c++ 代码调用nsis安装包实现静默安装

TCHAR szCurPath[MAX_PATH] = {0};
GetCurrentDirectory(MAX_PATH, szCurPath);

TCHAR szFile[MAX_PATH] = {0};
_stprintf_s(szFile, MAX_PATH, _T("%s\\setup.exe"), szCurPath);

CString szPath = szFile;
CString szCmdline = _T("");
CString szWorking;
szWorking = szPath.Mid( 0, szPath.ReverseFind( '\\' ) );
        
PROCESS_INFORMATION pi;
STARTUPINFO si;
memset( &si, 0, sizeof( si ) );
si.cb = sizeof( si );
si.wShowWindow = SW_SHOW;
si.dwFlags = STARTF_USESHOWWINDOW;

szCmdline = _T("/NCRC /S /D=");
szCmdline.Append(szCurPath);

BOOL fRet = CreateProcess( szPath, szCmdline.GetBuffer(), NULL, FALSE, NULL, NULL, NULL, szWorking, &si, &pi );
...

以上方法使用CreateProcess函数创建一个进程并启动安装包静默安装，/D指定默认安装位置（没有引号，否则不生效），优先级最高。

不过当遇到需要提示权限的情况（需要以管理员身份运行），CreateProcess会执行失败，这时需提升权限，代码如下：

// ------提升权限------
        // Initialize the structure.
        SHELLEXECUTEINFO sei = { sizeof(SHELLEXECUTEINFO) };
        sei.fMask = SEE_MASK_NOCLOSEPROCESS;
        // Ask for privileges elevation.
        sei.lpVerb = TEXT("runas");

        // Create a Command Prompt from which you will be able to start
        // other elevated applications.
        sei.lpFile = szFile;
        sei.lpParameters = szCmdline;
        sei.lpDirectory = szWorking;

        // Don't forget this parameter; otherwise, the window will be hidden.
        sei.nShow = SW_SHOWNORMAL;

        if (!ShellExecuteEx(&sei)) {
                DWORD dwStatus = GetLastError();

                if (dwStatus == ERROR_CANCELLED) {
                        // The user refused to allow privileges elevation.
                        UpdateMessage(_T("用户拒绝安装，升级失败。"));
                }
                else if (dwStatus == ERROR_FILE_NOT_FOUND) {
                        // The file defined by lpFile was not found and
                        // an error message popped up.
                        UpdateMessage(_T("升级包不存在，请检查！"));
                }

                CString strMsg;
                ::GetLastErrorString(strMsg);
                LOG_ERROR(_T("启动安装程序失败：%s"), strMsg);

                return -1;
        }

        m_hCreatePackage = sei.hProcess;                // 句柄

m_hCreatePackage 存储安装包进程的句柄，有了它我们就可以使用 WaitForSingleObject 对其执行各阶段的逻辑进行处理，后面请大家自己发挥了。