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;
}