Question

I have a question about vector push_back().I am writing a code to acquire image into the buffer and store them inside a vector.I checked that I may need to use push_back(),But I am not sure right now how should I format pImageBuffer that I can store it into the vector.Maybe it is another easy question,but I have been trying a whole morning but still confused.I hope someone can give me some light.Thanks very much in advance!!

the Result.Buffer() is from a camera SDK,it will renew by StreamGrabber.QueueBuffer.My problem is whenever I build I got error like :

std::vector<_Ty>::push_back’: Konvertierung des Parameters 1 von ‘const uint8_t *’ in ‘unsigned char *const &’ not possible

My code is some how like this.
….

std::vector<uint8_t *> images(100);// here is the problem ,it needs a "const",or    delete const down const uint8_t *pImageBuffe.Thanks very much guys for your answers!!!

while(1){
....

 const uint8_t *pImageBuffer = (uint8_t *) Result.Buffer();// Here I get the image data

 images.push_back(pImageBuffer);// This is obvious wrong,but I am not sure in side (),what should I do 

 StreamGrabber.QueueBuffer(Result.Handle(), NULL);

...
}

Answer 1

You have a const uint8_t*, but your container stores uint8_t*.

Also note that you’re adding a 100^th, 101^st, 102^nd element there, not filling the 0^th, 1^st, 2^nd…

You may want:

std::vector<const uint8_t*> images(100);

size_t i = 0;
while (i < 100) {
  // ..
  const uint8_t* pImageBuffer = (uint8_t*)Result.Buffer();
  images[i++] = pImageBuffer;
  // ..
}

Or you may want:

std::vector<const uint8_t*> images;

while (true) {
  // ..
  const uint8_t* pImageBuffer = (uint8_t*)Result.Buffer();
  images.push_back(pImageBuffer);
  // ..
}

Or you may want combinations without the const.