Detailed description of c ++ reading the Registry

1. Read the Registry

// Read the Registry

CString ReadRegisteTable (CString root, CString path, CString key)

{

HKEY hAppKey;

LPCTSTR WINDS_SERVICE_REGISTRY_KEY = path;

LPCTSTR DATA_FILE_SUB_KEY = key;

Char szDataFile [80];

If (root = "HKEY_LOCAL_MACHINE ")

{

If (ERROR_SUCCESS = RegOpenKeyEx (

HKEY_LOCAL_MACHINE,

WINDS_SERVICE_REGISTRY_KEY,

0,

KEY_READ,

& HAppKey ))

{

ULONG cbSize = MAX_PATH * sizeof (TCHAR );

DWORD dwFlag = RegQueryValueEx (

HAppKey,

DATA_FILE_SUB_KEY,

NULL,

NULL,

(LPBYTE) szDataFile, & cbSize );

RegCloseKey (hAppKey );

If (ERROR_SUCCESS = dwFlag)

{

CString strDate = szDataFile; // MessageBox (strDate );

If (strDate. GetLength ()> 0) return strDate;

Else return "";

}

Return "";

}

}

If (root = "HKEY_CURRENT_USER ")

{

If (ERROR_SUCCESS = RegOpenKeyEx (

HKEY_CURRENT_USER,

WINDS_SERVICE_REGISTRY_KEY,

0,

KEY_READ,

& HAppKey ))

{

ULONG cbSize = MAX_PATH * sizeof (TCHAR );

DWORD dwFlag = RegQueryValueEx (

HAppKey,

DATA_FILE_SUB_KEY,

NULL,

NULL,

(LPBYTE) szDataFile, & cbSize );

RegCloseKey (hAppKey );

If (ERROR_SUCCESS = dwFlag)

{

CString strDate = szDataFile; // MessageBox (strDate );

If (strDate. GetLength ()> 0) return strDate;

Else return "";

}

Return "";

}

}

Return "";

} [Nextqage]

2. Write the Registry

// Modify the Registry

BOOL ModifyRegisteTable (CString root, CString path, CString key, CString value)

{

HKEY hAppKey;

DWORD dwDisposition = MAX_PATH * sizeof (TCHAR );

LPCTSTR WINDS_SERVICE_REGISTRY_KEY = path;

LPCTSTR DATA_FILE_SUB_KEY = key;

Char szDataFile [80]; strcpy (szDataFile, value );

If (root = "HKEY_LOCAL_MACHINE ")

{

If (ERROR_SUCCESS! = RegCreateKeyEx (

HKEY_LOCAL_MACHINE,

WINDS_SERVICE_REGISTRY_KEY,

0,

NULL,

REG_OPTION_NON_VOLATILE,

KEY_WRITE,

NULL,

& HAppKey,

& DwDisposition ))

{

Return false;

}

Else

{

If (ERROR_SUCCESS! = RegSetValueEx (hAppKey,

DATA_FILE_SUB_KEY,

0,

REG_SZ,

(LPBYTE) szDataFile,

(Lstrlen (szDataFile) + 1) * sizeof (TCHAR )))

{

Return false;

}

RegCloseKey (hAppKey );

}

}

If (root = "HKEY_CURRENT_USER ")

{

If (ERROR_SUCCESS! = RegCreateKeyEx (

HKEY_CURRENT_USER,

WINDS_SERVICE_REGISTRY_KEY,

0,

NULL,

REG_OPTION_NON_VOLATILE,

KEY_WRITE,

NULL,

& HAppKey,

& DwDisposition ))

{

Return false;

}

Else

{

If (ERROR_SUCCESS! = RegSetValueEx (hAppKey,

DATA_FILE_SUB_KEY,

0,

REG_SZ,

(LPBYTE) szDataFile,

(Lstrlen (szDataFile) + 1) * sizeof (TCHAR )))

{

Return false;

}

RegCloseKey (hAppKey );

}

}

Return true;

}