Archived

This topic is now archived and is closed to further replies.

BigReaper

Binary File Output?

Recommended Posts

BigReaper    122
hello there, can anybody help me with writing some data into a binary file? here is the code i use:
        ofstream File;
	int StartPos[3];
	x=20,y=15;

	File.open("map.dat",ios::out | ios::binary);

	File.seekp(0);
	File.write((char*)StartPos, sizeof(StartPos));
	StartPos[0]=File.tellp();
	File.write((char*)x, sizeof(x));
	StartPos[1]=File.tellp();
	File.write((char*)y, sizeof(y));
	StartPos[2]=File.tellp();
	File.write((char*)map, sizeof(map));
	File.seekp(0);
	File.write((char*)StartPos, sizeof(StartPos));
	File.close();
 
without the x and y datas it works, but with them, there is an error in the function ''streambuf::xsputn''. Hope you can help me.

Share this post


Link to post
Share on other sites
Mezz    571
While I''m not familiar with the C++ File IO methods, I suspect your problem is that it expects a pointer, you can''t cast a non-pointer into a pointer like you have:

(char *)x

you would have to go:

(char *)&x

but in those function calls, you could probably get away with:

&x

as the parameter.

-Mezz

Share this post


Link to post
Share on other sites
BigReaper    122
Ok I think that works, there is no error. but when i try to read the file, it reads the wrong data ...
do you know another method to write and read binary data?

Share this post


Link to post
Share on other sites