RegQueryValueEx理解

RegQueryValueEx(hKey,L"DeviceArrayIndex",NULL,&kvaluetype,(LPBYTE)&pSerialHead->dwPortIndex,&datasize)
 
RegQueryValueEx找回所打开注册表键所关联的一个给定值的类型和数据。 
LONG RegQueryValueEx(   HKEY hKey,           // 要查询键的句柄LPTSTR lpValueName,  // 要查询值的名字的地址LPDWORD lpReserved,  // 保留LPDWORD lpType, 
     // 值类型缓存地址LPBYTE lpData,       // 数据缓存地址LPDWORD lpcbData     // 数据缓存大小地址);实例：RegQueryValueEx 获取注册表中指定的键值​​LONG RegQueryValueEx( 
 HKEY hKey, // handle to key to query 
 LPTSTR lpValueName, // address of name of value to query 
 LPDWORD lpReserved, // reserved 
 LPDWORD lpType, // address of buffer for value type 
 LPBYTE lpData, // address of data buffer 
 LPDWORD lpcbData // address of data buffer size 
 ); ​​
 
 
​​如下：
 LPCTSTR key= "Software\\Microsoft\\GPS"; ​​
​
 HKEY hkey; 

 long lret; 
 DWORD dwVal; 
 DWORD WordType = REG_SZ; 
 DWORD WordData =100; 
 long ret=RegOpenKeyEx(HKEY_LOCAL_MACHINE,key,0,KEY_READ,&hkey); 

 lret = RegQueryValueEx(hkey,key,NULL,&WordType,(LPBYTE)&dwVal,&WordData); 
​