A way to read Leadwerks data files?

[reepblue]

I've noticed that by default the engine creates a settings file and saves it to the AppPath. The issue is that there is really no clear documentation about how to read or write keyvalues in a stream. So I just used PugiXML for settings instead.

 

Now I'm faced with this issue again. I want to get a custom value in a material file, but I want to check if it's there. and read the value after the equal symbol. I've spent the last few hours looking at the FileSystem/Stream classes. I'd hope there was a ReadKey() function. The only thing I saw that looked like what I was looking for is:

 

Stream* ReadFile(const std::string& path, uint64_t fileid, const std::string key);

 

But I have no idea how I'd set up the fileid. Any tips would be appreciated. Thanks.

[nick.ace]

Where do you see this command? There is a Readfile command, but it only has a path for an argument. Maybe I'm interpreting the question wrong.

[reepblue]

Where do you see this command? There is a Readfile command, but it only has a path for an argument. Maybe I'm interpreting the question wrong.

 

FileSystem.h of the engine's API.

[gamecreator]

You might be looking for a command like ReadLine from the Stream commands. It includes and example but I'm happy to help if you want me to write a quick example for you. After that it's just about using a string command to read a portion of the string (after the equal sign).

 

What's the settings file name, by the way? I don't see it in my project.

[reepblue]

My main problem would be the Seek command. How would it know where to find it? The keyvalue can be at the top or at the bottom of the file.

[gamecreator]

You read line by line and check each string to see if it matches the key you're looking for with something like compare

http://www.cplusplus.com/reference/string/string/compare/

[reepblue]

I did it like this, I'll look into compare right now, thanks.

 

std::string GetKeyValue(std::string pPath, std::string pKeyVal)

{

std::string path = pPath;

Stream* stream = FileSystem::ReadFile(path);

string command(pKeyVal + "=");

std::size_t found = stream->ReadString().find(command);

 

if (found != std::string::npos)

std::cout << pKeyVal << " found at: " << found << '\n';

 

stream->Seek(found + command.size());

string finals = stream->ReadString();

finals.erase(

remove(finals.begin(), finals.end(), '\"'),

finals.end()

);

 

return finals;

 

EDIT: still has a problem if the value isn't the last.

[nick.ace]

Could it be the second ReadString command (perhaps replace it with ReadLine)? I don't know what the remove function does.

[reepblue]

Yeah, I was missing ReadLine, I got involved looking into raw C++ stuff meanwhile that function is what I needed. ><

 

All working now, thanks. Does not support everything, but it will support most things.

 

std::string GetKeyValue(std::string pPath, std::string pKey)

{

Stream* stream = FileSystem::ReadFile(pPath);

string command(pKey + "=");

 

std::size_t found = stream->ReadString().rfind(command);

if (found != std::string::npos)

{

std::cout << pKey << " found at: " << found << '\n';

}

 

stream->Seek(found + command.size());

 

// Read only the line we're on!

string finals = stream->ReadLine();

 

// Delete the quotes if any.

finals.erase(

remove(finals.begin(), finals.end(), '\"'),

finals.end()

);

 

// Return our value!

return finals;

}

 

// This function will be called once when the program starts.

bool Start()

{

std::string path = "materials/developer/bluegrid.mat";

cout << GetKeyValue(path, "shader") << endl;

}