C / C++ / MFC

struct Point
{
    double x, y;
};

struct Polyline
{
    __int32 pointCount;
    Point points[2]; // two or more
};

Stefan63 wrote:

not only hold the array of data as requested, but also additional info

void *data = GetSamples();

// Extract data
int version = * (int*) data;
unsigned int sampleCount = * (unsigned int*) (( (char*) data ) + sizeof(int))
double *samples = (double*) (( (char*) data ) + sizeof(int) + sizeof(unsigned int))

struct Samples
{
    int version;
    unsigned int sampleCount;
    double samples[];
};

void *data = GetSamples();
Samples *samples = (Samples*) data;

struct Samples
{
    int version;
    unsigned int sampleCount;
    double samples[];
};

// Calculate the size in bytes of our data block
size_t dataSizeNeeded = sizeof(int) + sizeof(unsigned int) + sizeof(double) * mySampleCount;
char *bytes = new char[dataSizeNeeded]; // Allocate enough bytes to hold the data
Samples *samples = (Samples*) bytes; // Treat it as if it was pointing to a Samples struct

samples->version = 1;
samples->sampleCount = mySampleCount;

for (size_t i = 0; i < mySampleCount; ++i)
{
    samples->samples[i] = ...;
}

// Now we have a properly initialized data block
ProcessSamples(samples);

delete [] bytes;

Niklas Lindquist wrote:

If one could design it all from the beginning, this would never have been discussed.

stephen_young wrote:

in CAppEx::InitInstance(),but there were nothing happaned.I

CPallini wrote:

for instance writing them inside the registry