RegSetValueEx() problem

This is a discussion on RegSetValueEx() problem within the Windows Programming forums, part of the Platform Specific Boards category; i had a look around the MSDN site, and found what i wanted, but i'll be damned if I ever ...

  1. #1
    Registered User Kupo's Avatar
    Join Date
    Dec 2001
    Posts
    36

    RegSetValueEx() problem

    i had a look around the MSDN site, and found what i wanted, but i'll be damned if I ever understand the way the describe it.

    if someone could tell me how to use this:

    Code:
    LONG RegSetValueEx(
      HKEY hKey,           // handle to key
      LPCTSTR lpValueName, // value name
      DWORD Reserved,      // reserved
      DWORD dwType,        // value type
      CONST BYTE *lpData,  // value data
      DWORD cbData         // size of value data
    );
    i would be eternally grateful

  2. #2
    Registered User
    Join Date
    Nov 2001
    Posts
    162
    Here is what I have in my Win32 API reference:

    Code:
    LONG RegSetValueEx(
    
        HKEY hKey,	// handle of key to set value for  
        LPCTSTR lpValueName,	// address of value to set 
        DWORD Reserved,	// reserved 
        DWORD dwType,	// flag for value type 
        CONST BYTE *lpData,	// address of value data 
        DWORD cbData 	// size of value data 
       );	
    Parameters
    
    hKey
    
    Identifies a currently open key or any of the following predefined reserved handle values: 
    
    HKEY_CLASSES_ROOT
    HKEY_CURRENT_USER
    HKEY_LOCAL_MACHINE
    HKEY_USERS
    
    lpValueName
    
    Points to a string containing the name of the value to set. If a value with this name is not already present in the key, the function adds it to the key. 
    
    If this parameter is NULL or points to an empty string and the dwType parameter is the REG_SZ type, this function sets the same value the RegSetValue function would set. 
    
    Reserved
    
    Reserved; must be zero. 
    
    dwType
    
    Specifies the type of information to be stored as the values data. This parameter can be one of the following values: 
    
    Value	Meaning
    REG_BINARY	Binary data in any form.
    REG_DWORD	A 32-bit number.
    REG_DWORD_LITTLE_ENDIAN	A 32-bit number in little-endian format (same as REG_DWORD). In little-endian format, the most significant byte of a word is the high-order byte. This is the most common format for computers running Windows NT and Windows 95.
    REG_DWORD_BIG_ENDIAN	A 32-bit number in big-endian format. In big-endian format, the most significant byte of a word is the low-order byte.
    REG_EXPAND_SZ	A null-terminated string that contains unexpanded references to environment variables (for example, %PATH%). It will be a Unicode or ANSI string depending on whether you use the Unicode or ANSI functions.
    REG_LINK	A Unicode symbolic link.
    REG_MULTI_SZ	An array of null-terminated strings, terminated by two null characters.
    REG_NONE	No defined value type.
    REG_RESOURCE_LIST	A device-driver resource list.
    REG_SZ	A null-terminated string. It will be a Unicode or ANSI string depending on whether you use the Unicode or ANSI functions.
    lpData
    
    Points to a buffer containing the data to be stored with the specified value name. 
    
    cbData
    
    Specifies the size, in bytes, of the information pointed to by the lpData parameter. If the data is of type REG_SZ, REG_EXPAND_SZ, or REG_MULTI_SZ, cbData must include the size of the terminating null character. 
    
    Return Values
    
    If the function succeeds, the return value is ERROR_SUCCESS.
    If the function fails, the return value is a nonzero error code defined in WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.
    
    Remarks
    
    Value lengths are limited by available memory. Long values (more than 2048 bytes) should be stored as files with the filenames stored in the registry. This helps the registry perform efficiently. Application elements such as icons, bitmaps, and executable files should be stored as files and not be placed in the registry. 
    The key identified by the hKey parameter must have been opened with KEY_SET_VALUE access. To open the key, use the RegCreateKeyEx or RegOpenKeyEx function. 
    
    If dwType is the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type and the ANSI version of this function is used (either by explicitly calling RegSetValueEx or by not defining Unicode before including the WINDOWS.H file), the data pointed to by the lpData parameter must be an ANSI character string. The string is converted to Unicode before it is stored in the registry.
    Hope this helps!

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