[英]Checking if Registry Value exists Visual C++ 2005
Im trying to code a Visual C++ 2005 routine that checks the registry for certain keys/values. 我试图编写一个Visual C ++ 2005例程来检查注册表中的某些键/值。 I have no trouble in writing code using c# but I need it in C++.
使用c#编写代码没有问题,但我需要用C ++编写代码。 Anybody know how to do this using c++ in vs2005.
任何人都知道如何在vs2005中使用c ++来做到这一点。
Many thanks Tony 非常感谢Tony
Here is some pseudo-code to retrieve the following: 这是一些用于检索以下内容的伪代码:
Example code: 示例代码:
Include the library dependency: Advapi32.lib 包含库依赖项:Advapi32.lib
Put the following in your main or where you want to read the values: 将以下内容放在main中或要读取值的位置:
HKEY hKey;
LONG lRes = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Perl", 0, KEY_READ, &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");
Put these wrapper functions at the top of your code: 将这些包装函数放在代码的顶部:
LONG GetDWORDRegKey(HKEY hKey, const std::wstring &strValueName, DWORD &nValue, DWORD nDefaultValue)
{
nValue = nDefaultValue;
DWORD dwBufferSize(sizeof(DWORD));
DWORD nResult(0);
LONG nError = ::RegQueryValueExW(hKey,
strValueName.c_str(),
0,
NULL,
reinterpret_cast<LPBYTE>(&nResult),
&dwBufferSize);
if (ERROR_SUCCESS == nError)
{
nValue = nResult;
}
return nError;
}
LONG GetBoolRegKey(HKEY hKey, const std::wstring &strValueName, bool &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 &strValueName, std::wstring &strValue, const std::wstring &strDefaultValue)
{
strValue = strDefaultValue;
WCHAR szBuffer[512];
DWORD dwBufferSize = sizeof(szBuffer);
ULONG nError;
nError = RegQueryValueExW(hKey, strValueName.c_str(), 0, NULL, (LPBYTE)szBuffer, &dwBufferSize);
if (ERROR_SUCCESS == nError)
{
strValue = szBuffer;
}
return nError;
}
There are Win32 APIs available: take a look at MSDN for RegOpenKey
and friends (and the Registry Functions in general). 有可用的Win32 API:查看MSDN for
RegOpenKey
和朋友(以及一般的注册表功能 )。
Here is an example of 'Deleting a Key with Subkeys' . 以下是“使用子键删除密钥”的示例。
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