Question

uint8_t* baseAddress = CVPixelBufferGetBaseAddress(imageBuffer); 
    void* free_me = 0;
    if (true) { // iOS bug?
        uint8_t* tmp = baseAddress;
        int bytes = bytesPerRow*height;
        free_me = baseAddress = (uint8_t*)malloc(bytes);
        baseAddress[0] = 0xdb;
        memcpy(baseAddress,tmp,bytes);
    }

This program is found in zxing package, what does this sentence “void* free_me = 0;” mean? What does this program do? Any tips will be appreciated.

Answer 1

void* free_me = 0 declares a “generic” pointer free_me and gives it the value 0

Generic pointers may be used, pretty much as any other pointer (int*,char*,etc), with the exception that pointers to void can actually point to ANY data type.