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用DS3.2做的USB驱动，插上设备瞬间用BUSHOUND看到的通讯数据正常，设备也能枚举也可以成功打开和关闭，但用WriteFile和ReadFile对设备进行写操作时，BUSHOUND没有看到任何数据。驱动中IRP_MJ_READ对应BULK模式的端点1的IN。IRP_MJ_WRITE对应BULK的端点2的OUT。Queue Type为Queue，Buffer Access为Direct。<br /> 我用的是异步方式，应用程序的WriteFile后面代码如下：<br />if (!WriteFile(<br /> g_hDevice,<br /> InBuffer,<br /> 64,<br /> &nBytes,<br /> &(ioItem.IoOverlapped)))<br /> {<br /> <br /> if(GetLastError()!=ERROR_IO_PENDING)<br /> MessageBox("WriteError");<br /> }<br /> switch(WaitForSingleObject(ioItem.IoOverlapped.hEvent,1000))//等待1000ms<br /> {<br /> case WAIT_OBJECT_0:<br /> <br /> if(!::GetOverlappedResult(g_hDevice,&ioItem.IoOverlapped,&nBytes,TRUE))<br /> MessageBox("Write Error");<br /> else<br /> {<br /> CString ks;<br /> ks.Format("%d Bytes Writed",nBytes);<br /> MessageBox(ks);<br /> }<br /> break;<br /> case WAIT_TIMEOUT://超时错误<br /> MessageBox("Write Over Time");<br /> break;<br /> default:<br /> MessageBox("Write Error");<br /> break;<br /> }<br />WriteFile返回ERROR_IO_PENDING正常，执行WaitForSingleObject后返回WAIT_OBJECT_0也正常，但用GetOverlappedResult获取到的写入字节数量一直是0。关键是BUSHOUND看不到WriteFile所执行的任何数据流，不解？ |
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楼主
