Covert String to LPVOID and LPCWSTR in C++

Question

I’m working with the winHTTP API in c++ and I have started to write a wrapper class for my application. For simplicity I have a number of functions that can take string parameters and use them in the winHTTP calls. However many of these require the data to be LPVOID or LPCWSTR. I can make it all work by making my wrapper functions take LPVOID or LPCWSTR parameters, but I would prefer string parameters. So is there any way to covert from sting to LPVOID/ LPCWSTR?

My attempts (below) just produced jibberish

bool httpWrapper::setPostData(const string &postData){

 _postData = (LPVOID)postData.c_str();

 _postData_len = 47;

 return false;
}

Any help would be much appreciated

Thanks

Answer 1

Use this:

bool httpWrapper::setPostData(const string &postData){ 

 _postData = (LPWSTR)postData.c_str(); 

 _postData_len = 47; // Something else, actually.

 return false; 
}

LPWSTR _postData;

You can pass a LPWSTR to methods which expect a LPCWSTR. So you can work with strings.

btw, did you just try passing the string itself? I would expect that to work too and is better than getting a LPWSTR out.

So, in that case it would look like:

bool httpWrapper::setPostData(const string &postData){ 

 _postData = postData; 

 _postData_len = 47; // Whatever.

 return false; 
}
string _postData;