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 =http://www.mamicode.com/ 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 =http://www.mamicode.com/ 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_SUCCESS101 //      )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_SUCCESS118       )119    {120       QueryKey(hTestKey);121    }122    123    RegCloseKey(hTestKey);124 }