typedef void（* ptr）（argumentlist）问题

Question

如何向/从此函数指针传递或获取参数值：

typedef void(*  CreateCursorBitmapProc )(uchar *bitmapBuffer, uint32 *width, uint32 *height, bool16 *hasAlpha) 

bitmapBuffer，width，height，hasalpha是out参数。

Answer 1

// Grab an instance from somewhere...
CreateCursorBitmapProc instance = ...;

// Declare output variables
// should be initialized to some buffer, probably
uchar *bitmapBuffer = new uchar[size_of_buffer]; 
uint32 width, height;
bool16 hasAlpha;
(*instance)(bitmapBuffer, &width, &height, &hasAlpha);