C++ 获取已安装程序笔记

在Windows系统中，已安装软件的信息都保存在注册表中

那种绿色免安装包还不知道怎么获取

32位系统存在以下两个位置：

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

64位系统在32位系统上多出一处，也就是WOW6432Node的节点下

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall

如何区分哪个是补丁哪个是安装程序

1.如果注册表项下面有"SystemComponent"字段并且值等于1时，表示这是个系统组件，而不是应用软件。
2.如果注册表项下面有"ParentKeyName"字段则表示该项是某个分类下的子项，一般情况补丁才会有"ParentKeyName"字段。
比如这个"Update for  (KB2504637)"

具体实现代码

• 拿64位系统举例

  要做的就是分别循环3个注册列表里面的值

HKEY hKey;
HRESULT hr = ::RegOpenKeyEx(HKEY_LOCAL_MACHINE, UNINSTALL_SOFT32, 0, KEY_READ | KEY_WOW64_64KEY, &hKey);
HRESULT hr2 = ::RegOpenKeyEx(HKEY_CURRENT_USER, UNINSTALL_SOFT32, 0, KEY_READ | KEY_WOW64_64KEY, &hKey);
HRESULT hr3 = ::RegOpenKeyEx(HKEY_LOCAL_MACHINE, UNINSTALL_SOFT64, 0, KEY_READ | KEY_WOW64_64KEY, &hKey);
RegistryHandler(hKey, installers);

• 定义一个核心处理函数

  void installser::CInstallerHandler::RegistryHandler(HKEY &hKey, std::vector<tagInstaller> & installers)//函数处理终端
  {
  	unsigned long index;
  	TCHAR buffer[MAX_PATH];
  	for (index = 0;; index++)
  	{
  		memset(buffer, 0, sizeof(buffer));
  		DWORD len = sizeof(buffer);
  		HRESULT hr = RegEnumKeyEx(hKey, index, buffer, &len, 0, NULL, NULL, NULL);//枚举指定的打开注册表项的子项
  		if (hr == ERROR_SUCCESS){
  			tagInstaller itl;
  			if (DumpSoftware(itl, buffer, hKey)){
  				if (itl.name != ""){
  					installers.push_back(itl);
  				}
  			}
  
  		}
  		else if (hr == ERROR_NO_MORE_ITEMS){
  			RegCloseKey(hKey);
  			break;
  		}
  		else{
  			RegCloseKey(hKey);
  			break;
  		}
  
  	}
  }

• 核心代码打开注册表循环提取里面的值

bool CInstallerHandler::DumpSoftware(tagInstaller & itl, LPCTSTR szKey, HKEY hParent)//注册列表相应信息查询函数
{
	LRESULT lr;
	HKEY hKey;
	LONG size;
	TCHAR buffer[MAX_PATH];
	lr = RegOpenKey(hParent, szKey, &hKey);//hParent表示注册列表的健值，szKey要打开的注册表项的名称，hKey打开注册列表后返回指定表的指针

	//不能打开注册表
	if (lr != ERROR_SUCCESS)
	{
		logger::record() << "Cannot open key";
		return false;
	}


	size = sizeof(buffer);
	lr = GetValue(hKey, _T("DisplayName"), &buffer[0], &size);
	if (lr == ERROR_SUCCESS)
	{
		if (size > 0)
		{
			itl.name = buffer;
		}


	}
	else
	{
		size = sizeof(buffer);
		lr = GetValue(hKey, _T("QuietDisplayName"), &buffer[0], &size);
		if (ERROR_SUCCESS == lr && size > 0)
		{
			itl.name = buffer;
		}
		/*else
			return false;*/
	}

	if (itl.name.empty())
	{
		RegCloseKey(hKey);
		return false;
	}

	size = sizeof(buffer);
	lr = GetValue(hKey, _T("SystemComponent"), &buffer[0], &size);//判断是否是其他程序安装的
	if (lr == ERROR_SUCCESS)
	{
		if (buffer>0){
			return false;
		}
			

