Suspend Windows 10 Store App on launch

问题:

I am writing a tool in C++ to help debug and test deployed Windows 10 Store Apps. One of the problems I've run into is that I need a way to launch a Store App in a suspended state so I can attach a debugger before the app initializes. The usual way I know of to do something like this would be to set a hook on process creation in the parent process and forcibly flag the created process to start in a suspended state; however, for Store Apps, the parent process that creates the actual app process is svchost.exe which runs at a system level and can't be hooked without a kernel-mode driver of some sort.

I am using the IApplicationActivationManager interface to launch applications, and am using the IPackageDebugSettings interface to control/debug them after launch. Is there a way I can suspend a Windows 10 Store App when it launches so that it isn't allowed to first initialize?

回答1:

Looking back, I nearly answered my own question within the question itself. To launch a Windows 10 Store app in a suspended state, use the IPackageDebugSettings::EnableDebugging method to set an executable as a debugger. The app being debugged will launch suspended automatically; it's then the debugger's responsibility to resume the app.

What I ended up doing in my project is something akin to this:

// Gets the current application's UserModelId and PackageId from the registry
std::wstring appName = AppUtils::GetApplicationUserModelId();
std::wstring appFullName = AppUtils::GetApplicationPackageId();

HRESULT hResult = S_OK;

// Create a new instance of IPackageDebugSettings
ATL::CComQIPtr<IPackageDebugSettings> debugSettings;
hResult = debugSettings.CoCreateInstance(CLSID_PackageDebugSettings, NULL, CLSCTX_ALL);
if(hResult != S_OK) return hResult;

// Enable debugging and use a custom debugger
hResult = debugSettings->EnableDebugging(appFullName.c_str(), pathToDebugger.c_str(), NULL);
if(hResult != S_OK) return hResult;

// Launch the application
DWORD dwProcessId = 0;
hResult = AppUtils::LaunchApplication(appName, &dwProcessId);
if(hResult != S_OK) return hResult;

/* Do more stuff after the app has been resumed by the debugger */

// Stop debugging the application so it can run as normal
hResult = debugSettings->DisableDebugging(appFullName.c_str());
if(hResult != S_OK) return hResult;

I wrote a basic wrapper for IPackageDebugSettings as well as a few utility functions for dealing with Windows 10 Store apps to make the overall process easier.

回答2:

In Visual Studio go to the properties of your project. Then go into the Debug tab and select 'Do not launch, but debug my code when it starts'.

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