Windows parameter

[shuji]

Can someone help me with this:
I have a library which I try to import from D
//funcs.lib
//windows includes...
HWND hwnd;
int setHWND(HWND extHwnd){
	hwnd = extHwnd;
	return 0;
}

//main.d
pragma(lib, "gdi32.lib");
import core.runtime;
import core.sys.windows.windows;
extern (C++) {
	int setHWND(HWND hwnd);
}
int main(int argc, char **argv) {
//windows initializers
	setHWND(hwnd);
	return 0;
}

but when I try to import that function this comes:
    Error 42: Symbol Undefined ?setHWND@@YAHPAX at Z (int cdecl
setHWND(void *))
--- errorlevel 1

it seems like I cannot use HWND directly.