from msdn.microsoft.com - Enumerating Registry Subkeys:
http://msdn.microsoft.com/En-US/library/ms724256.aspx
// QueryKey - Enumerates the subkeys of key and its associated values.
// hKey - Key whose subkeys and values are to be enumerated.
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#define MAX_KEY_LENGTH 255
#define MAX_VALUE_NAME 16383
void QueryKey(HKEY hKey)
{
TCHAR achKey[MAX_KEY_LENGTH]; // buffer for subkey name
DWORD cbName; // size of name string
TCHAR achClass[MAX_PATH] = TEXT(""); // buffer for class name
DWORD cchClassName = MAX_PATH; // size of class string
DWORD cSubKeys=0; // number of subkeys
DWORD cbMaxSubKey; // longest subkey size
DWORD cchMaxClass; // longest class string
DWORD cValues; // number of values for key
DWORD cchMaxValue; // longest value name
DWORD cbMaxValueData; // longest value data
DWORD cbSecurityDescriptor; // size of security descriptor
FILETIME ftLastWriteTime; // last write time
DWORD i, retCode;
TCHAR achValue[MAX_VALUE_NAME];
DWORD cchValue = MAX_VALUE_NAME;
// Get the class name and the value count.
retCode = RegQueryInfoKey(
hKey, // key handle
achClass, // buffer for class name
&cchClassName, // size of class string
NULL, // reserved
&cSubKeys, // number of subkeys
&cbMaxSubKey, // longest subkey size
&cchMaxClass, // longest class string
&cValues, // number of values for this key
&cchMaxValue, // longest value name
&cbMaxValueData, // longest value data
&cbSecurityDescriptor, // security descriptor
&ftLastWriteTime); // last write time
// Enumerate the subkeys, until RegEnumKeyEx fails.
if (cSubKeys)
{
printf( "\nNumber of subkeys: %d\n", cSubKeys);
for (i=0; i<cSubKeys; i++)
{
cbName = MAX_KEY_LENGTH;
retCode = RegEnumKeyEx(hKey, i,
achKey,
&cbName,
NULL,
NULL,
NULL,
&ftLastWriteTime);
if (retCode == ERROR_SUCCESS)
{
_tprintf(TEXT("(%d) %s\n"), i+1, achKey);
}
}
}
// Enumerate the key values.
if (cValues)
{
printf( "\nNumber of values: %d\n", cValues);
for (i=0, retCode=ERROR_SUCCESS; i<cValues; i++)
{
cchValue = MAX_VALUE_NAME;
achValue[0] = '\0';
retCode = RegEnumValue(hKey, i,
achValue,
&cchValue,
NULL,
NULL,
NULL,
NULL);
if (retCode == ERROR_SUCCESS )
{
_tprintf(TEXT("(%d) %s\n"), i+1, achValue);
}
}
}
}
void __cdecl _tmain(void)
{
HKEY hTestKey;
if( RegOpenKeyEx( HKEY_CURRENT_USER,
TEXT("SOFTWARE\\Microsoft"),
0,
KEY_READ,
&hTestKey) == ERROR_SUCCESS
)
{
QueryKey(hTestKey);
}
RegCloseKey(hTestKey);
}
how can i modify that code at:
cchValue = MAX_VALUE_NAME;
achValue[0] = '\0';
retCode = RegEnumValue(hKey, i,
achValue,
&cchValue,
NULL,
NULL,
NULL,
NULL);
if (retCode == ERROR_SUCCESS )
{
_tprintf(TEXT("(%d) %s\n"), i+1, achValue);
}
to output to the console all the values that RegEnumValue function can return, function at msdn: http://msdn.microsoft.com/en-us/library/windows/desktop/ms724865%28v=vs.85%29.aspx i want to output these vars too:
__out LPTSTR lpValueName,
__inout LPDWORD lpcchValueName,
__out_opt LPDWORD lpType,
__out_opt LPBYTE lpData,
__inout_opt LPDWORD lpcbData
i have tried different things but everytime i change any of NULL var from that function:
retCode = RegEnumValue(hKey, i, achValue, &cchValue, NULL, NULL, NULL, NULL);
i even don´t get achValue
thanks a lot
PD using windows 7 64 bits visual studio 2010 ultimate
The first of the four NULL values is lpReserved and must be set to NULL.
The second one is lpType and you should be able to get that one by itself.
The third and fourth are paired and must either be set to NULL or both non-NULL. They function much like achValue and cchValue where the first is the buffer to recieve the data and the second is a pointer to the size that must first have the size of the buffer and then gets filled in with the size of the data.
The following code works on my Vista machine:
const DWORD maxValueBytes=300;
BYTE valueBytes[maxValueBytes];
DWORD valueSize=maxValueBytes;
DWORD valueType=0;
cchValue = MAX_VALUE_NAME;
achValue[0] = '\0';
retCode = RegEnumValue(hKey, i,
achValue,
&cchValue,
NULL,
&valueType,
valueBytes,
&valueSize);
if (retCode == ERROR_SUCCESS )
{
_tprintf(TEXT("(%d) %s (%d - %d bytes)\n"), i+1, achValue,valueType,valueSize);
switch (valueType) {
case REG_BINARY:
_tprintf(TEXT(" The value is binary (0x%X, 0x%X, 0x%X ...)\n"),valueBytes[0],valueBytes[1],valueBytes[2]);
break;
case REG_DWORD:
//case REG_DWORD_LITTLE_ENDIAN:
_tprintf(TEXT(" The value is a DWORD (%d)\n"),*(DWORD *)valueBytes);
break;
case REG_DWORD_BIG_ENDIAN:
_tprintf(TEXT(" The value is a DWORD (big endian) (%d)\n"),(valueBytes[0]<<24)|(valueBytes[1]<<16)|(valueBytes[2]<<8)|valueBytes[3]);
break;
case REG_EXPAND_SZ:
case REG_SZ:
_tprintf(TEXT(" The value is a string\n"));
break;
case REG_LINK:
_tprintf(TEXT(" The value is a link\n"));
break;
case REG_MULTI_SZ:
_tprintf(TEXT(" The value is a multi-string\n"));
break;
case REG_NONE:
_tprintf(TEXT(" There is no spoon... sorry, value\n"));
break;
case REG_RESOURCE_LIST:
_tprintf(TEXT(" The value is a resource list\n"));
break;
default:
_tprintf(TEXT(" Unknown value type\n"));
break;
}
}
else
{
_tprintf(TEXT("error reading value %d - %d\n"),i+1,retCode);
}