路径\前缀\解析(路径、前缀、环境)\
if(boost::algorithm::istart_with(path,prefix)){\
ExpandEnvironmentStringsW(环境、缓冲区、最大路径)\
替换(0,(sizeof(前缀)/sizeof(wchar__t))-1,缓冲区)\
如果(存在(路径))返回路径\
}
std::wstring解析(std::wstring路径)
{
使用名称空间boost::算法;
wchar_t缓冲区[最大路径];
修剪(路径);
如果(path.empty()| | Exists(path))返回路径;
//首先尝试查看是否有引用的路径
如果(路径[0]==L'){
返回std::wstring(path.begin()+1,std::find(path.begin()+1,path.end(),L');
}
//检查路径开头没有根的严重情况
路径前缀解析(路径,L“\\”,L“);
路径前缀解析(路径,L“?\”,L“);
路径前缀解析(路径,L“\?\”,L“);
路径前缀解析(路径,L“globalroot\\”,L“”);
路径\前缀\解析(路径,L“system32\\”,L“%systemroot%\\system32\\”;
路径前缀解析(路径,L“systemroot\”,L“%systemroot%\\”;
静态std::向量路径exts;
if(pathExts.empty()){
#定义MAX_ENVVAR 32767
wchar_t pathext[MAX_ENVVAR];
DWORD长度=GetEnvironmentVariable(L“PATHEXT”,PATHEXT,MAX_ENVVAR);
如果(!length)WindowsApiException::ThrowFromLastError();
拆分(pathExts,pathext,std::bind2nd(std::equal_to(),L';');
insert(pathExts.begin(),std::wstring());
}
std::wstring::迭代器currentSpace=path.begin();
做{
currentSpace=std::find(currentSpace,path.end(),L“”);
std::wstring currentPath(path.begin(),currentSpace);
std::wstring::size_type currentPathLength=currentPath.size();
typedef std::vector::const_迭代器ExtIteratorType;
对于(ExtIteratorType it=pathExts.begin();it!=pathExts.end();it++){
替换(currentPathLength,currentPath.size()-currentPathLength,*it);
如果(存在(currentPath))返回currentPath;
}
if(currentSpace!=path.end())
currentSpace++;
}while(currentSpace!=path.end());
返回路径;
}
}
第4项应该相对容易。如果路径以“字符开始,只需一直读到下一个”开头,这就是路径。对于其他命令行,它稍微有点棘手,但Windows的做法是简单地将命令行分成几个部分,然后一次尝试一个,因此看看#3,它将命令行分成如下数组:
["C:\Program", "Files", "(x86)\Common", "Files\Steam\SteamService.exe", "/RunAsService"]
然后从最左边的元素开始查找文件:
你的例子应该是
::PathRemoveArgs(sPath)
,然后是::PathMatchSpec(sPath,_T(“*.exe”)
,这些不是路径,这些是恰好以路径开头的命令行。@bmargulies:我想这是真的——我想我需要上述命令行的路径部分。#3是个大问题。您如何确定您已经完成了路径(并且不要忘记有一半的时间路径是用正斜杠指定的)和斜杠分隔的参数?至少加上引号,这是可行的…@MPelletier:这就是问题的原因。CeaPATH进程似乎可以接受这些路径,尽管我认为它们是畸形的。我感觉到了你的痛苦,但是我不知道内核之外的API,它实现了创建过程的规则。这不可能完全正确——我相信CreateProcess正在解析PATEXT环境变量。如果我创建一个运行密钥(HKEY\U LOCAL\U MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\run\\Runme=“C:\Program”
),并将一个可执行文件放在C:\Program.com中,它将在启动时执行。是的,我相信你是正确的。它将尝试C:\Program.exe、C:\Program.com、C:\Program.bat等等-将尝试从PATHEXT进行所有扩展。看起来我必须自己编写grr。。。希望我不要搞砸了!:首先,他还应该调用::PathUnquoteSpaces():-)您还假设该文件是EXE文件,但事实并非如此。另外,有些