VC6中处理WM_DEVICECHANGE,获得U盘盘符,但当U盘有CD-ROM分区时获得重复盘符,怎么解决?

[gothonic]

WINDOWS XP下拦截WM_DEVICECHANGE消息
目的是检测有否U盘插入,并发U盘盘符显示在ListBox中
但当U盘有CD-ROM分区时,盘符发生重复怎么解决?
代码如下:

LRESULT OnDeviceChange(HWND hwnd,WPARAM wp,LPARAM lp)
{
PDEV_BROADCAST_HDR lpdb=(PDEV_BROADCAST_HDR)lp;
TCHAR c[3];

switch(wp)
{
case DBT_DEVICEARRIVAL:
if(lpdb->dbch_devicetype==DBT_DEVTYP_VOLUME)
{
PDEV_BROADCAST_VOLUME lpdbv=(PDEV_BROADCAST_VOLUME)lpdb;
c[0]=FirstDriveFromMask(lpdbv->dbcv_unitmask)+32;
c[1]=':';
c[2]='\0';
SendMessage(hListBox,LB_ADDSTRING,0,(LPARAM)c);
}
break;
case DBT_DEVICEREMOVECOMPLETE:
SendMessage(hListBox,LB_RESETCONTENT,0,0);
FindU(hwnd);
break;
}
return 0;
}

[cnzdgs]

dbcv_unitmask中可以包含多个盘符，你需要逐一取出。

[CathySun118]

size_t szAllDriveStrings = GetLogicalDriveStrings(0,NULL);
char *pDriveStrings = new char[szAllDriveStrings + sizeof(_T( " "))];
GetLogicalDriveStrings(szAllDriveStrings,pDriveStrings);
size_t szDriveString = strlen(pDriveStrings);
while(szDriveString > 0)
{
AfxMessageBox(pDriveStrings);
pDriveStrings += szDriveString + 1;
szDriveString = strlen(pDriveStrings);
}

// pDriveStrings 就索盘符撒
---------------------------------------------------------------

DiskType=GetDriveType(strTempDirver);
switch(DiskType)
{
case DRIVE_NO_ROOT_DIR:
return;
case DRIVE_REMOVABLE:
//::AfxMessageBox( "移动存储设备 ");
break;
case DRIVE_FIXED:
//::AfxMessageBox( "固定硬盘驱动器 ");
break;
case DRIVE_REMOTE:
//::AfxMessageBox( "这是网络驱动器 ");
return;
case DRIVE_CDROM:
//::AfxMessageBox( "这是光盘驱动器 ");
return;

[Kudeet]

API GetDriveType可以判断DRIVE的类型，例如DRIVE_CDROM DRIVE_REMOVABLE

[knowledge_Is_Life]

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