Question

如何在Windows上读取快捷方式文件的目标。尝试使用boost :: read_symlink抛出异常，说“文件或目录不是重新分析点”消息。

int main(int argc, _TCHAR* argv[])
{           
    try {
    boost::filesystem::path target = boost::filesystem::read_symlink("c:\\tmp\\blobstore_2.lnk");
    cout<<target.string();
    } catch(const boost::filesystem::filesystem_error& ex)
    {
        cout<<"in catch"<<ex.what(); // prints "the file or directory is not a reparse point"
    }

    std::ifstream smbConfStream("c:\\tmp\\sym_file_2.lnk");
    string ss((std::istreambuf_iterator<char>(smbConfStream)),
        std::istreambuf_iterator<char>());
    cout <<endl<<" ss: "<<ss; // From the output of the "ss" it looks like the information of the target is present inside ss along with other binary data. How to cleanly get the target out.

    int i;
    cin>>i;

    return 0;
}

Answer 1

Windows .lnk文件不是符号链接。这是一个快捷方式文件。您可以使用IShellLink界面来操作它。

documentation包含以下示例，演示如何解析快捷方式文件。

// ResolveIt - Uses the Shell's IShellLink and IPersistFile interfaces 
//             to retrieve the path and description from an existing shortcut. 
//
// Returns the result of calling the member functions of the interfaces. 
//
// Parameters:
// hwnd         - A handle to the parent window. The Shell uses this window to 
//                display a dialog box if it needs to prompt the user for more 
//                information while resolving the link.
// lpszLinkFile - Address of a buffer that contains the path of the link,
//                including the file name.
// lpszPath     - Address of a buffer that receives the path of the link
                  target, including the file name.
// lpszDesc     - Address of a buffer that receives the description of the 
//                Shell link, stored in the Comment field of the link
//                properties.

#include "stdafx.h"
#include "windows.h"
#include "shobjidl.h"
#include "shlguid.h"
#include "strsafe.h"

HRESULT ResolveIt(HWND hwnd, LPCSTR lpszLinkFile, LPWSTR lpszPath, int iPathBufferSize) 
{ 
    HRESULT hres; 
    IShellLink* psl; 
    WCHAR szGotPath[MAX_PATH]; 
    WCHAR szDescription[MAX_PATH]; 
    WIN32_FIND_DATA wfd; 

    *lpszPath = 0; // Assume failure 

    // Get a pointer to the IShellLink interface. It is assumed that CoInitialize
    // has already been called. 
    hres = CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER, IID_IShellLink, (LPVOID*)&psl); 
    if (SUCCEEDED(hres)) 
    { 
        IPersistFile* ppf; 

        // Get a pointer to the IPersistFile interface. 
        hres = psl->QueryInterface(IID_IPersistFile, (void**)&ppf); 

        if (SUCCEEDED(hres)) 
        { 
            WCHAR wsz[MAX_PATH]; 

            // Ensure that the string is Unicode. 
            MultiByteToWideChar(CP_ACP, 0, lpszLinkFile, -1, wsz, MAX_PATH); 

            // Add code here to check return value from MultiByteWideChar 
            // for success.

            // Load the shortcut. 
            hres = ppf->Load(wsz, STGM_READ); 

            if (SUCCEEDED(hres)) 
            { 
                // Resolve the link. 
                hres = psl->Resolve(hwnd, 0); 

                if (SUCCEEDED(hres)) 
                { 
                    // Get the path to the link target. 
                    hres = psl->GetPath(szGotPath, MAX_PATH, (WIN32_FIND_DATA*)&wfd, SLGP_SHORTPATH); 

                    if (SUCCEEDED(hres)) 
                    { 
                        // Get the description of the target. 
                        hres = psl->GetDescription(szDescription, MAX_PATH); 

                        if (SUCCEEDED(hres)) 
                        {
                            hres = StringCbCopy(lpszPath, iPathBufferSize, szGotPath);
                            if (SUCCEEDED(hres))
                            {
                                // Handle success
                            }
                            else
                            {
                                // Handle the error
                            }
                        }
                    }
                } 
            } 

            // Release the pointer to the IPersistFile interface. 
            ppf->Release(); 
        } 

        // Release the pointer to the IShellLink interface. 
        psl->Release(); 
    } 
    return hres; 
}

Answer 2

这是David的代码的更紧凑版本，带有ATL（包含在Visual Studio中）。

#define CHECK( hr ) { const HRESULT __hr = ( hr ); if( FAILED( __hr ) ) return __hr; }

HRESULT resolveShortcutTarget( HWND wnd, const CString& lnk, CString& target )
{
    // Get a pointer to the IShellLink interface. It is assumed that CoInitialize has already been called. 
    CComPtr<IShellLink> psl;
    CHECK( psl.CoCreateInstance( CLSID_ShellLink, nullptr, CLSCTX_INPROC_SERVER ) );

    // Get a pointer to the IPersistFile interface. 
    CComPtr<IPersistFile> ppf;
    CHECK( psl->QueryInterface( IID_PPV_ARGS( &ppf ) ) );

    // Load the shortcut. 
    CHECK( ppf->Load( lnk, STGM_READ ) );

    // Resolve the link. 
    CHECK( psl->Resolve( wnd, 0 ) );

    // Get the path to the link target. 
    const HRESULT hr = psl->GetPath( target.GetBufferSetLength( MAX_PATH ), MAX_PATH, nullptr, 0 );
    target.ReleaseBuffer();
    return hr;
}

windows在c ++中读取快捷方式文件的目标

2 个答案: