我正在尝试列出连接到我的系统的所有设备,并在搜索后发现此代码引发错误本地函数定义是非法的,有人可以解释一下它的含义。
或者是我的问题,因为我正在尝试使用来自 C++ 的代码。谢谢
工作代码
#include <windows.h>
#include <setupapi.h>
#include <stdio.h>
#pragma comment(lib,"SetupAPI")
void print_property
(
__in HDEVINFO hDevInfo,
__in SP_DEVINFO_DATA DeviceInfoData,
__in PCWSTR Label,
__in DWORD Property
)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
//
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
Property,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (ERROR_INSUFFICIENT_BUFFER == GetLastError())
{
// Change the buffer size.
if (buffer)
{
LocalFree(buffer);
}
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = (LPTSTR)LocalAlloc(LPTR, buffersize * 2);
}
else
{
break;
}
}
wprintf(L"%s %s\n",Label, buffer);
if (buffer)
{
LocalFree(buffer);
}
}
int main()
{
//int setupdi_version()
//{
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(
NULL,
0, // Enumerator
0,
DIGCF_PRESENT | DIGCF_ALLCLASSES);
if (INVALID_HANDLE_VALUE == hDevInfo)
{
// Insert error handling here.
return 1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i = 0; SetupDiEnumDeviceInfo(hDevInfo, i, &DeviceInfoData); i++)
{
LPTSTR buffer = NULL;
DWORD buffersize = 0;
print_property(hDevInfo, DeviceInfoData, L"Friendly name :", SPDRP_FRIENDLYNAME);
while (!SetupDiGetDeviceInstanceId(
hDevInfo,
&DeviceInfoData,
buffer,
buffersize,
&buffersize))
{
if (buffer)
{
LocalFree(buffer);
}
if (ERROR_INSUFFICIENT_BUFFER == GetLastError())
{
// Change the buffer size.
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = (LPTSTR)LocalAlloc(LPTR, buffersize * 2);
}
else
{
wprintf(L"error: could not get device instance id (0x%x)\n", GetLastError());
break;
}
}
if (buffer)
{
wprintf(L"\tDeviceInstanceId : %s\n", buffer);
}
print_property(hDevInfo, DeviceInfoData, L"\tClass :", SPDRP_CLASS);
print_property(hDevInfo, DeviceInfoData, L"\tClass GUID :", SPDRP_CLASSGUID);
}
if (NO_ERROR != GetLastError() && ERROR_NO_MORE_ITEMS != GetLastError())
{
// Insert error handling here.
return 1;
}
// Cleanup
SetupDiDestroyDeviceInfoList(hDevInfo);
system ("pause");
return 0;
}