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Question

1）原型
WINSETUPAPI
BOOL
WINAPI
SetupDiSetClassInstallParamsA(
    IN HDEVINFO                DeviceInfoSet,
    IN PSP_DEVINFO_DATA        DeviceInfoData,        OPTIONAL
    IN PSP_CLASSINSTALL_HEADER ClassInstallParams,    OPTIONAL
    IN DWORD                   ClassInstallParamsSize
    );[DllImport("setupapi.dll", SetLastError = true, CharSet = CharSet.Auto)]static extern bool SetupDiSetClassInstallParams(IntPtr DeviceInfoSet, ref SP_DEVINFO_DATA DeviceInfoData, ref SP_CLASSINSTALL_HEADER ClassInstallParams, int ClassInstallParamsSize);2）typedef struct _SP_CLASSINSTALL_HEADER {
    DWORD       cbSize;
    DI_FUNCTION InstallFunction;
} SP_CLASSINSTALL_HEADER, *PSP_CLASSINSTALL_HEADER; [StructLayout(LayoutKind.Sequential)]
        public struct SP_CLASSINSTALL_HEADER
        {
            public UInt32 cbSize;
            public uint InstallFunction;
        }3）typedef struct _SP_PROPCHANGE_PARAMS {
    SP_CLASSINSTALL_HEADER ClassInstallHeader;
    DWORD                  StateChange;
    DWORD                  Scope;
    DWORD                  HwProfile;
} SP_PROPCHANGE_PARAMS, *PSP_PROPCHANGE_PARAMS;  [StructLayout(LayoutKind.Sequential)]
        public struct SP_PROPCHANGE_PARAMS
        {
            public SP_CLASSINSTALL_HEADER ClassInstallHeader;
            public UInt32 StateChange;
            public UInt32 Scope;
            public UInt32 HwProfile;
        }问题：
1）这几个写法是否有问题？
2）
  SP_PROPCHANGE_PARAMS spPropChangeParam = new SP_PROPCHANGE_PARAMS();
            spPropChangeParam.Scope = 0x00000001;
            spPropChangeParam.StateChange = 0;
            spPropChangeParam.ClassInstallHeader.cbSize = (UInt32)System.Runtime.InteropServices.Marshal.SizeOf(spPropChangeParam.ClassInstallHeader);
            spPropChangeParam.ClassInstallHeader.InstallFunction = 0x00000012;
            SetupDiSetClassInstallParams(NewDeviceInfoSet, ref spData, ref spPropChangeParam.ClassInstallHeader, System.Runtime.InteropServices.Marshal.SizeOf(spPropChangeParam));调用不成功，GetLastError错误值87（参数不正确)，哪里出问题了？
NewDeviceInfoSet和spData参数应该没有问题。谢谢

Answer 1

from
http://www.devmedia.com.br/articles/viewcomp.asp?comp=4092&hl=
先看看别人是怎么用的public const int DIGCF_PRESENT = 2;
public const int DIF_PROPERTYCHANGE = 0x00000012;
public const int DICS_FLAG_GLOBAL = 0x00000001;
public const int INVALID_HANDLE_VALUE = -1;
public const int DICS_ENABLE = 0x00000001;
public const int DICS_DISABLE = 0x00000002;
public const string USBVIDPID = @"USB\VID_0403&PID_6001\A1000PRA";[StructLayout(LayoutKind.Sequential)]
public struct SP_CLASSINSTALL_HEADER
{
    public int cbSize;
    public int InstallFunction;
}[StructLayout(LayoutKind.Sequential)]
public struct SP_PROPCHANGE_PARAMS
{
    public SP_CLASSINSTALL_HEADER ClassInstallHeader;
    public int StateChange;
    public int Scope;
    public int HwProfile;
    public void Init()
    {
        ClassInstallHeader = new SP_CLASSINSTALL_HEADER();
    }
}[StructLayout(LayoutKind.Sequential)]
public struct SP_DEVINFO_DATA
{
    public int cbSize;
    public Guid ClassGuid;
    public int DevInst;
    public int Reserved;
}[DllImport("setupapi.dll")]
public static extern bool SetupDiEnumDeviceInfo(
    IntPtr DeviceInfoSet,
    int Supplies,
    ref SP_DEVINFO_DATA DeviceInfoData);[DllImport("setupapi.dll")]
public static extern bool SetupDiSetClassInstallParams(
    IntPtr DeviceInfoSet,
    ref SP_DEVINFO_DATA DeviceInfoData,
    ref SP_CLASSINSTALL_HEADER ClassInstallParams,
    int ClassInstallParamsSize);[DllImport("setupapi.dll")]
public static extern bool SetupDiCallClassInstaller(
    int InstallFunction,
    IntPtr DeviceInfoSet,
     ref SP_DEVINFO_DATA DeviceInfoData);static bool StateChange(int NewState, int SelectedItem, IntPtr hDevInfo)
{
    SP_PROPCHANGE_PARAMS PropChangeParams;
    SP_DEVINFO_DATA DeviceInfoData;
    PropChangeParams = new SP_PROPCHANGE_PARAMS();
    PropChangeParams.Init();
    DeviceInfoData = new SP_DEVINFO_DATA();
    PropChangeParams.ClassInstallHeader.cbSize
        = Marshal.SizeOf(PropChangeParams.ClassInstallHeader);
    DeviceInfoData.cbSize = Marshal.SizeOf(DeviceInfoData);
    if (!SetupDiEnumDeviceInfo(hDevInfo, SelectedItem, ref DeviceInfoData))
        return false;
    
    PropChangeParams.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
    PropChangeParams.Scope = DICS_FLAG_GLOBAL;
    PropChangeParams.StateChange = NewState;
    if (!SetupDiSetClassInstallParams(
        hDevInfo,
        ref DeviceInfoData,
        ref PropChangeParams.ClassInstallHeader,
        (int)Marshal.SizeOf(PropChangeParams)))
        return false;
    if (!SetupDiCallClassInstaller(
        DIF_PROPERTYCHANGE,
        hDevInfo,
        ref DeviceInfoData))
        return false;
    return true;
}

Answer 2

谢谢，问题出在spPropChangeParam.StateChange = 0;所以返回参数不正确。改成 spPropChangeParam.StateChange = 1;就ok了