编译DirectSound示例代码出现这些错误是什么原因?error C2065: 'PCMWAVEFORMAT' : undeclared identifier
D:\SDK\DXSDK\Samples\C++\common\src\dsutil.cpp(1258) : error C2065: 'PCMWAVEFORMAT' : undeclared identifier
D:\SDK\DXSDK\Samples\C++\common\src\dsutil.cpp(1258) : error C2146: syntax error : missing ';' before identifier 'pcmWaveFormat'
D:\SDK\DXSDK\Samples\C++\common\src\dsutil.cpp(1258) : error C2065: 'pcmWaveFormat' : undeclared identifier
D:\SDK\DXSDK\Samples\C++\common\src\dsutil.cpp(1287) : error C2228: left of '.wf' must have class/struct/union type
D:\SDK\DXSDK\Samples\C++\common\src\dsutil.cpp(1287) : error C2228: left of '.wFormatTag' must have class/struct/union type