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    copied!<p>As Tamás pointed out you need to launch a new process with elevated rights. I searched a lot in the past but I did not find any way to elevate the rights of the current process.</p> <p>Lets say your primary app is App1.exe and then you call a secondary process App2.exe which requires elevated rights.</p> <hr> <p><strong>A. You can embed a manifest in your App2.exe but the simpler way is to create a manifest file [a text file] named App2.exe.manifest with the following contents and put it in the same directory as App2.exe.</strong> Note: !! Strangely enough, if the name of your application is not App2.exe but App2_install.exe or App2_setup.exe (i.e. if the application name contains the "install" or "setup") an UAC Dialog will appear automatically in Windows Vista / Windows 7 and will ask for elevated rights even there is no manifest file !! This is a sample of the manifest file:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt; &lt;assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"&gt; &lt;trustInfo xmlns="urn:schemas-microsoft-com:asm.v3"&gt; &lt;security&gt; &lt;requestedPrivileges&gt; &lt;requestedExecutionLevel level="requireAdministrator" uiAccess="false" /&gt; &lt;/requestedPrivileges&gt; &lt;/security&gt; &lt;/trustInfo&gt; &lt;/assembly&gt; </code></pre> <hr> <p><strong>B. You can use a code like the following in App1.exe to launch the App2.exe</strong></p> <pre><code>QString AppToExec = qApp-&gt;applicationDirPath() + "/App2.exe"; // Put any required parameters of App2.exe to AppParams string QString AppParams = ""; if (0 != genWin32ShellExecute(AppToExec, "", // default verb: "open" or "exec" AppParams, false, // run hidden true)) // wait to finish { // (...) handle error } </code></pre> <p>...and finally, this is the code of the Win32 function genWin32ShellExecute() I created to launch a process or open a document when using QT on a Win32 O/S:</p> <p><strong>Header:</strong> </p> <pre><code>#ifdef Q_OS_WIN // Implement genWin32ShellExecute() especially for UAC #include "qt_windows.h" #include "qwindowdefs_win.h" #include &lt;shellapi.h&gt; int genWin32ShellExecute(QString AppFullPath, QString Verb, QString Params, bool ShowAppWindow, bool WaitToFinish); #endif </code></pre> <p><strong>CPP:</strong> </p> <pre><code>// Execute/Open the specified Application/Document with the given command // line Parameters // (if WaitToFinish == true, wait for the spawn process to finish) // // Verb parameter values: // "" The degault verb for the associated AppFullPath // "edit" Launches an editor and opens the document for editing. // "find" Initiates a search starting from the specified directory. // "open" Launches an application. If this file is not an executable file, its associated application is launched. // "print" Prints the document file. // "properties" Displays the object's properties. // // Ret: 0 = success // &lt;0 = error #ifdef Q_OS_WIN int genWin32ShellExecute(QString AppFullPath, QString Verb, QString Params, bool ShowAppWindow, bool WaitToFinish) { int Result = 0; // Setup the required structure SHELLEXECUTEINFO ShExecInfo; memset(&amp;ShExecInfo, 0, sizeof(SHELLEXECUTEINFO)); ShExecInfo.cbSize = sizeof(SHELLEXECUTEINFO); ShExecInfo.fMask = SEE_MASK_NOCLOSEPROCESS; ShExecInfo.hwnd = NULL; ShExecInfo.lpVerb = NULL; if (Verb.length() &gt; 0) ShExecInfo.lpVerb = reinterpret_cast&lt;const WCHAR *&gt;(Verb.utf16()); ShExecInfo.lpFile = NULL; if (AppFullPath.length() &gt; 0) ShExecInfo.lpFile = reinterpret_cast&lt;const WCHAR *&gt;(AppFullPath.utf16()); ShExecInfo.lpParameters = NULL; if (Params.length() &gt; 0) ShExecInfo.lpParameters = reinterpret_cast&lt;const WCHAR *&gt;(Params.utf16()); ShExecInfo.lpDirectory = NULL; ShExecInfo.nShow = (ShowAppWindow ? SW_SHOW : SW_HIDE); ShExecInfo.hInstApp = NULL; // Spawn the process if (ShellExecuteEx(&amp;ShExecInfo) == FALSE) { Result = -1; // Failed to execute process } else if (WaitToFinish) { WaitForSingleObject(ShExecInfo.hProcess, INFINITE); } return Result; } #endif </code></pre>
 

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