C++ 读取REG_SZ 、REG_DWORD 、REG_MULTI_SZ 类型注册表值

  1. 读取REG_SZ 类型的注册表键值

     1 // 读取 REG_SZ 类型键值的代码
 2 
 3 HKEY  hKey       = NULL;
 4 DWORD dwSize     = 0;
 5 DWORD dwDataType = 0;
 6 LPBYTE lpValue   = NULL;
 7 LPCTSTR const lpValueName = _T("TcpPort");
 8 
 9 LONG lRet = ::RegOpenKeyEx(HKEY_LOCAL_MACHINE,
10    _T("SOFTWARE\Microsoft\MSSQLServer\MSSQLServer\SuperSocketNetLib\Tcp"),
11    0,
12    KEY_QUERY_VALUE,
13    &hKey);
14 if(ERROR_SUCCESS != lRet)
15 {
16    // Error handling (see this FAQ)
17    // return;
18 }
19 // Call once RegQueryValueEx to retrieve the necessary buffer size
20 ::RegQueryValueEx(hKey, 
21    lpValueName,
22    0,
23    &dwDataType,
24    lpValue,  // NULL
25    &dwSize); // will contain the data size
26 
27 // Alloc the buffer
28 lpValue = (LPBYTE)malloc(dwSize);
29 
30 // Call twice RegQueryValueEx to get the value
31 lRet = ::RegQueryValueEx(hKey, 
32    lpValueName,
33    0,
34    &dwDataType,
35    lpValue,
36    &dwSize);
37 ::RegCloseKey(hKey);
38 if(ERROR_SUCCESS != lRet)
39 {
40    // Error handling
41    // return;
42 }
43 // Enjoy of lpValue...
44 cout << "port ----------------------- " << lpValue << endl;
45 
46 // free the buffer when no more necessary
47 free(lpValue);
48 
49 // 此段代码来源：http://forums.codeguru.com/showthread.php?247020-Windows-SDK-Registry-How-can-I-read-data-from-the-registry&s=
    View Code

  2. 读取REG_DWORD 类型的注册表键值

     1 // 读取 REG_DWORD 类型的注册表键值代码
 2 
 3 long lRet;
 4 HKEY hKey;
 5 DWORD port;
 6 DWORD dwType = REG_DWORD;
 7 DWORD dwValue;
 8 lRet = RegOpenKeyEx(
 9            HKEY_LOCAL_MACHINE,
10            "SOFTWARE\Microsoft\MSSQLServer\Client\SuperSocketNetLib\Tcp",
11            0,
12            KEY_QUERY_VALUE,
13            &hKey
14        );    //打开注册表
15 if(lRet == ERROR_SUCCESS)//读操作成功
16 {
17     lRet = RegQueryValueEx(
18                hKey,
19                "DefaultPort",
20                0,
21                &dwType,
22                (LPBYTE)&port,
23                &dwValue
24            );    //如果打开成功，则读
25     if(lRet == ERROR_SUCCESS)
26     {
27         printf("
打开成功，则读:");
28         cout << "DefaultPort: " << port << endl;
29         //mcfile << "DefaultPort: " << port << endl;
30         mcfile << "<port>" << port << "</port>" << endl;
31     }
32     //以下是读取失败
33     else
34     {
35         printf("
读取失败:");
36     }
37 
38 }
39 //以下是打开失败
40 else
41 {
42     printf("
打开失败:");
43 }
44 RegCloseKey(hKey);//记住，一定要关闭
    View Code

  3. 读取REG_MULTI_SZ 类型的注册表键值

      1 #include "windows.h"
  2 #include "tchar.h"
  3 #include "conio.h"
  4 #include "stdio.h"
  5 
  6 #define MY_KEY _T("PathToMyRegistryKey\MyRegistryKey") // Registry key
  7 #define MY_VALUES _T("NameOfTheREG_MULTI_SZListOfValues") // Registry values
  8 #define NEW_VALUE _T("MyNewValue") // New value
  9 #define FIND_VALUE _T("AnExistingValue") // We will insert the new value after this one
 10 
 11 int _tmain(int argc, _TCHAR* argv[])
 12 {
 13     LONG lResult = 0;
 14     HKEY hKey = NULL;
 15     LPTSTR lpValues = NULL;
 16     LPTSTR lpValue = NULL;
 17     LPTSTR lpNewValues = NULL;
 18     LPTSTR lpNewValue = NULL;
 19     DWORD cbValues = 0;
 20     DWORD cbNewValues = 0;
 21     DWORD cbNewValue = 0;
 22     BOOL bFound = FALSE;
 23 
 24     __try 
 25     {
 26         // OPEN THE REGISTRY KEY
 27         //
 28         _tprintf(_T("RegOpenKeyEx..."));
 29         lResult = RegOpenKeyEx(
 30             HKEY_LOCAL_MACHINE, 
 31             MY_KEY, 
 32             0,
 33             KEY_ALL_ACCESS,
 34             &hKey
 35         );
 36         if (ERROR_SUCCESS != lResult) { _tprintf(_T("ERROR 0x%x
"), lResult); return 1; } 
 37         _tprintf(_T("SUCCESS
"));
 38 
 39         // READ THE REG_MULTI_SZ VALUES
 40         //
 41         // Get size of the buffer for the values
 42         _tprintf(_T("RegQueryValueEx..."));
 43         lResult = RegQueryValueEx(
 44             hKey,
 45             MY_VALUES,
 46             NULL,
 47             NULL,
 48             NULL,
 49             &cbValues
 50         );
 51         if (ERROR_SUCCESS != lResult) { _tprintf(_T("ERROR 0x%x
"), lResult); return 1; } 
 52         _tprintf(_T("SUCCESS
"));
 53 
 54         // Allocate the buffer
 55         _tprintf(_T("malloc..."));
 56         lpValues = (LPTSTR)malloc(cbValues);
 57         if (NULL == lpValues) { _tprintf(_T("ERROR 0x%x
"), GetLastError()); return 1; } 
 58         _tprintf(_T("SUCCESS
"));
 59 
 60         // Get the values
 61         _tprintf(_T("RegQueryValueEx..."));
 62         lResult = RegQueryValueEx(
 63             hKey,
 64             MY_VALUES, 
 65             NULL,
 66             NULL,
 67             (LPBYTE)lpValues,
 68             &cbValues
 69         );
 70         if (ERROR_SUCCESS != lResult) { _tprintf(_T("ERROR 0x%x
"), lResult); return 1; } 
 71         _tprintf(_T("SUCCESS
"));
 72 
 73         // SHOW THE VALUES
 74         //
 75         _tprintf(_T("
**************************
"));
 76         _tprintf(_T("OLD VALUES
"));
 77         _tprintf(_T("**************************

