VC 获取Windows已安装软件（注册表方式）

Windows把卸载信息保存在注册表键HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Uninstall之下。我们可以枚举这个键的子键来了解哪个软件已经安装且可以卸载。在这个键的下面，每个子键代表一个可卸载项，每个子键下都列出一系列和相关软件有关的信息，重要的是以下信息：

DisplayName：显示名称，这是我们看到的该软件的名字，例如：Adobe Acrobat 5.0

DisplayVersion：显示版本，软件的版本号

InstallLocation：软件安装目录

InstallSource：该软件从哪个位置安装（例如网络共享或者安装光盘)

Publisher：发布该软件的厂商

UninstallPath：卸载该软件的路径

UninstallString：卸载该软件的命令行

URLinfoabout：介绍该软件的网页

UrlUpdateInfo：网络更新该软件的位置

示例代码如下：

#include "stdafx.h"#include <iostream>#include <windows.h>#include <tchar.h>using namespace std;//LRESULT GetValue(HKEY hKey, LPCTSTR name, LPTSTR value, LPLONG size){return ::RegQueryValueEx(hKey, name, NULL, NULL, (LPBYTE)value, (LPDWORD)size);}//void DumpSoftware(LPCTSTR szKey , HKEY hParent){LRESULT lr;HKEY hKey;LONG size;TCHAR buffer[MAX_PATH];lr = RegOpenKey(hParent, szKey, &hKey);//不能打开注册表if(lr != ERROR_SUCCESS){wcout << _T("Cannot open key ") << szKey << _T("(") << lr << _T(")") << endl;return;} size = sizeof(buffer);lr = GetValue(hKey, _T("DisplayName"), &buffer[0], &size);if(lr == ERROR_SUCCESS){if(size > 0){wcout << _T("Display Name: " ) << buffer << endl;}}else{size = sizeof(buffer);lr = GetValue(hKey, _T("QuietDisplayName"), &buffer[0], &size);if(ERROR_SUCCESS== lr && size > 0 ){wcout << _T("Display Name: " ) << buffer << endl;}}size = sizeof(buffer);lr = GetValue(hKey, _T("InstallLocation"), &buffer[0], &size);if(ERROR_SUCCESS == lr && size > 0){wcout << _T("Installation Location: ") << buffer << endl;}size = sizeof(buffer);lr = GetValue(hKey, _T("InstallSource"), &buffer[0], &size);if(ERROR_SUCCESS == lr && size > 0){wcout << _T("Installation Source: ") << buffer << endl;}size = sizeof(buffer);lr = GetValue(hKey, _T("UninstallPath"), &buffer[0], &size);if(ERROR_SUCCESS == lr && size > 0){wcout << _T("Uninstall Path: ") << buffer << endl;}size = sizeof(buffer);lr = GetValue(hKey, _T("UninstallString"), &buffer[0], &size);if(ERROR_SUCCESS == lr && size > 0){wcout << _T("Uninstall String: ") << buffer << endl;}RegCloseKey(hKey);}#define UNINSTALL_SOFT _T("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall")//int main(int argc, char* argv[]){std::wcout.imbue(std::locale("chs"));unsigned long index;TCHAR buffer[MAX_PATH];HKEY hKey;HRESULT hr = ::RegOpenKeyEx(HKEY_LOCAL_MACHINE, UNINSTALL_SOFT, 0, /*KEY_ALL_ACCESS*/KEY_READ, &hKey);if(hr != ERROR_SUCCESS){wcout << _T("Cannot open the key :") << hr << endl;return -1;}for(index =0; ;index++){hr = RegEnumKey(hKey, index, &buffer[0], sizeof(buffer));switch(hr){case ERROR_SUCCESS:DumpSoftware(buffer, hKey);break;case ERROR_NO_MORE_ITEMS:wcout << _T("Finish enumerate softwares\r\n") << endl;RegCloseKey(hKey);return 0;default:wcout << _T("Cannot enumerate software\r\n") << hr << endl;RegCloseKey(hKey);return -2;}}wcout<<_T("Finish enumerate softwares\r\n") << endl;RegCloseKey(hKey);system("pause");return 0;}