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Kandy

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MFC程序读取写放注册表  

2009-03-27 22:39:32|  分类: MFC学习 |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |

        很多人在应用MFC编写读取注册表信息时,都会调用GetProfileBinary函数,但是在MSDN里面却怎么也找不到此函数的相关信息,对于此函数的变量也不知道该如何设置。我今天在编写一个关于保存应用程序屏幕的程序时,应用到此函数的时候老是提示我编译错误,后来经过查找相关资料和书籍,才找到此函数以及与其相关的函数信息。

几个成员函数函数及说明如下:

SetRegistryKey Causes application settings to be stored in the registry instead of .INI files.

SetRegistryKey 这个函数功能是设置MFC程序的注册表访问键,并把读写 ini 文件的成员函数映射到读写注册表。只要调用一下 SetRegistryKey 并指定注册表键值,那么下面6个成员函数,就被映射到进行注册表读取了。

WriteProfileBinary Writes binary data to an entry in the application's .INI file.
WriteProfileInt Writes an integer to an entry in the application's .INI file.
WriteProfileString Writes a string to an entry in the application's .INI file.


GetProfileBinary Retrieves binary data from an entry in the application's .INI file.
GetProfileInt Retrieves an integer from an entry in the application's .INI file.
GetProfileString Retrieves a string from an entry in the application's .INI file.


例子如下:
SetRegistryKey(_T("boli's app")); //这里是准备在注册表HKEY_CURRENT_USER\\software 下面生成一个boli's app 分支~为什么说是准备呢?因为如果不调用相关函数,如上面提到的6个函数,它是不会真正读写注册表的。具体本文最最下面的MFC实现摘录。
CString strUserName,strPassword;
WriteProfileString("LogInfo","UserName",strUserName); //向注册表HKEY_CURRENT_USER\\software\\boli's app\\LogInfo\\分支下写入UserName 字符串行键值~
WriteProfileString("LogInfo","Password",strPassword);//同上~

strUserName = GetProfileString("LogInfo","UserName");// 这里是读取HKEY_CURRENT_USER\\software\\boli's app\\LogInfo\\分支下的 UserName 字符串键值到 strUserName~
strPassword = GetProfileString("LogInfo","Password");

如果不是在CWinApp 派生的类中读写注册表,可以直接用:
strUserName = theApp.GetProfileString("LogInfo","UserName");
strPassword = theApp.GetProfileString("LogInfo","Password");

strUserName = AfxGetApp()->GetProfileString("LogInfo","UserName");


看看MFC的代码吧:

////////////////////////////////////////////////////////////////////////////
// CWinApp Settings Helpers

#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif

void CWinApp::SetRegistryKey(LPCTSTR lpszRegistryKey)
{
ASSERT(m_pszRegistryKey == NULL);
ASSERT(lpszRegistryKey != NULL);
ASSERT(m_pszAppName != NULL);

BOOL bEnable = AfxEnableMemoryTracking(FALSE);
free((void*)m_pszRegistryKey);
m_pszRegistryKey = _tcsdup(lpszRegistryKey);
free((void*)m_pszProfileName);
m_pszProfileName = _tcsdup(m_pszAppName);
AfxEnableMemoryTracking(bEnable);
}

void CWinApp::SetRegistryKey(UINT nIDRegistryKey)
{
ASSERT(m_pszRegistryKey == NULL);

TCHAR szRegistryKey[256];
VERIFY(AfxLoadString(nIDRegistryKey, szRegistryKey));
SetRegistryKey(szRegistryKey);
}

// returns key for HKEY_CURRENT_USER\"Software"\RegistryKey\ProfileName
// creating it if it doesn't exist
// responsibility of the caller to call RegCloseKey() on the returned HKEY
HKEY CWinApp::GetAppRegistryKey()
{
ASSERT(m_pszRegistryKey != NULL);
ASSERT(m_pszProfileName != NULL);

HKEY hAppKey = NULL;
HKEY hSoftKey = NULL;
HKEY hCompanyKey = NULL;
if (RegOpenKeyEx(HKEY_CURRENT_USER, _T("software"), 0, KEY_WRITE|KEY_READ,
   &hSoftKey) == ERROR_SUCCESS)
{
   DWORD dw;
   if (RegCreateKeyEx(hSoftKey, m_pszRegistryKey, 0, REG_NONE,
    REG_OPTION_NON_VOLATILE, KEY_WRITE|KEY_READ, NULL,
    &hCompanyKey, &dw) == ERROR_SUCCESS)
   {
    RegCreateKeyEx(hCompanyKey, m_pszProfileName, 0, REG_NONE,
     REG_OPTION_NON_VOLATILE, KEY_WRITE|KEY_READ, NULL,
     &hAppKey, &dw);
   }
}
if (hSoftKey != NULL)
   RegCloseKey(hSoftKey);
if (hCompanyKey != NULL)
   RegCloseKey(hCompanyKey);

return hAppKey;
}

// returns key for:
//      HKEY_CURRENT_USER\"Software"\RegistryKey\AppName\lpszSection
// creating it if it doesn't exist.
// responsibility of the caller to call RegCloseKey() on the returned HKEY
HKEY CWinApp::GetSectionKey(LPCTSTR lpszSection)
{
ASSERT(lpszSection != NULL);

