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writing binary file (C++)


 
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# 8  
Old 06-10-2011
Thanks! Well it seems it actually works

writing 5 random numbers

00000000 4d 50 2d 50 45 52 2d 42 20 0a 05 00 00 00 02 00 |MP-PER-B .......|
00000010 00 00 01 00 00 00 02 00 00 00 04 00 00 00 01 00 |................|
*
00000020

this is the output of the binary file
# 9  
Old 06-10-2011
Quote:
Originally Posted by lamachejo
Thanks! Well it seems it actually works

writing 5 random numbers

00000000 4d 50 2d 50 45 52 2d 42 20 0a 05 00 00 00 02 00 |MP-PER-B .......|
00000010 00 00 01 00 00 00 02 00 00 00 04 00 00 00 01 00 |................|
*
00000020

this is the output of the binary file
Makes sense, yeah. It looks like hexdump squeezed some zeroes together though, where it put the *, got to watch for that.

You can write entire structures and such to file by the way, you don't have to deal with individual atomic types.

Code:
int arr[512];

struct
{
        int a;
        float b;
        char c[32];
} stuff={1, 3.14159, "stuff"};

fwrite(arr, 512, sizeof(int), fileptr);
fwrite(&stuff, 1, sizeof(stuff), fileptr);

You can't write entire classes, though. Or any structures containing pointers. Both may contain information that may not make sense when reloaded.
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