"));
 78         lpValue = lpValues;
 79         for (; '' != *lpValue; lpValue += _tcslen(lpValue) + 1)
 80         {
 81             // Show one value
 82             _tprintf(_T("%s
"), lpValue);
 83         }
 84         _tprintf(_T("
**************************

"));
 85 
 86         // INSERT A NEW VALUE AFTER A SPECIFIC VALUE IN THE LIST OF VALUES
 87         //
 88         // Allocate a new buffer for the old values plus the new one
 89         _tprintf(_T("malloc..."));
 90         cbNewValue = (_tcslen(NEW_VALUE) + 1) * sizeof(TCHAR);
 91         cbNewValues = cbValues + cbNewValue;
 92         lpNewValues = (LPTSTR)malloc(cbNewValues);
 93         if (NULL == lpNewValues) { _tprintf(_T("ERROR 0x%x
"), GetLastError()); return 1; } 
 94         _tprintf(_T("SUCCESS
"));        
 95 
 96         // Find the value after which we will insert the new one
 97         lpValue = lpValues;
 98         lpNewValue = lpNewValues;
 99         bFound = FALSE;
100         for (; '' != *lpValue; lpValue += _tcslen(lpValue) + 1)
101         {
102             // Copy the current value to the target buffer
103             memcpy(lpNewValue, lpValue, (_tcslen(lpValue) + 1) * sizeof(TCHAR));
104 
105             if (0 == _tcscmp(lpValue, FIND_VALUE))
106             {
107                 // The current value is the one we wanted to find
108                 bFound = TRUE;
109 
110                 // Copy the new value to the target buffer
111                 lpNewValue += _tcslen(lpValue) + 1;
112                 memcpy(lpNewValue, NEW_VALUE, (_tcslen(NEW_VALUE) + 1) * sizeof(TCHAR));
113                 lpNewValue += _tcslen(NEW_VALUE) + 1;
114             }
115             else
116             {
117                 // This is not the value we want, continue to the next one
118                 lpNewValue += _tcslen(lpValue) + 1;
119             }
120         }
121         if (!bFound) 
122         { 
123             // We didn't find the value we wanted. Insert the new value at the end
124             memcpy(lpNewValue, NEW_VALUE, (_tcslen(NEW_VALUE) + 1) * sizeof(TCHAR));
125             lpNewValue += _tcslen(NEW_VALUE) + 1;
126         }
127         *lpNewValue = *lpValue;
128 
129         // SHOW THE NEW VALUES
130         //
131         _tprintf(_T("
**************************
"));
132         _tprintf(_T("NEW VALUES
"));
133         _tprintf(_T("**************************

"));
134         lpNewValue = lpNewValues;
135         for (; '' != *lpNewValue; lpNewValue += _tcslen(lpNewValue) + 1)
136         {
137             // Show one value
138             _tprintf(_T("%s
"), lpNewValue);
139         }
140         _tprintf(_T("
**************************

"));
141 
142         // WRITE THE NEW VALUES BACK TO THE KEY
143         //
144         _tprintf(_T("RegSetValueEx..."));
145         lResult = RegSetValueEx(
146             hKey,
147             MY_VALUES, 
148             NULL,
149             REG_MULTI_SZ,
150             (LPBYTE)lpNewValues,
151             cbNewValues
152         );
153         if (ERROR_SUCCESS != lResult) { _tprintf(_T("ERROR 0x%x
"), lResult); return 1; } 
154         _tprintf(_T("SUCCESS
"));
155     }
156     __finally
157     {
158         // Clean up    
159         //
160         if (NULL != lpValues) { free(lpValues); }
161         if (NULL != lpNewValues) { free(lpNewValues); }
162         if (NULL != hKey) { RegCloseKey(hKey); }
163 
164         //_tprintf(_T("
<<PRESS ANY KEY>>
"));
165         //_getch();
166     }
167 
168     return 0;
169 }
170 
171 // 此模板来自http://blogs.msdn.com/b/alejacma/archive/2009/11/12/how-to-manipulate-reg-multi-sz-values-from-the-registry-c.aspx
    View Code

 

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原文地址：https://www.cnblogs.com/duanguyuan/p/4320604.html