如何使用 Win32 操作现有桌面快捷方式的图标？

Question

我希望能够获取当前用于快捷方式的 .ico 文件，然后将其临时更改为不同的 .ico 文件。我本来打算手动解析 .lnk 文件，但我想我可能会先在这里问一个更简单的方法。

Answer 1

使用IShellLink界面。以下是来自 MSDN 的示例：

Shell Links

// CreateLink - Uses the Shell's IShellLink and IPersistFile interfaces 
//              to create and store a shortcut to the specified object. 
//
// Returns the result of calling the member functions of the interfaces. 
//
// Parameters:
// lpszPathObj  - Address of a buffer that contains the path of the object,
//                including the file name.
// lpszPathLink - Address of a buffer that contains the path where the 
//                Shell link is to be stored, including the file name.
// lpszDesc     - Address of a buffer that contains a description of the 
//                Shell link, stored in the Comment field of the link
//                properties.

#include "stdafx.h"
#include "windows.h"
#include "winnls.h"
#include "shobjidl.h"
#include "objbase.h"
#include "objidl.h"
#include "shlguid.h"

HRESULT CreateLink(LPCWSTR lpszPathObj, LPCSTR lpszPathLink, LPCWSTR lpszDesc) 
{ 
    HRESULT hres; 
    IShellLink* psl; 

    // 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; 

        // Set the path to the shortcut target and add the description. 
        psl->SetPath(lpszPathObj); 
        psl->SetDescription(lpszDesc); 

        // Query IShellLink for the IPersistFile interface, used for saving the 
        // shortcut in persistent storage. 
        hres = psl->QueryInterface(IID_IPersistFile, (LPVOID*)&ppf); 

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

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

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

            // Save the link by calling IPersistFile::Save. 
            hres = ppf->Save(wsz, TRUE); 
            ppf->Release(); 
        } 
        psl->Release(); 
    } 
    return hres; 

// 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; 
}

在你的情况下，你会：

1. 创建IShellLink

的实例

2. 查询 IPersistFile()

3. 调用 IPersistFile.Load() 设置 .lnk 文件名

4. 调用IShellLink.Resolve()加载文件

5. 调用 IShellLink.SetIconLocation() 设置新的 .ico 文件名

6. 调用IPersistFile.Save()保存新的.lnk文件。