shfileOperation问题？

Question

SHFILEOPSTRUCT shFileOpStruct;

shFileOpStruct.wFunc=FO_COPY; //拷贝
shFileOpStruct.pFrom= lpFrom; //From
shFileOpStruct.pTo=lpTo; //To
shFileOpStruct.fFlags =FOF_ALLOWUNDO; // //SHFileOperation
int iReturn=::SHFileOperation(&shFileOpStruct);================================================================
上面这段代码在拷贝大文件时为什么没有进度条？

Answer 1

shFileOpStruct.fFlags =FOF_ALLOWUNDO | FOF_SIMPLEPROGRESS ;