CODEWITHSUNDEEP
c++cpointers
peter61
peter61

Reputation: 279

Parsing string to pointer

Suppose I have the memory address as a string representation (say "0x27cd10"). How can I convert this to a pointer (void*)?

i.e.

int main() {
     const char* address = "0x29cd10";
     void* p;

     // I want p to point to address 0x29cd10 now...

     return 0;
}

Upvotes: 5

Views: 5573

Answers (3)

shanks3042
shanks3042

Reputation: 33

You can also do it like this:

std::string adr = "0x7fff40602780";
unsigned long b = stoul(address, nullptr, 16);
int *ptr = reinterpret_cast<int*>(b);

If you want to convert a string address to an object pointer, here is another example:

std::string adr= "0x7fff40602780";
unsigned long b= stoul(adr, nullptr, 16);
unsigned long *ptr = reinterpret_cast<unsigned long*>(b);
Example *converted = reinterpret_cast<Example*>(ptr);

Upvotes: 0

Jon Scobie
Jon Scobie

Reputation: 580

sscanf(address, "%p", (void **)&p);

No need for strtol or reinterpret_cast (which is C++ anyway and no good in C only).

Upvotes: 4

Ben Voigt
Ben Voigt

Reputation: 283713

strtol lets you specify the base (16, for hexadecimal, or 0 to auto-detect based on the 0x prefix in the input) when parsing the string. Once you have the pointer stored as an integer, just use reinterpret_cast to form the pointer.

Upvotes: 7

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