WaveInOpen调用狂出错,毕业设计,急呀
Jimy 2006-05-14 12:51:10 我的毕业设计是做一个录音程序,并实时传输,但我在录音的时候遇到一个问题,怎么也解决不了(菜鸟一只),希望高手帮忙解决! 要交了,急呀!
private
{ Private declarations }
FWaveFmt : TWaveFormatEx;//Delphi中,WAVEFORMAT和PCMWAVEFORMAT合为TwaveFormatEx。
WaveHandle : PHWaveIn;
WaveHdr1 : PWAVEHDR; //数据缓冲区头结构的指针
WaveBuffer1 : lpstr; //数据缓冲区的指针
public
{ Public declarations }
end;
var
Frecorder: TFrecorder;
implementation
{$R *.dfm}
procedure TFrecorder.Button2Click(Sender: TObject);
begin
Close;
end;
procedure CallBack(uMsg,dwInstance,dwParam1,dwParam2 : DWORD); stdcall;
var
i:Integer;
SPByte : ^Byte; //假设在打开设备时采用8位量化
SingleData : Integer;
Begin
case uMsg of //uMsg是Windows的消息标记号
MM_WIM_OPEN : //波形输入设备开启成功发回的消息
showmessage('波形输入设备开启成功');
MM_WIM_DATA : //一个缓冲区已满发回的消息
begin
showmessage('一个缓冲区已满');
SPByte := Pointer(dwParam1);
For i :=0 to ??? do //这个地方也不明白
begin
SingleData := SPByte^; //通过SPByte来访问缓冲区中的数据
Inc(SPByte);
end;
end;
MM_WIM_CLOSE : //波形输入设备关闭成功发回的消息
showmessage('波形输入设备关闭成功');
end;
End;
procedure TFrecorder.Button1Click(Sender: TObject);
Var
res : MMRESULT;
begin
FWaveFmt.wFormatTag:=WAVE_FORMAT_PCM; //采样数据格式,目前只能用PCM格式
FWaveFmt.wBitsPerSample:=8;
FWaveFmt.nChannels:=2;
FWaveFmt.nSamplesPerSec:=11025; //采样速率
FWaveFmt.nAvgBytesPerSec:=22050; //每秒采样得到的数据
FWaveFmt.nBlockAlign:=2; //记录区块对齐的单位
res:=WaveInOpen(WaveHandle,Wave_Mapper,@FRecorder.FwaveFmt,
DWORD(@callback),DWORD(@self),CALLBACK_FUNCTION + WAVE_ALLOWSYNC);
case res of
MMSYSERR_ALLOCATED: showmessage('资源已存在');
MMSYSERR_BADDEVICEID:showmessage('装置ID超出范围.');
MMSYSERR_NODRIVER:showmessage('没有驱动.');
MMSYSERR_NOMEM:showmessage('不能分配内存.');
WAVERR_BADFORMAT:showmessage('企图打开一个不被支持的格式.');
end;
WaveHdr1:=GlobalAllocPtr(GHND or GMEM_SHARE,Sizeof(WAVEHDR));
WaveBuffer1:=GlobalAllocPtr(GHND or GMEM_SHARE,2048);
WaveHdr1.lpData := WaveBuffer1;
WaveHdr1.dwBufferLength:=2048;
WaveInPrepareHeader(waveHandle^,WaveHdr1, sizeof(WAVEHDR)); //保证缓冲区不会被置换到硬盘上
WaveInAddBuffer(WaveHandle^, WaveHdr1, sizeof(WAVEHDR));
//开始录音
WaveInUnprepareHeader(WaveHandle^,WaveHdr1, sizeof(TWAVEHDR));
GlobalFreePtr(WaveBuffer1);
end;
运行后,会出现读地址错的情况,因为waveHandle=nil,为虾米呀??
如果 res:=WaveInOpen(@WaveHandle,Wave_Mapper,@FRecorder.FwaveFmt,
DWORD(@callback),DWORD(@self),CALLBACK_FUNCTION + WAVE_ALLOWSYNC);
就会出现access violent。
还有,请教一下,如果回调函数用线程方式的话要怎么做?
别人的号,分数如果不够请多包涵。QQ545723024