	}
	size = sizeof(buffer);
	lr = GetValue(hKey, _T("ParentKeyName"), &buffer[0], &size);//判断是否是补丁
	if (lr == ERROR_SUCCESS)
	{
		if (buffer>0){
			return false;
		}


	}


	size = sizeof(buffer);
	lr = GetValue(hKey, _T("InstallLocation"), &buffer[0], &size);
	if (ERROR_SUCCESS == lr && size > 0)
	{
		itl.install_path = buffer;
		itl.install_path = CStringUtil::StringToUTF8(itl.install_path);
		//logger::record() << itl.install_path;
	}
	else//如果找不到安装路径就找lcon图标路径
	{
		lr = GetValue(hKey, _T("DisplayIcon"), &buffer[0], &size);
		if (ERROR_SUCCESS == lr && size > 0)
		{
			
			itl.install_path = buffer;
			itl.install_path=StringProcess(itl.install_path);
			itl.install_path = CStringUtil::StringToUTF8(itl.install_path);
		}
		else//如果还是找不到就找卸载路径
		{
			lr = GetValue(hKey, _T("UninstallString"), &buffer[0], &size);
			if (ERROR_SUCCESS == lr && size > 0)
			{
				itl.install_path = buffer;
				itl.install_path = StringProcess(itl.install_path);
				itl.install_path = CStringUtil::StringToUTF8(itl.install_path);
			}
		}
	}


	DWORD dwValue, dwType;
	DWORD dwBufLen = 255;
	std::string install_data;
	if (RegQueryValueEx(hKey, _T("InstallDate"), NULL, &dwType, (LPBYTE)&buffer, &dwBufLen) == ERROR_SUCCESS)
	{
		if (dwType == 4){
			DWORD dwSize = 0;
			lr = GetDword(hKey, _T("InstallDate"), dwSize);
			if (ERROR_SUCCESS == lr){
						time_t t = dwSize;
						auto p = gmtime(&t);
						char s[80];
						strftime(s, 80, "%Y-%m-%d %H:%M:%S", p);
						itl.install_data = s;
			}
		}
		else{
			size = sizeof(buffer);
			lr = GetValue(hKey, _T("InstallDate"), &buffer[0], &size);


			if (ERROR_SUCCESS == lr && size > 0)
			{
				itl.install_data = buffer;

				if (itl.install_data.length() == 8){
					std::string temp = itl.install_data.substr(0, 4);
					temp.append("-");
					temp.append(itl.install_data.substr(4, 2));
					temp.append("-");
					temp.append(itl.install_data.substr(6, 2));
					temp.append(" 00:00:00");
					itl.install_data = temp;
				}
				else{
					itl.install_data = "";
				}
			}
			else
				itl.install_data = "";
		}	
	}

	


	DWORD dwSize = 0;
	lr = GetDword(hKey, _T("EstimatedSize"), dwSize);
	if (ERROR_SUCCESS == lr && size > 0)
	{
		auto temp = dwSize / 1024;
		char buf[64] = {0};
		
		_itoa_s(temp, buf, sizeof(buf), 10);
		itl.package_size = buf;
	}

	size = sizeof(buffer);
	lr = GetValue(hKey, _T("DisplayVersion"), &buffer[0], &size);
	if (ERROR_SUCCESS == lr && size > 0)
	{
		itl.version = buffer;
	}

	size = sizeof(buffer);
	lr = GetValue(hKey, _T("Publisher"), &buffer[0], &size);
	if (ERROR_SUCCESS == lr && size > 0)
	{

		itl.publisher = buffer;
		itl.publisher = CStringUtil::StringToUTF8(itl.publisher);
	}

	itl.name = CStringUtil::StringToUTF8(itl.name);

	RegCloseKey(hKey);

	return true;

}