API提供了一个叫做IShellLink的COM接口允许我们创建快捷方式。为在桌面创建快捷方式，我们创建一个IShellLink对象，设置它的属性，然后把这个link保存到desktop目录。



下面的例子代码演示了怎样创建一个快捷方式。在这个例子里，这个快捷方式保存在C:\Drive目录下。



//----------------------------------------------------------------------

include <shlobj.h>



void __fastcall TForm1::Button1Click(TObject *Sender)

{

    if(OpenDialog1->Execute())

        CreateShortCut(OpenDialog1->FileName);

}

//----------------------------------------------------------------------

void TForm1::CreateShortCut(const AnsiString &file)

{

    IShellLink* pLink;

    IPersistFile* pPersistFile;

    if(SUCCEEDED(CoInitialize(NULL)))

    {

        if(SUCCEEDED(CoCreateInstance(CLSID_ShellLink, NULL,

                                      CLSCTX_INPROC_SERVER,

                                      IID_IShellLink, (void **) &pLink)))

        {

            pLink->SetPath(file.c_str());

            pLink->SetDescription("Woo hoo, look at Homer's shortcut");

            pLink->SetShowCmd(SW_SHOW);

            if(SUCCEEDED(pLink->QueryInterface(IID_IPersistFile,

                                              (void **)&pPersistFile)))

            {

                WideString strShortCutLocation("C:\\bcbshortcut.lnk");

                pPersistFile->Save(strShortCutLocation.c_bstr(), TRUE);

                pPersistFile->Release();

            }

            pLink->Release();

        }



        CoUninitialize();

    }

}

//----------------------------------------------------------------------

上面的例子只是把快捷方式文件保存到了c:\drive目录下，但没保存到desktop目录下。



要让快捷方式出现在桌面上，只须把快捷方式文件保存到desktop目录下。首先我们要找到windows的desktop目录，请参阅判断windows的Desktop及相关目录这一节。一旦我们知道了desktop所在的目录，我们就能将快捷方式文件保存到desktop目录下。然后windows就能将快捷方式图标显示到桌面上。下面是经过改进了的例子：



//----------------------------------------------------------------------

void TForm1::CreateShortCut(const AnsiString &file)

{

    IShellLink* pLink;

    IPersistFile* pPersistFile;

    LPMALLOC      ShellMalloc;

    LPITEMIDLIST  DesktopPidl;

    char DesktopDir[MAX_PATH];

    if(FAILED(SHGetMalloc(&ShellMalloc)))

        return;

    if(FAILED(SHGetSpecialFolderLocation(NULL,

                                        CSIDL_DESKTOPDIRECTORY,

                                        &DesktopPidl)))

        return;

    if(!SHGetPathFromIDList(DesktopPidl, DesktopDir))

    {

        ShellMalloc->Free(DesktopPidl);

        ShellMalloc->Release();

        return;

    }

    ShellMalloc->Free(DesktopPidl);

    ShellMalloc->Release();

      if(SUCCEEDED(CoInitialize(NULL)))

    {

        if(SUCCEEDED(CoCreateInstance(CLSID_ShellLink, NULL,

                                      CLSCTX_INPROC_SERVER,

                                      IID_IShellLink, (void **) &pLink)))

        {

            pLink->SetPath(file.c_str());

            pLink->SetDescription("Woo hoo, look at Homer's shortcut");

            pLink->SetShowCmd(SW_SHOW);



            if(SUCCEEDED(pLink->QueryInterface(IID_IPersistFile,

                                              (void **)&pPersistFile)))

            {

                WideString strShortCutLocation(DesktopDir);

                strShortCutLocation += "\\bcbshortcut.lnk";

                pPersistFile->Save(strShortCutLocation.c_bstr(), TRUE);

                pPersistFile->Release();

            }

            pLink->Release();

        }

        CoUninitialize();

    }

}

//----------------------------------------------------------------------

不要让你陷入到COM的复杂之中。COM只是创建和使用对象的一种方法。在这个例子里我们可以考虑不使用COM而是用等价的C++技术。



COM code                                  C++ psuedo-equivalent

IShellLink*  pLink;                      TShellLink  *Link;

IPersistFile* pPersistFile;                TPersistFile *PersistFile;



CoInitialize();

                                         

CoCreateInstance(CLSID_ShellLink,          Link = new TShellLink;

                                  NULL,

                                CLSCTX_INPROC_SERVER,

                                IID_IShellLink,

                               (void **) &pLink)

pLink->SetPath(file.c_str());              

Link->SetPath(file.c_str());

pLink->SetShowCmd(SW_SHOW);               

Link->SetShowCmd(SW_SHOW);

pLink->QueryInterface(IID_IPersistFile    PersistFile =

              (void **)&pPersistFile)))      dynamic_cast<TPersistFile*>(Link);



pPersistFile->Save("C:\\", TRUE);          

PersistFile->Save("C:\\");

pPersistFile->Release();                  

delete PersistFile

pLink->Release();                          

delete Link;

CoUninitialize();