File I/O using COCOS2D-X
Solution 1
I got working by using CCFileUtils( )::sharedFileUtils( ) -> fullPathFromRelativePath( "POSDATA.GAMEDATA" );
A more detailed explanation:
- Add the files that you need in the Project by going to the Project Tree on the left and
Right-click -> Add Files
. What I did was I added a new folder calledData
on the same level as theResources
andClasses
folders and placed myPOSDATA.GAMEDATA
file there. In Xcode, I added a new group and added that file in that group. - Then I used
ifstream
to open the file. - When opening the file, use
CCFileUtils( )::sharedFileUtils( ) -> fullPathFromRelativePath( )
to get the absolute path of the file. Supply the file name on thefullPathFromRelativePath( )
as argument. - Try to run it and it should work fine.
A small example:
// FileReader.h
#include "cocos2d.h"
using namespace std;
using namespace cocos2d;
class FileReader {
private:
vector< string > mFileContents;
public:
FileReader( string pFileName, char pMode = 'r' );
};
// FileReader.cpp
#include "FileReader.h"
#include <fstream>
#include "cocos2d.h"
using namespace cocos2d;
using namespace std;
FileReader::FileReader( string pFileName, char pMode ) {
// Create input file stream
ifstream inputStream;
string thisLine;
// Open file
inputStream.open( CCFileUtils( )::sharedFileUtils( ) -> fullPathFromRelativePath( pFileName ).c_str( ) );
// Check if it is open
if ( !inputStream.is_open( ) ) {
cerr << "[ ERROR ] Cannot open file: " << pFileName.c_str( ) << endl;
exit( 1 );
}
while ( getline( inputStream, thisLine ) ) {
// Put all lines in vector
mFileContents.push_back( thisLine );
}
inputStream.close( );
cout << "[ NOTICE ] Finished opening file: " << pFileName.c_str( ) << endl;
}
This class will load a file with the name pFileName
and place it on its member variable mFileContents
. ( Note that it should have a public get
function like vector< string > getFileContents( )
to access the mFileContents
because it is private
)
EDIT: The above sample will work on iOS, however, it won't on Android devices. So to fix this, instead of using ifstream
, use CCFileUtils::sharedUtils( ) -> getFileData( )
instead. In conjunction with CCFileUtils::sharedUtils( ) -> fullPathFromRelativePath( )
, we will be able to achieve our goal of reading a plain text file that works on both iOS and Android.
The FileReader
class would then be like this:
// FileReader.cpp
#include "FileReader.h"
#include <fstream>
#include "cocos2d.h"
using namespace cocos2d;
using namespace std;
FileReader::FileReader( string pFileName, char pMode ) {
// Initialize variables needed
unsigned long fileSize = 0;
unsigned char * fileContents = NULL;
string thisLine, result, fullPath, contents;
// Get absolute path of file
fullPath = CCFileUtils::sharedFileUtils( ) -> fullPathFromRelativePath( pFileName.c_str( ) );
// Get data of file
fileContents = CCFileUtils::sharedFileUtils( ) -> getFileData( fullPath.c_str( ) , "r", &fileSize );
contents.append( ( char * ) fileContents );
// Create a string stream so that we can use getline( ) on it
istringstream fileStringStream( contents );
// Get file contents line by line
while ( getline( fileStringStream, thisLine ) ) {
// Put all lines in vector
mFileContents.push_back( thisLine );
}
// After this, mFileContents will have an extra entry and will have the value '\x04'.
// We should remove this by popping it out the vector.
mFileContents.pop_back( );
// Delete buffer created by fileContents. This part is required.
if ( fileContents ) {
delete[ ] fileContents;
fileContents = NULL;
}
// For testing purposes
cout << "[ NOTICE ] Finished opening file: " << pFileName.c_str( ) << endl;
}
Solution 2
// For versions less than v2.0.1
// The version I am using is 0.12.0
unsigned long fileSize = 0;
char* pBuffer = CCFileUltils::getFileData("relative_path","r",&fileSize);
CCLOG("Data is %s",pBuffer);
Comments
-
alxcyl over 1 year
I'm trying to load up a Comma Separated file called
POSDATA.GAMEDATA
. I've looked up several places on the internet and it turns out I need to do some tweaking and / or a different class.I tried using
ifstream
. However, it cannot open the file. Xcode 4.3.2 cannot seem to find myPOSDATA.GAMEDATA
file. I also tried to make the file usingofstream
but when I useopen()
in both cases, the file is not opened.My code is something like this:
using namespace std; void FileLoader::loadFile( string p_WhichFile ) { // Local Variables string thisLine; // Open POSDATA.GAMEDATA ifstream dataStream; dataStream.open( p_WhichFile.c_str( ) ); // Check if file is opened if ( !dataStream ) { cerr << "[ ERROR ] Cannot load file:" << p_WhichFile.c_str( ) << endl; exit( 1 ); } // Get lines of strings while ( getline( dataStream, thisLine ) ) { fileContents.push_back( thisLine ); // fileContents is a vector< string > object } dataStream.close( ); cout << "[ NOTICE ] Finished reading file" << p_WhichFile << endl; }
I've seen
CCFileUtils
but I can't seem to get how to use it.EDIT: I've tried supplying the absolute path (
/Users/LanceGray/Documents/LanceDev/COCOS2DX/cocos2dx/TestGame/Data/POSDATA.GAMEDATA
) and it worked. However, I cannot do this since the game is supposed to be used in iOS devices and Android, so the path is not always the same on each device. Any help will be grealy appreciated. -
alxcyl over 11 yearsThanks for the help. I've got it working by using
CCFileUtils
, though. -
alxcyl over 11 yearsI tried using
getFileData()
but I get an error sayingAssertion failed: (pszFileName != __null && pSize != __null && pszMode != __null), function getFileData, file CCFileUtils.mm, line 450.
I used it like this:unsigned char * posdataLoc = CCFileUtils::sharedFileUtils() -> getFileData( "POSDATA.GAMEDATA", "r", 0 );
-
alxcyl over 11 yearsI got
getFileData( )
working now. When Icout
it on the console, it shows extra random characters on the end. Weird. -
nikhil almost 9 yearsDon't copy and paste the same link in multiple questions. This is not an answer but a comment at best.
-
Cristi almost 6 yearsWhat if you have a huge data file on android and can't afford to read the entire file with getFileData()? It would be nice to have more direct access... like fseek