Error while calling external library functions

Question

Using visual studio I wrote the following code test javascript communication with external C/C++ libraries:
aabc.cpp :
extern "C" __declspec(dllexport) char* ESInitialize (TaggedData* argv, long argc);
extern "C" __declspec(dllexport) long ESGetVersion (void );
extern "C" __declspec(dllexport) void ESFreeMem (void* p);
extern "C" __declspec(dllexport) void ESTerminate (void );
extern "C" __declspec(dllexport) double AddNumbers(void);
double AddNumbers(double a, double b)
return a + b;
long ESGetVersion (void){
return 5;
And the code that I wrote in javascript is:
var obj = new ExternalObject("lib: aabc.dll");
alert(obj.version);
var aa = obj.AddNumbers(10, 20);
alert(aa);
It seems to me that it loaded successfully due to the output I am getting from the second statement. But I am getting error at the third statement where I called AddNumbers(10,20) function.
Somebody help me.
Thanks in advance,
sailu

Answer 1

I have the same problem. This is my code:
extern "C" __declspec(dllexport) char* ESInitialize (TaggedData* argv, long argc);
extern "C" __declspec(dllexport) long ESGetVersion (void );
extern "C" __declspec(dllexport) void ESFreeMem (void* p);
extern "C" __declspec(dllexport) void ESTerminate (void );
extern "C" __declspec(dllexport) int AddNumbers(int a, int b);
extern "C" __declspec(dllexport) char* ESInitialize (TaggedData* argv, long argc)
return "AddNumbers_dd";
int AddNumbers(int a, int b)
return a + b;
long ESGetVersion (void){
return 17;
And the code that I wrote in javascript is:
var obj = new ExternalObject("lib: mydll.dll");
var x = obj.AddNumbers(10, 20);
alert(x);
The version of the library is correct, but when I try to use the function "AddNumbers" I receive this error "AddNumbers is not function".
What would be the correct procedure to call a function inside a DLL?