serialize a struct

[markww]

Hi,

I have a structure like this:

struct TEST {
int x, y, z;
string str;
vector<float> vFloat;
};

I need to serialize an instance of this struct into a stream of bytes
(its for insertion into a 3rd party file). This 3rd party library has a
function to insert the serialized buffer into their files that looks
like:

SetPrivateData(unsigned char *pData, int nSize);

It was suggested I do the following:

TEST t;

// how much space do we need?
int bufsize = sizeof(int)* 3 + sizeof(float)*t.vFloat.size() +
t.str.length()+1;

// create and clear the buffer
unsigned char *buf = new unsigned char[bufsize];
memset(buf, 0, bufsize);

unsigned char *pBuf = buf;

int *pIntBuf = (int *) buf;

// copy in the ints
*pIntBuf = t.x;
pIntBuf++;
*pIntBuf = t.y;
pIntBuf++;
*pIntBuf = t.z;
*pIntBuf++;

// copy in the floats
pBuf = (unsigned char *)pIntBuf;
vector<float>:ointer floatptr = &(t.vFloat[0]);

memcpy(pBuf, floatptr, t.vFloat.size()*sizeof(float);
pBuf += t.vFloat.size()*sizeof(float);

// copy in the string
strcpy(pBuf, t.str.c_str());

But I'm not sure if this is working correctly, the above executes but
dies when I try printing any portion of it to screen to examine the
contents using printf(). Is the above doing what I need it to do?

Thanks,
Mark

 

[Barry Schwarz]

Hi,

I have a structure like this:

struct TEST {
int x, y, z;
string str;
vector<float> vFloat;
};

Try comp.lang.c++


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