CODEWITHSUNDEEP
androidandroid-ndk
xiaoy
xiaoy

Reputation: 41

Why android ndk function AAsetManager_open error, when the path is like this

string relativePath = "scripts/test.pb"; // this is ok
string relativePath = "./scripts/test.pb"; // this can not open the file"
AAsset* asset = AAssetManager_open(FileUtilsAndroid::assetmanager,
                           relativePath.c_str(),
                           AASSET_MODE_UNKNOWN);

When i use this function to open android apk file, the "relativePath" contains "." can not work. i can not understand why? and i can not see the source code of "AAssetManager_open", so just need help.

Upvotes: 1

Views: 767

Answers (1)

Alex Bitek
Alex Bitek

Reputation: 6557

If you look at the source code for AAssetManager_open , you will see that it calls AssetManager::open , which does this:

String8 assetName(kAssetsRoot);
assetName.appendPath(fileName);

where kAssetsRoot is a static const char* defined to hold the value "assets"

If you use "./scripts/test.pb" as the filename this will yield "assets/./scripts/test.pb" (which is a valid unix pathname, i.e. you can add as many "./" or "/" and it should still be a valid path), but inside AssetManager::openNonAssetInPathLocked it appends "assets/./scripts/test.pb" to ap.path which maybe causes problems further down the callstack i.e. in Asset::createFromFile which calls open and _FileAsset::openChunk on the given filepath.

Upvotes: 1

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