禁用所有活动网卡（支持还原）

#include <Windows.h>
#include <SetupAPI.h>
#include <devguid.h>
#include <Cfgmgr32.h>

#pragma comment(lib,"Setupapi.lib")

ULONG NetCardIndex[16];
//参数为FALSE可以将活动网卡禁用，而后用参数TRUE调用
//可以将之前被禁用的网卡启动，并且不会启动非本函数禁用的网卡。
//该方法不支持WOW64，在64位系统中必须以64位代码执行。
ULONG ChangeNetCardStatus(BOOL Enable)
{
	HDEVINFO				DeviceInfoSet;
	SP_DEVINFO_DATA			DeviceInfoData;
	ULONG					DeviceIndex;
	CHAR					Buffer[64];
	DWORD					Size;
	ULONG					Status;
	ULONG					ProblemNumber;
	SP_PROPCHANGE_PARAMS	PropchangeParams;
	DWORD					ChangedCount;

	ChangedCount = 0;
	DeviceInfoSet = SetupDiGetClassDevsA(
		&GUID_DEVCLASS_NET,
		NULL,
		NULL,
		DIGCF_PRESENT);

	SecureZeroMemory(&DeviceInfoData, sizeof(SP_DEVINFO_DATA));
	DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
	DeviceIndex = 0;

	while (SetupDiEnumDeviceInfo(
		DeviceInfoSet,
		DeviceIndex,
		&DeviceInfoData) && DeviceIndex < 16)
	{
		DeviceIndex++;
		if (Enable && NetCardIndex[DeviceIndex - 1] == 0)
			continue;
		if (!SetupDiGetDeviceRegistryPropertyA(
			DeviceInfoSet,
			&DeviceInfoData,
			SPDRP_LOCATION_INFORMATION,
			NULL,
			(PBYTE)&Buffer,
			sizeof(Buffer),
			&Size))
		{
			continue;
		}
		if (CR_SUCCESS != CM_Get_DevNode_Status(&Status, &ProblemNumber, DeviceInfoData.DevInst, 0))
			continue;
		//if (Status & DN_WILL_BE_REMOVED)
		//	continue;
		if (Enable == FALSE && Status & DN_HAS_PROBLEM && ProblemNumber == CM_PROB_DISABLED)
			continue;

		PropchangeParams.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
		PropchangeParams.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
		PropchangeParams.Scope = DICS_FLAG_GLOBAL;
		PropchangeParams.StateChange = Enable ? DICS_ENABLE : DICS_DISABLE;
		if (FALSE == SetupDiSetClassInstallParamsA(DeviceInfoSet, &DeviceInfoData, (PSP_CLASSINSTALL_HEADER)&PropchangeParams, sizeof(PropchangeParams)))
		{
			printf("SetupDiSetClassInstallParamsA: %08X\n", GetLastError());
			continue;
		}
		if (FALSE == SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, DeviceInfoSet, &DeviceInfoData))
		{
			printf("SetupDiCallClassInstaller: %08X\n", GetLastError());
		}
		NetCardIndex[DeviceIndex - 1] = 1;
		ChangedCount++;
	}

	if (DeviceInfoSet) {
		SetupDiDestroyDeviceInfoList(DeviceInfoSet);
	}
	return ChangedCount;
}

int main()
{
	SecureZeroMemory(&NetCardIndex, sizeof(NetCardIndex));
	ChangeNetCardStatus(FALSE);
	SleepEx(10 * 1000, TRUE);
	ChangeNetCardStatus(TRUE);
	return 0;
}