vc vb dll 参数传递

vb默认 byref   vc 默认 byval
stdcall方式不能传递浮点,变通方法传递浮点变量的指针.
byte       unsigned char
integer  short
bool       short
long       int
single    float
double  double


 //vc char *vb byval variable as String
  //vc指针的指针  vb any

LPSTR *      byref  variable as String

  //Private Declare Function wpfnDllTest Lib "dllTest.dll" (w ) As Integer  等价于 byval w as Variant
//Private Declare Function wpfnDllTest Lib "dllTest.dll" (w As Any) As Integer  Any w是什么就传递什么,无类型匹配检查