Registry Operation Summary

Example 1: Read the registry to obtain information about programs installed on the computer. In Windows, you can obtain information about the installer in the Registry HKEY_LOCAL_MACHINE \ SoftWare \ Microsoft \ Windows \ CurrentVersion \ Uninstall, in addition, xp, vista, win7, and win8 are all the same in the following example program: The structure ApplicationInfoA is used to record the specific information of each Installer. As to why A is added after the name, it is mainly used to indicate that all the information under it is recorded with a string. The GetAllInstalledAppInfoA function is used to obtain all information about the installed program on the computer. It accepts the parameter of the vector <ApplicationInfoA> reference type and stores all information in the vector. If the program is successfully executed, 0 is returned. If the program fails to be executed,-1 is returned. The main () function demonstrates how to use: vector <ApplicationInfoA> vAppInfo; GetAllInstalledAppInfoA (vAppInfo); after obtaining the information of the installer, output to the installedappinfo.txt file in the ddrive. [Cpp] # include <windows. h> # include <iostream> # include <TCHAR. H ># include <vector> using namespace std; /// structure used to record Installation Software Information // struct ApplicationInfoA {string strName; // software name string strDisplayName; // display the software name string strPublisher; // publisher string strVersion; // version string strDisplayVersion; // display version string strInstallLocation; // installation location }; //// obtain the key value of a specific program Data // hKey [in] // --- pointing to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall sub-key handle // lpszKeyValueName [in] // --- the sub-key name under hKey // lpszKeyValueName [in] // --- just like its name, key Value Name // strKeyValue [out] // --- key value Data // int _ GetAppInfoA _ (HKEY hKey, LPCSTR lpszAppName, LPCSTR lpszKeyValueName, string & strKeyValue) {int ret; // open the registry key of the installed software ---------------------------------------------- HKEY hInstallAppKey; ret = RegOpenKeyEx (hKey, l PszAppName, 0, KEY_ALL_ACCESS, & hInstallAppKey); if (ret! = ERROR_SUCCESS) {return-1;} // obtain the key of the registry key of the installed software ---------------------------------------- // 1. obtain the string size (REG_SZ by default) DWORD dwKeyValueType = REG_SZ; DWORD dwKeyValueDataSize = 0; ret = values (hInstallAppKey, lpszKeyValueName, NULL, & dwKeyValueType, NULL, & dwKeyValueDataSize ); if (ret = ERROR_FILE_NOT_FOUND) {RegCloseKey (hInstallAppKey); return 0;} else if (ret! = ERROR_SUCCESS) {RegCloseKey (hInstallAppKey); return-1 ;}// 2. Obtain the string value if (dwKeyValueType! = REG_SZ) // if it is not of the string type, it is returned. Some installer items are not of the string type but other types. Ignore {RegCloseKey (hInstallAppKey); return 0 ;} LPSTR values = new char [dwKeyValueDataSize + 1]; memset (values, 0, dwKeyValueDataSize + 1); ret = values (hInstallAppKey, lpszKeyValueName, NULL, & dwKeyValueType, (LPBYTE) values, & dwKeyValueDataSize); if (ret! = ERROR_SUCCESS) {delete [] lpszKeyValueData; RegCloseKey (hInstallAppKey); return-1 ;}strkeyvalue = lpszKeyValueData; delete [] secret; // disable registry key secret RegCloseKey ); return 0 ;} //// obtain information about the program installed by the system and store it in the vector parameter. // if the execution succeeds, 0 is returned. // if the execution fails,-1 is returned. // int GetAllInstalledAppInfoA (vector <ApplicationInfoA> & vAppInfo) {int ret; // open the registry key- Export HKEY hKey; LPCSTR lpszSubKey = "SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall"; ret = RegOpenKeyExA (HKEY_LOCAL_MACHINE, lpszSubKey, 0, KEY_ALL_ACCESS, & hKey ); if (ret! = ERROR_SUCCESS) {return-1 ;}// obtain the subkey & key value information mongodword dwSubKeysCnt; // Number of subkeys DWORD dwMaxSubKeyNameLen; // the maximum length (not including the terminating null character) of the subkey name DWORD dwKeyValueCnt; // the number of key values DWORD dwMaxKeyValueNameLen; // the maximum length of the key value name (not including the terminating null character) DWORD dwMaxKeyValueDataLen; // the maximum length of the key value data (in Bytes) ret = RegQueryInfoKe Y (hKey, NULL, & dwSubKeysCnt, & dwMaxSubKeyNameLen, NULL, & dwKeyValueCnt, & dwMaxKeyValueNameLen, & dwMaxKeyValueDataLen, NULL, NULL); if (ret! = ERROR_SUCCESS) {RegCloseKey (hKey); return-1 ;}// list the sub-key information. Repeated DWORD dwIndex; LPSTR lpszSubKeyName = new char [dwMaxSubKeyNameLen + 1]; DWORD dwNameLen = forward + 1; for (dwIndex = 0; dwIndex <dwSubKeysCnt; ++ dwIndex) {dwNameLen = dwMaxSubKeyNameLen + 1; memset (lpszSubKeyName, 0, forward + 1 ); ret = RegEnumKeyEx (hKey, DwIndex, lpszSubKeyName, & dwNameLen, NULL); if (ret! = ERROR_SUCCESS) {RegCloseKey (hKey); delete [] lpszSubKeyName; return-1 ;} // ************* obtain the installation information of the specific program BEG **************** ApplicationInfoA appInfo; appInfo. strName = lpszSubKeyName; _ GetAppInfoA _ (hKey, lpszSubKeyName, "DisplayName", appInfo. strDisplayName); _ GetAppInfoA _ (hKey, lpszSubKeyName, "Publisher", appInfo. strPublisher); _ GetAppInfoA _ (hKey, lpszSubKeyName, "Version", appInfo. strVersion); _ GetAp PInfoA _ (hKey, lpszSubKeyName, "DisplayVersion", appInfo. strDisplayVersion); _ GetAppInfoA _ (hKey, lpszSubKeyName, "InstallLocation", appInfo. strInstallLocation); vAppInfo. push_back (appInfo ); // ************ obtain the installation information of a specific program END ***************} delete [] lpszSubKeyName; // close the registry key ---------------------------------------------------------- RegCloseKey (hKey); return 0;} int main () {cout <"Reg Demo Test" <Endl; vector <ApplicationInfoA> vAppInfo; cout <GetAllInstalledAppInfoA (vAppInfo) <endl; // output to the file vector <ApplicationInfoA >:: iterator iter = vAppInfo. begin (); FILE * fp = fopen ("D: \ InstalledAppInfo.txt", "a"); while (iter! = VAppInfo. end () {fprintf (fp, "---------------- \ n"); fprintf (fp, "Name: % s \ n DisplayName: % s \ n Publisher: % s \ n Version: % s \ n DisplayVersion: % s \ n InstallLocation: % s \ n ", iter-> strName. c_str (), iter-> strDisplayName. c_str (), iter-> strPublisher. c_str (), iter-> strVersion. c_str (), iter-> strDisplayVersion. c_str (), iter-> strInstallLocation. c_str (); fprintf (fp, "---------------- \ n"); + + iter;} fclose (fp); return 0 ;}