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请教cyapi的问题
在做cyapi的时候,我在他们提供的例子上看到以下代码:
UCHAR *outContext = dlg->OutEndpt->BeginDataXfer(data,outlen,&outOvLap); UCHAR *inContext = dlg->InEndpt->BeginDataXfer(inData,inlen,&inOvLap); dlg->OutEndpt->WaitForXfer(&outOvLap,2000); dlg->InEndpt->WaitForXfer(&inOvLap,2000); success = dlg->OutEndpt->FinishDataXfer(data, outlen, &outOvLap,outContext); success = dlg->InEndpt->FinishDataXfer(inData,inlen, &inOvLap,inContext); 感觉输出和输入几乎同时进行,这样能保证没问题吗? 还有我想把这两者分开,请问有数据输入时是由什么消息触发的? 谢谢了. |
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