Re: Binary file IO: Converting imported sequences of chars to desired
type
* Rune Allnor:
On 17 Okt, 19:47, Maxim Yegorushkin <maxim.yegorush...@gmail.com>
wrote:
On 17/10/09 18:39, Rune Allnor wrote:
Hi all.
I have used the method from this page,
http://www.cplusplus.com/reference/iostream/istream/read/
to read some binary data from a file to a char[] buffer.
The 4 first characters constitute the binary encoding of
a float type number. What is the better way to transfer
the chars to a float variable?
The naive C way would be to use memcopy. Is there a
better C++ way?
This is the correct way since memcpy() allows you to copy unaligned data
into an aligned object.
Another way is to read data directly into the aligned object:
float f;
stream.read(reinterpret_cast<char*>(&f), sizeof f);
The naive
std::vector<float> v;
for (n=0;n<N;++n)
{
file.read(reinterpret_cast<char*>(&f), sizeof f);
v.push_back(v);
}
doesn't work as expected. Do I need to call 'seekg'
inbetween?
post complete code
cheers & hth
- alf
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