注册表Demo

一、获取安装程序信息

  1 #include <windows.h>
  2 #include <iostream>
  3 #include <string>
  4 #include <vector>
  5 
  6 using namespace std;
  7 
  8 //记录安装软件信息的结构体
  9 struct ApplicationInfoA 
 10 {
 11     string strName;                //软件名
 12     string strDisplayName;        //显示的软件名
 13     string strPublisher;        //发布者
 14     string strVersion;            //版本
 15     string strDisPlayVersion;    //显示的版本
 16     string strInstallLocation;    //安装的位置
 17 };
 18 
 19 int GetAppInfoA(HKEY hKey, LPCSTR lpszAppName, LPCSTR lpszKeyValueName, string &strKeyValue)
 20 {
 21     int iRet;
 22     HKEY hInstallAppKey;
 23 
 24     iRet = RegOpenKeyExA(hKey, lpszAppName, 0, KEY_ALL_ACCESS, &hInstallAppKey);
 25     if (iRet != ERROR_SUCCESS)
 26     {
 27         return -1;
 28     }
 29 
 30     DWORD dwKeyValueType = REG_SZ;
 31     DWORD dwKeyValueDataSize = 0;
 32 
 33     iRet = RegQueryValueExA(hInstallAppKey, lpszKeyValueName, NULL, &dwKeyValueType, NULL, &dwKeyValueDataSize);
 34     if (iRet == ERROR_FILE_NOT_FOUND)
 35     {
 36         RegCloseKey(hInstallAppKey);
 37         return 0;
 38     }
 39     else if (iRet != ERROR_SUCCESS)
 40     {
 41         RegCloseKey(hInstallAppKey);
 42         return -1;
 43     }
 44 
 45     if (dwKeyValueType != REG_SZ)
 46     {
 47         RegCloseKey(hInstallAppKey);
 48         return 0;
 49     }
 50 
 51     LPSTR lpszKeyValueData = new char[dwKeyValueDataSize + 1];
 52     memset(lpszKeyValueData, 0, dwKeyValueDataSize + 1);
 53 
 54     iRet = RegQueryValueExA(hInstallAppKey, lpszKeyValueName, NULL, &dwKeyValueType, (LPBYTE)lpszKeyValueData, &dwKeyValueDataSize);
 55     if (iRet != ERROR_SUCCESS)
 56     {
 57         delete []lpszKeyValueData;
 58         RegCloseKey(hInstallAppKey);
 59         return -1;
 60     }
 61 
 62     strKeyValue = lpszKeyValueData;
 63     delete []lpszKeyValueData;
 64     RegCloseKey(hInstallAppKey);
 65 
 66     return 0;
 67 }
 68 
 69 int GetAllInstalledAppInfoA(vector<ApplicationInfoA> &vecAppInfo)
 70 {
 71     int iRet;
 72     HKEY hKey;
 73     LPCSTR lpszSubKey = "SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
 74     iRet = RegOpenKeyExA(HKEY_LOCAL_MACHINE, lpszSubKey, 0, KEY_ALL_ACCESS, &hKey);
 75     if (iRet != ERROR_SUCCESS)
 76     {
 77         return -1;
 78     }
 79 
 80     DWORD dwSubKeysCnt;
 81     DWORD dwMaxSubKeyNameLen;
 82     DWORD dwKeyValueCnt;
 83     DWORD dwMaxKeyValueNameLen;
 84     DWORD dwMaxKeyValueDataLen;
 85 
 86     iRet = RegQueryInfoKeyA(
 87         hKey, 
 88         NULL, 
 89         NULL, 
 90         NULL, 
 91         &dwSubKeysCnt,
 92         &dwMaxSubKeyNameLen, 
 93         NULL, 
 94         &dwKeyValueCnt, 
 95         &dwMaxKeyValueNameLen, 
 96         &dwMaxKeyValueDataLen, 
 97         NULL, 
 98         NULL);
 99     if (iRet != ERROR_SUCCESS)
100     {
101         RegCloseKey(hKey);
102         return -1;
103     }
104 
105     DWORD dwIndex;
106     DWORD dwNameLen = dwMaxSubKeyNameLen + 1;
107     LPSTR lpszSubKeyName = new char[dwNameLen];
108 
109     for (dwIndex = 0; dwIndex < dwSubKeysCnt; ++dwIndex)
110     {
111         dwNameLen = dwMaxSubKeyNameLen + 1;
112         memset(lpszSubKeyName, 0, dwNameLen);
113 
114         iRet = RegEnumKeyExA(hKey, dwIndex, lpszSubKeyName, &dwNameLen, NULL, NULL, NULL, NULL);
115         if (iRet != ERROR_SUCCESS)
116         {
117             RegCloseKey(hKey);
118             delete []lpszSubKeyName;
119             return -1;
120         }
121 
122         ApplicationInfoA appInfo;
123         appInfo.strName = lpszSubKeyName;
124         GetAppInfoA(hKey, lpszSubKeyName, "DisplayName", appInfo.strDisplayName);
125         GetAppInfoA(hKey, lpszSubKeyName, "Publisher", appInfo.strPublisher);
126         GetAppInfoA(hKey, lpszSubKeyName, "Version", appInfo.strVersion);
127         GetAppInfoA(hKey, lpszSubKeyName, "DisplayVersion", appInfo.strDisPlayVersion);
128         GetAppInfoA(hKey, lpszSubKeyName, "InstallLocation", appInfo.strInstallLocation);
129         vecAppInfo.push_back(appInfo);
130     }
131 
132     delete []lpszSubKeyName;
133     RegCloseKey(hKey);
134 
135     return 0;
136 }
137 
138 int main(int argc, char **argv)
139 {
140     cout << "Application Information" << endl;
141 
142     vector<ApplicationInfoA> vecAppInfo;
143     cout << GetAllInstalledAppInfoA(vecAppInfo) << endl;
144 
145     for (vector<ApplicationInfoA>::const_iterator iter = vecAppInfo.begin(); iter != vecAppInfo.end(); ++iter)
146     {
147         cout << "-------------------------------------------------------------------------------" << endl;
148         cout << "Name:" << iter->strName << endl;
149         cout << "DisplayName:" << iter->strDisplayName << endl;
150         cout << "Publisher:" << iter->strPublisher << endl;
151         cout << "Version:" << iter->strVersion << endl;
152         cout << "DisplayVersion:" << iter->strDisPlayVersion << endl;
153         cout << "InstallLocation:" << iter->strInstallLocation << endl;
154         cout << "-------------------------------------------------------------------------------" << endl;
155         cout << endl;
156         cout << endl;
157     }
158     
159     return 0;
160 }

