Windows API - RegEnumValue

  1 #include <windows.h>
  2 #include <stdio.h>
  3 #include <tchar.h>
  4
  5 #define MAX_KEY_LENGTH 255
  6 #define MAX_VALUE_NAME 16383
  7
  8 void QueryKey(HKEY hKey)
  9 {
 10     TCHAR    achKey[MAX_KEY_LENGTH];   // buffer for subkey name
 11     DWORD    cbName;                   // size of name string
 12     TCHAR    achClass[MAX_PATH] = TEXT("");  // buffer for class name
 13     DWORD    cchClassName = MAX_PATH;  // size of class string
 14     DWORD    cSubKeys=0;               // number of subkeys
 15     DWORD    cbMaxSubKey;              // longest subkey size
 16     DWORD    cchMaxClass;              // longest class string
 17     DWORD    cValues;              // number of values for key
 18     DWORD    cchMaxValue;          // longest value name
 19     DWORD    cbMaxValueData;       // longest value data
 20     DWORD    cbSecurityDescriptor; // size of security descriptor
 21     FILETIME ftLastWriteTime;      // last write time
 22
 23     DWORD i, retCode;
 24
 25     TCHAR  achValue[MAX_VALUE_NAME];
 26     DWORD cchValue = MAX_VALUE_NAME;
 27
 28     // Get the class name and the value count.
 29     retCode = RegQueryInfoKey(
 30         hKey,                    // key handle
 31         achClass,                // buffer for class name
 32         &cchClassName,           // size of class string
 33         NULL,                    // reserved
 34         &cSubKeys,               // number of subkeys
 35         &cbMaxSubKey,            // longest subkey size
 36         &cchMaxClass,            // longest class string
 37         &cValues,                // number of values for this key
 38         &cchMaxValue,            // longest value name
 39         &cbMaxValueData,         // longest value data
 40         &cbSecurityDescriptor,   // security descriptor
 41         &ftLastWriteTime);       // last write time
 42
 43     // Enumerate the subkeys, until RegEnumKeyEx fails.
 44
 45     if (cSubKeys)
 46     {
 47         printf( "\nNumber of subkeys: %d\n", cSubKeys);
 48
 49         for (i=0; i<cSubKeys; i++)
 50         {
 51             cbName = MAX_KEY_LENGTH;
 52             retCode = RegEnumKeyEx(hKey, i,
 53                      achKey,
 54                      &cbName,
 55                      NULL,
 56                      NULL,
 57                      NULL,
 58                      &ftLastWriteTime);
 59             if (retCode == ERROR_SUCCESS)
 60             {
 61                 _tprintf(TEXT("(%d) %s\n"), i+1, achKey);
 62             }
 63         }
 64     }
 65
 66     // Enumerate the key values.
 67
 68     if (cValues)
 69     {
 70         printf( "\nNumber of values: %d\n", cValues);
 71
 72         for (i=0, retCode=ERROR_SUCCESS; i<cValues; i++)
 73         {
 74             cchValue = MAX_VALUE_NAME;
 75             achValue[0] = ‘\0‘;
 76             retCode = RegEnumValue(hKey, i,
 77                 achValue,
 78                 &cchValue,
 79                 NULL,
 80                 NULL,
 81                 NULL,
 82                 NULL);
 83
 84             if (retCode == ERROR_SUCCESS )
 85             {
 86                 _tprintf(TEXT("(%d) %s\n"), i+1, achValue);
 87             }
 88         }
 89     }
 90 }
 91
 92 //void __cdecl _tmain(void)
 93 //{
 94 //   HKEY hTestKey;
 95 //
 96 //   if( RegOpenKeyEx( HKEY_LOCAL_MACHINE,
 97 //        TEXT("SOFTWARE\\Autodesk"),
 98 //        0,
 99 //        KEY_READ,
100 //        &hTestKey) == ERROR_SUCCESS
101 //      )
102 //   {
103 //      QueryKey(hTestKey);
104 //   }
105 //
106 //   RegCloseKey(hTestKey);
107 //}
108
109 //int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
110 int main(){
111    HKEY hTestKey;
112
113    if( RegOpenKeyEx( HKEY_LOCAL_MACHINE,
114         TEXT("SOFTWARE\\Autodesk"),
115         0,
116         KEY_READ,
117         &hTestKey) == ERROR_SUCCESS
118       )
119    {
120       QueryKey(hTestKey);
121    }
122
123    RegCloseKey(hTestKey);
124 }