Problem with casting back an array object?

Question

Hi,

I want writing some localsettings with an Platform::Array<String^>^ Like:

Platform::Array<String^>^ settings = ref new Platform::Array<String^>(3);
settings[0] = "123";
settings[1] = "1234";
settings[2] = "12345";
ApplicationDataContainer^ localSettings = ApplicationData::Current->LocalSettings;
auto values = localSettings->Values;
values->Insert("Settings", settings);

And then i read the localSettings and cast it back to Platform::Array<String^>^ Like:

ApplicationDataContainer^ localSettings = ApplicationData::Current->LocalSettings;
auto values = localSettings->Values;

Platform::Array<String^>^ settings = safe_cast<Platform::Array<String^>^>(localSettings->Values->Lookup("Settings"));

There occours an violation reading exception in the "vccorlib.h" 's inline function 

template <typename __TArg>
inline __TArg* WriteOnlyArray<__TArg, 1>::AllocateAndCopyElements(const __TArg* __srcArg, unsigned int __countArg)
{
__TArg* __dest = AllocateAndZeroInitialize(__countArg);
for (unsigned int __i = 0; __i < __countArg; ++__i)
{
__dest[__i] = __srcArg[__i];
}
return __dest;
}

the __countArg perimeters passed with some garbage data

Any ideas of what's wrong with my code?

Thanks

Answer 1

Hi,

As far as I know, the ApplicationDataContainer.Values is a map.
http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.applicationdatacontainer.values.aspx
In C++/CX, we cannot inset a arrary to a map directly. The complier will throw error with these codes.

	Platform::Collections::Map<String^,Platform::Array<String^>^>^ map =ref new Platform::Collections::Map<String^,Platform::Array<String^>^> ();

	map->Insert("first",settings);

	auto arrayvalues=map->Lookup("first");

Best regards,
Jesse

---

Jesse Jiang
MSDN Community Support | Feedback to us
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Answer 2

Hi,

I marked my reply as answer, if your issue has not been solved please unmark it and update more information about this issue.

Best regards,
Jesse

---

Jesse Jiang
MSDN Community Support | Feedback to us
Develop and promote your apps in Windows Store
Please remember to mark the replies as answers if they help and unmark them if they provide no help.