急急急，在线求助！！

[dsd999]

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

[王集鹄]

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;
}

[dsd999]

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