HKEY hSectionKey = NULL;
HKEY hAppKey = GetAppRegistryKey();
if (hAppKey == NULL)
   return NULL;

DWORD dw;
RegCreateKeyEx(hAppKey, lpszSection, 0, REG_NONE,
   REG_OPTION_NON_VOLATILE, KEY_WRITE|KEY_READ, NULL,
   &hSectionKey, &dw);
RegCloseKey(hAppKey);
return hSectionKey;
}

UINT CWinApp::GetProfileInt(LPCTSTR lpszSection, LPCTSTR lpszEntry,
int nDefault)
{
ASSERT(lpszSection != NULL);
ASSERT(lpszEntry != NULL);
if (m_pszRegistryKey != NULL) // use registry
{
   HKEY hSecKey = GetSectionKey(lpszSection);
   if (hSecKey == NULL)
    return nDefault;
   DWORD dwValue;
   DWORD dwType;
   DWORD dwCount = sizeof(DWORD);
   LONG lResult = RegQueryValueEx(hSecKey, (LPTSTR)lpszEntry, NULL, &dwType,
    (LPBYTE)&dwValue, &dwCount);
   RegCloseKey(hSecKey);
   if (lResult == ERROR_SUCCESS)
   {
    ASSERT(dwType == REG_DWORD);
    ASSERT(dwCount == sizeof(dwValue));
    return (UINT)dwValue;
   }
   return nDefault;
}
else
{
   ASSERT(m_pszProfileName != NULL);
   return ::GetPrivateProfileInt(lpszSection, lpszEntry, nDefault,
    m_pszProfileName);
}
}

CString CWinApp::GetProfileString(LPCTSTR lpszSection, LPCTSTR lpszEntry,
LPCTSTR lpszDefault)
{
ASSERT(lpszSection != NULL);
ASSERT(lpszEntry != NULL);
if (m_pszRegistryKey != NULL)
{
   HKEY hSecKey = GetSectionKey(lpszSection);
   if (hSecKey == NULL)
    return lpszDefault;
   CString strValue;
   DWORD dwType, dwCount;
   LONG lResult = RegQueryValueEx(hSecKey, (LPTSTR)lpszEntry, NULL, &dwType,
    NULL, &dwCount);
   if (lResult == ERROR_SUCCESS)
   {
    ASSERT(dwType == REG_SZ);
    lResult = RegQueryValueEx(hSecKey, (LPTSTR)lpszEntry, NULL, &dwType,
     (LPBYTE)strValue.GetBuffer(dwCount/sizeof(TCHAR)), &dwCount);
    strValue.ReleaseBuffer();
   }
   RegCloseKey(hSecKey);
   if (lResult == ERROR_SUCCESS)
   {
    ASSERT(dwType == REG_SZ);
    return strValue;
   }
   return lpszDefault;
}
else
{
   ASSERT(m_pszProfileName != NULL);

   if (lpszDefault == NULL)
    lpszDefault = _T(""); // don't pass in NULL
   TCHAR szT[4096];
   DWORD dw = ::GetPrivateProfileString(lpszSection, lpszEntry,
    lpszDefault, szT, _countof(szT), m_pszProfileName);
   ASSERT(dw < 4095);
   return szT;
}
}

BOOL CWinApp::GetProfileBinary(LPCTSTR lpszSection, LPCTSTR lpszEntry,
BYTE** ppData, UINT* pBytes)
{
ASSERT(lpszSection != NULL);
ASSERT(lpszEntry != NULL);
ASSERT(ppData != NULL);
ASSERT(pBytes != NULL);
*ppData = NULL;
*pBytes = 0;
if (m_pszRegistryKey != NULL)
{
   HKEY hSecKey = GetSectionKey(lpszSection);
   if (hSecKey == NULL)
    return FALSE;

   DWORD dwType, dwCount;
   LONG lResult = RegQueryValueEx(hSecKey, (LPTSTR)lpszEntry, NULL, &dwType,
    NULL, &dwCount);
   *pBytes = dwCount;
   if (lResult == ERROR_SUCCESS)
   {
    ASSERT(dwType ==REG_DWORD);
    *ppData = new BYTE[*pBytes];
    lResult = RegQueryValueEx(hSecKey, (LPTSTR)lpszEntry, NULL, &dwType,
     *ppData, &dwCount);
   }
   RegCloseKey(hSecKey);
   if (lResult == ERROR_SUCCESS)
   {
    ASSERT(dwType == REG_DWORD);
    return TRUE;
   }
   else
   {
    delete [] *ppData;
    *ppData = NULL;
   }
   return FALSE;
}
else
{
   ASSERT(m_pszProfileName != NULL);

