Hi Eric,
On Wed, Apr 23, 2014 at 7:07 PM, Eric.Yang <[email protected]> wrote:
> Hi all,
>
> I have a class called Security and it is used for data encryption.
>
> I want to use embind to export functions for js.
>
> class Security {
> public:
> Security ();
> bool encryptData(int encryptType, char * data, int dataLen);
> bool decryptData(int encryptType, char * data, int dataLen);
> }
>
Are 'data' and 'dataLen' in encryptData and decryptData input or output
parameters? If input parameters, perhaps you should mark 'data' as const
char*. But that's tangential to your question...
The easiest way to get a binary blob of data from JavaScript into C++ is to
pass a std::string, which is simply a typedef of std::basic_string<char>.
std::string is roughly equivalent to a std::vector<char>, so it's commonly
used as a blob of binary data.
Thus, I would recommend writing your bindings as such:
bool encryptDataWrapper(Security& this_, int encryptType, const
std::string& data) {
return this_.encryptData(encryptType, data.data(), data.size());
}
bool decryptDataWrapper(Security& this_, int encryptType, const
std::string& data) {
return this_.decryptData(encryptType, data.data(), data.size());
}
EMSCRIPTEN_BINDINGS(security) {
class_<Security>("Security")
.constructor<>()
.function("encryptData", &encryptDataWrapper)
.function("decryptData", &decryptDataWrapper)
;
}
2. How do I use encrypData/decrypData in JS ?
> var data = "dataString";
> var sec = new Module.Security();
> sec.encrypData(1, data, data.length);
>
With the bindings above, you could write:
var data = "dataString";
var sec = new Module.Security();
sec.encryptData(1, data);
Does that help?
--
Chad Austin
Technical Director, IMVU
http://engineering.imvu.com <http://www.imvu.com/members/Chad/>
http://chadaustin.me
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