WAVEFORMATEX对象为什么找不到

[HELLO_wallace]

我包含了#include "mmsystem.h"也连接了winmm.lib 库
但是在生成WAVEFORMATEX对象并初始化对象时，却出现如下错误，是什么 原因呢？
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(36) : error C2065: 'waveformat' : undeclared identifier
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(36) : error C2228: left of '.wFormatTag' must have class/struct/union type
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(37) : error C2228: left of '.nChannels' must have class/struct/union type
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(38) : error C2228: left of '.nSamplesPerSec' must have class/struct/union type
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(38) : error C2065: 'SAMPLE_RATE' : undeclared identifier
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(39) : error C2228: left of '.nAvgBytesPerSec' must have class/struct/union type
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(40) : error C2228: left of '.nBlockAlign' must have class/struct/union type
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(41) : error C2228: left of '.wBitsPerSample' must have class/struct/union type
C:\Documents and Settings\whl\桌面\hhhhh\Sound.cpp(42) : error C2228: left of '.cbSize' must have class/struct/union type

[rageliu]

Mmreg.h试试

[HELLO_wallace]

试过了不行，我的这些操作时放在一个自定义类里的，
我换成直接在对话框里设置发现能够成功，这是为什么呢？

[HELLO_wallace]

拼写错误不好意思！