(Win32 API) GetRegionData

include <cassert>


int main()
{
  //Create an elliptic region
  HRGN r = CreateEllipticRgn(2,3,6,10);
  const int size = GetRgnDataSize(r);
  RGNDATA * const d = (RGNDATA*)std::malloc(sizeof(RGNDATA) + (size * sizeof(char)));
  assert(d!=0 || !"Memory allocation RGNDATA failed");
  const int getRegionDataVal = GetRegionData(r,size,d);
  assert(getRegionDataVal > 0);
  //Free the RGNDATA
  std::free(d);
}

include <cassert>


int GetRgnDataSize(const HRGN region)
{
  int size = 10;
  for ( ; ; size*=10)
  {
    RGNDATA * const d = (RGNDATA*)std::malloc(sizeof(RGNDATA) + (size * sizeof(char)));
    assert(d!=0 || !"Memory allocation RGNDATA failed");
    //Get the data size
    const int getRegionDataVal = GetRegionData(region,size,d);
    std::free(d);
    if (getRegionDataVal > 0) return getRegionDataVal;
  }
}

Code links

• assert
• const