   CString str = GetProfileString(lpszSection, lpszEntry, NULL);
   if (str.IsEmpty())
    return FALSE;
   ASSERT(str.GetLength()%2 == 0);
   INT_PTR nLen = str.GetLength();
   *pBytes = UINT(nLen)/2;
   *ppData = new BYTE[*pBytes];
   for (int i=0;i<nLen;i+=2)
   {
    (*ppData)[i/2] = (BYTE)
     (((str[i+1] - 'A') << 4) + (str[i] - 'A'));
   }
   return TRUE;
}
}

#ifdef AFX_CORE3_SEG
#pragma code_seg(AFX_CORE3_SEG)
#endif

BOOL CWinApp::WriteProfileInt(LPCTSTR lpszSection, LPCTSTR lpszEntry,
int nValue)
{
ASSERT(lpszSection != NULL);
ASSERT(lpszEntry != NULL);
if (m_pszRegistryKey != NULL)
{
   HKEY hSecKey = GetSectionKey(lpszSection);
   if (hSecKey == NULL)
    return FALSE;
   LONG lResult = RegSetValueEx(hSecKey, lpszEntry, NULL, REG_DWORD,
    (LPBYTE)&nValue, sizeof(nValue));
   RegCloseKey(hSecKey);
   return lResult == ERROR_SUCCESS;
}
else
{
   ASSERT(m_pszProfileName != NULL);

   TCHAR szT[16];
   wsprintf(szT, _T("%d"), nValue);
   return ::WritePrivateProfileString(lpszSection, lpszEntry, szT,
    m_pszProfileName);
}
}

BOOL CWinApp::WriteProfileString(LPCTSTR lpszSection, LPCTSTR lpszEntry,
    LPCTSTR lpszValue)
{
ASSERT(lpszSection != NULL);
if (m_pszRegistryKey != NULL)
{
   LONG lResult;
   if (lpszEntry == NULL) //delete whole section
   {
    HKEY hAppKey = GetAppRegistryKey();
    if (hAppKey == NULL)
     return FALSE;
    lResult = ::RegDeleteKey(hAppKey, lpszSection);
    RegCloseKey(hAppKey);
   }
   else if (lpszValue == NULL)
   {
    HKEY hSecKey = GetSectionKey(lpszSection);
    if (hSecKey == NULL)
     return FALSE;
    // necessary to cast away const below
    lResult = ::RegDeleteValue(hSecKey, (LPTSTR)lpszEntry);
    RegCloseKey(hSecKey);
   }
   else
   {
    HKEY hSecKey = GetSectionKey(lpszSection);
    if (hSecKey == NULL)
     return FALSE;
    lResult = RegSetValueEx(hSecKey, lpszEntry, NULL, REG_SZ,
     (LPBYTE)lpszValue, (lstrlen(lpszValue)+1)*sizeof(TCHAR));
    RegCloseKey(hSecKey);
   }
   return lResult == ERROR_SUCCESS;
}
else
{
   ASSERT(m_pszProfileName != NULL);
   ASSERT(lstrlen(m_pszProfileName) < 4095); // can't read in bigger
   return ::WritePrivateProfileString(lpszSection, lpszEntry, lpszValue,
    m_pszProfileName);
}
}

BOOL CWinApp::WriteProfileBinary(LPCTSTR lpszSection, LPCTSTR lpszEntry,
LPBYTE pData, UINT nBytes)
{
ASSERT(lpszSection != NULL);
if (m_pszRegistryKey != NULL)
{
   LONG lResult;
   HKEY hSecKey = GetSectionKey(lpszSection);
   if (hSecKey == NULL)
    return FALSE;
   lResult = RegSetValueEx(hSecKey, lpszEntry, NULL, REG_BINARY,
    pData, nBytes);
   RegCloseKey(hSecKey);
   return lResult == ERROR_SUCCESS;
}

// convert to string and write out
LPTSTR lpsz = new TCHAR[nBytes*2+1];
UINT i;
for (i = 0; i < nBytes; i++)
{
   lpsz[i*2] = (TCHAR)((pData[i] & 0x0F) + 'A'); //low nibble
   lpsz[i*2+1] = (TCHAR)(((pData[i] >> 4) & 0x0F) + 'A'); //high nibble
}
lpsz[i*2] = 0;

ASSERT(m_pszProfileName != NULL);

BOOL bResult = WriteProfileString(lpszSection, lpszEntry, lpsz);
delete[] lpsz;
return bResult;
}

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