二、添加环境变量

 1 #define _CRT_SECURE_NO_WARNINGS
 2 
 3 #include <windows.h>
 4 #include <iostream>
 5 #include <string>
 6 
 7 using namespace std;
 8 
 9 int AddPathEnvValue(LPCSTR lpszPathValue)
10 {
11     int iRet;
12     HKEY hKey;
13     LPCSTR lpszSubKey = "SYSTEM\CurrentControlSet\Control\Session Manager\Environment";
14 
15     iRet = RegOpenKeyExA(HKEY_LOCAL_MACHINE, lpszSubKey, 0, KEY_ALL_ACCESS, &hKey);
16     if (ERROR_SUCCESS != iRet)
17     {
18         cout << "RegOpenKeyExA Error!" << endl;
19         return -1;
20     }
21 
22     LPCSTR lpszKeyValueName = "Path";
23     DWORD dwKeyValueType = REG_EXPAND_SZ;
24     DWORD dwKeyValueDataSize = 0;
25 
26     iRet = RegQueryValueExA(hKey, lpszKeyValueName, NULL, &dwKeyValueType, NULL, &dwKeyValueDataSize);
27     if (ERROR_FILE_NOT_FOUND != iRet)
28     {
29         iRet = RegSetValueExA(hKey, lpszKeyValueName, 0, REG_EXPAND_SZ, (const BYTE*)"", 1);
30         if (ERROR_SUCCESS != iRet)
31         {
32             cout << "RegSetValueExA Error!" << endl;
33             RegCloseKey(hKey);
34             return -1;
35         }
36     }
37     else if (ERROR_SUCCESS != iRet)
38     {
39         cout << "RegSetValueExA Error!" << endl;
40         RegCloseKey(hKey);
41         return -1;
42     }
43     else if (REG_EXPAND_SZ != dwKeyValueType)
44     {
45         cout << "It is impossible!" << endl;
46         cout << dwKeyValueType << endl;
47         RegCloseKey(hKey);
48         return -1;
49     }
50 
51     char *lpszKeyValueData = new char[dwKeyValueDataSize + 1];
52     memset(lpszKeyValueData, 0, dwKeyValueDataSize + 1);
53 
54     iRet = RegQueryValueExA(hKey, lpszKeyValueName, NULL, &dwKeyValueType, (LPBYTE)lpszKeyValueData, &dwKeyValueDataSize);
55     if (ERROR_SUCCESS != iRet)
56     {
57         cout << "RegQueryValueExA Error!" << endl;
58         RegCloseKey(hKey);
59         delete []lpszKeyValueData;
60         return -1;
61     }
62 
63     unsigned int iLen = strlen(lpszPathValue);
64     iLen += strlen(lpszKeyValueData);
65     char *lpszKeyValueData_New = new char[iLen + 1];
66     memset(lpszKeyValueData_New, 0, iLen + 1);
67     sprintf(lpszKeyValueData_New, "%s%s", lpszKeyValueData, lpszPathValue);
68     iRet = RegSetValueExA(hKey, lpszKeyValueName, 0, REG_EXPAND_SZ, (const BYTE*)lpszKeyValueData_New, iLen + 1);
69     if (ERROR_SUCCESS != iRet)
70     {
71         cout << "RegSetValueExA Error!" << endl;
72         RegCloseKey(hKey);
73         delete []lpszKeyValueData;
74         delete []lpszKeyValueData_New;
75         return -1;
76     }
77 
78     delete []lpszKeyValueData_New;
79     delete []lpszKeyValueData;
80 
81     RegCloseKey(hKey);
82 
83     return 0;
84 }
85 
86 int main(int argc, char *argv)
87 {
88     cout << AddPathEnvValue(";HelloKitty") << endl;
89     return 0;
90 }

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原文地址：https://www.cnblogs.com/qiyueliuguang/p/3496610.html