GetMesh() with pointer instead of strings

[Lunacore]

GetMesh() everytime uses simple paths to load meshs from the harddrive.

Code: Select all

IAnimatedMesh* Player = smgr->getMesh("./models/test.x");

I encoded my meshs and other files and saved it to my harddrive. In my game I decode them and save them in temporary files. Now the temporary files contain my original meshs, and doesn't save it to my harddrive, so it's hard to get them. Only the pointer shows to them. But how could I load my decoded meshs from my RAM with GetMesh() and these pointers?

Code: Select all

FILE* FileDecode(char Input[])
{
    FILE* tempData = tmpfile();
    ...
    return tempData;
}

int main()
{
    ...
    IAnimatedMesh* Player = smgr->getMesh(FileDecode("./models/test.x.encoded"));
    ...
}

[bitplane]

Use the smgr->getMesh (io::IReadFile*) method. You can create the IReadFile from a memory address using io::createMemoryReadFile

[Lunacore]

Okay, I have searched for createMemoryReadFile and it really seems to be a solution. But why do I need "const path & fileName"?

[Acki]

to identify the created mesh, it's like the name of the mesh...
it must not be a path, just a unique name to identify the mesh...

[Lunacore]

By using createMemoryReadFile I get another problem with this example code:

Code: Select all

    FILE* test = fopen("./Models/Figur.ms3d","rb"); //first file on harddrive
    FILE* test2 = tmpfile(); //second file on memory
    //get filesize 
      fseek(test, 0, SEEK_END); int FileSize=ftell(test); fseek(test, 0, SEEK_SET);
    //copy first file into second file
      for(int i=0;i<FileSize;i++) fputc(fgetc(test),test2);
      fclose(test); //close first file
    
    //load second file from memory
      IReadFile* tmpModel = device->getFileSystem()->createMemoryReadFile(test2,FileSize,L"test.ms3d", false);
      IAnimatedMesh* MeshModel = smgr->getMesh(tmpModel); //here the application crashed
      IAnimatedMeshSceneNode* Mesh = smgr->addAnimatedMeshSceneNode(MeshModel); //he doesn't reach this point

The application crashed in function getMesh. How can this happened?

[sudi]

Actually this sounds more like you want to use a fileArchive. check the archive interface if that would make your life simpler.

[Lunacore]

No, i don't want to use a FileArchive like *.zip or others. Just the single files. The code was only an example and has nothing to do with my intention.
I only try to load a file into the memory and use it from there and not from my harddrive. The code shown above should realize this, but it doesn't seem to work and I can't see, why...

[Radikalizm]

Try using the interface irrlicht provides for loading files instead of using the standard C stream functions

[sudi]

No, i don't want to use a FileArchive like *.zip or others. Just the single files. The code was only an example and has nothing to do with my intention.
I only try to load a file into the memory and use it from there and not from my harddrive. The code shown above should realize this, but it doesn't seem to work and I can't see, why...

Well you are probably loading the file from the harddrive at somepoint or from a server doesn't matter.
The IArchive interface can make it seamless for you so that you don't have to do this tricky stuff when calling get mesh.

[Sylence]

Code: Select all

    FILE* test2 = tmpfile(); //second file on memory
...

    //load second file from memory
      IReadFile* tmpModel = device->getFileSystem()->createMemoryReadFile(test2,FileSize,L"test.ms3d", false);

How do you expect this to work?
createMemoryReadFile() wants the data, not a pointer to a file...

[Lunacore]

But the documentation of createMemoryReadFile shows

virtual IReadFile* irr::io::IFileSystem::createMemoryReadFile ( void * memory,
s32 len,
const path & fileName,
bool deleteMemoryWhenDropped = false
)
memory,: A pointer to the start of the file in memory

So I use the pointer of the temporary file from the memory. Is this wrong?

[sudi]

yeah that is wrong. FILE is a pointer to the files io. its not the file in memory its just an interface to the file. you have to load the file completly into memory to use that function.