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  1. PO
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    <p><strong>Here is some pseudo-code to retrieve the following:</strong></p> <ol> <li>If a registry key exists</li> <li>What the default value is for that registry key</li> <li>What a string value is</li> <li>What a DWORD value is</li> </ol> <p><strong>Example code:</strong></p> <p>Include the library dependency: Advapi32.lib</p> <pre><code>HKEY hKey; LONG lRes = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Perl", 0, KEY_READ, &amp;hKey); bool bExistsAndSuccess (lRes == ERROR_SUCCESS); bool bDoesNotExistsSpecifically (lRes == ERROR_FILE_NOT_FOUND); std::wstring strValueOfBinDir; std::wstring strKeyDefaultValue; GetStringRegKey(hKey, L"BinDir", strValueOfBinDir, L"bad"); GetStringRegKey(hKey, L"", strKeyDefaultValue, L"bad"); LONG GetDWORDRegKey(HKEY hKey, const std::wstring &amp;strValueName, DWORD &amp;nValue, DWORD nDefaultValue) { nValue = nDefaultValue; DWORD dwBufferSize(sizeof(DWORD)); DWORD nResult(0); LONG nError = ::RegQueryValueExW(hKey, strValueName.c_str(), 0, NULL, reinterpret_cast&lt;LPBYTE&gt;(&amp;nResult), &amp;dwBufferSize); if (ERROR_SUCCESS == nError) { nValue = nResult; } return nError; } LONG GetBoolRegKey(HKEY hKey, const std::wstring &amp;strValueName, bool &amp;bValue, bool bDefaultValue) { DWORD nDefValue((bDefaultValue) ? 1 : 0); DWORD nResult(nDefValue); LONG nError = GetDWORDRegKey(hKey, strValueName.c_str(), nResult, nDefValue); if (ERROR_SUCCESS == nError) { bValue = (nResult != 0) ? true : false; } return nError; } LONG GetStringRegKey(HKEY hKey, const std::wstring &amp;strValueName, std::wstring &amp;strValue, const std::wstring &amp;strDefaultValue) { strValue = strDefaultValue; WCHAR szBuffer[512]; DWORD dwBufferSize = sizeof(szBuffer); ULONG nError; nError = RegQueryValueExW(hKey, strValueName.c_str(), 0, NULL, (LPBYTE)szBuffer, &amp;dwBufferSize); if (ERROR_SUCCESS == nError) { strValue = szBuffer; } return nError; } </code></pre>
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    1. POHow to read a value from the Windows registry
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    1. USLou Franco
    1. USBrian R. Bondy
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    1. POHow to read a value from the Windows registry
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    1. COIf for some inexplicable reason this never seems to find a key it may be a 32-bit/64-bit problem. See http://stackoverflow.com/q/15084380/482758
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