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    <p><code>GetRegistry()</code> returns a <code>char*</code>, so you are actually comparing <strong>pointers</strong> with <code>operator==</code>. You should use <code>strcmp()</code> to do raw C-like <code>char*</code> string comparisons, or better use a robust C++ string class, like <code>CString</code> or <code>std::[w]string</code>.</p> <p>Here is a possible rewrite of your function using ATL's <code>CString</code>:</p> <pre><code>#include &lt;atlbase.h&gt; #include &lt;atlstr.h&gt; CString GetRegistry(LPCTSTR pszValueName) { // Try open registry key HKEY hKey = NULL; LPCTSTR pszSubkey = _T("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\MCI Extensions"); if ( RegOpenKey(HKEY_LOCAL_MACHINE, pszSubkey, &amp;hKey) != ERROR_SUCCESS ) { // Error: // throw an exception or something... // // (In production code a custom C++ exception // derived from std::runtime_error could be used) AtlThrowLastWin32(); } // Buffer to store string read from registry TCHAR szValue[1024]; DWORD cbValueLength = sizeof(szValue); // Query string value if ( RegQueryValueEx( hKey, pszValueName, NULL, NULL, reinterpret_cast&lt;LPBYTE&gt;(&amp;szValue), &amp;cbValueLength) != ERROR_SUCCESS ) { // Error // throw an exception or something... AtlThrowLastWin32(); } // Create a CString from the value buffer return CString(szValue); } </code></pre> <p>And then you can call it like this:</p> <pre><code>if ( GetRegistry(_T("First")) == GetRegistry(_T("Second")) ) ... </code></pre> <p>Note that this code will compile in both ANSI/MBCS and Unicode builds (it's based on Win32 <code>TCHAR</code> model).</p>
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    1. POC++ Read a Registry String Value in char*
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    1. USMr.C64
    1. USMr.C64
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      1. VTUpMod
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    1. COcannot open source file "atlstr.h" cannot open source file "atlbase.h" Shoud I download something ?
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      1. USShahriyar
    2. CO@Shahriyar: You need ATL. If you use some commercial version of Visual Studio, you have it. But ATL is not available on free Express editions. (However, it seems that you can download the WDK and get ATL headers from it: see [Google Chrome building instructions for Windows](http://www.chromium.org/developers/how-tos/build-instructions-windows), which has a section on using Visual C++ 2012 Express.)
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    3. COThank you very much , my problem solved
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