有人可以向我提供示例 C 代码，其中列出了我可以使用 Createfile() 打开的所有设备名称吗？我总是收到错误代码 3:路径不存在

不起作用的示例代码:

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <windows.h>
#include <regstr.h>
#include <devioctl.h>
#include <usb.h>
#include <usbiodef.h>
#include <usbioctl.h>
#include <usbprint.h>
#include <setupapi.h>
#include <devguid.h>
#include <wdmguid.h>

#pragma comment(lib, "Setupapi.lib")
int main(void){
    HDEVINFO deviceInfoList;
    deviceInfoList = SetupDiGetClassDevs(NULL, NULL, NULL, DIGCF_ALLCLASSES | DIGCF_PRESENT);

    if (deviceInfoList != INVALID_HANDLE_VALUE)
    {
        SP_DEVINFO_DATA deviceInfoData;
        deviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
        for (DWORD i = 0; SetupDiEnumDeviceInfo(deviceInfoList, i, &deviceInfoData); i++)
        {
            LPTSTR buffer = NULL;
            DWORD buffersize = 0;
            while (!SetupDiGetDeviceInstanceIdA(deviceInfoList, &deviceInfoData, buffer, buffersize, &buffersize))
            {
                if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
                {
                    if (buffer) delete buffer;
                    buffer = new TCHAR[buffersize];
                }
                else
                {
                    printf("%ls\n", "error");
                    break;
                }
            }
            HANDLE hFile = CreateFileA(buffer,
                GENERIC_READ,
                0,
                NULL,
                OPEN_EXISTING,
                0,
                NULL);

            if (hFile == INVALID_HANDLE_VALUE) {
                printf("InvalidHandle, error code: %d\n", GetLastError());
            }
            CloseHandle(hFile);

            printf("%s\n", buffer);
            if (buffer) { delete buffer; buffer = NULL; }
        }
    }
    getchar();
}

我的目标是打印所有有效的设备名称并尝试获得一个有效的句柄，我可以稍后用户发送 ioctl`s

谢谢

编辑: 好的，这就是我现在得到的:

DWORD EnumerateDevices(){
    DWORD dwResult = 0;

    HDEVINFO hdev = SetupDiGetClassDevs(&GUID_DEVCLASS_BATTERY, 0, 0, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);// DIGCF_ALLCLASSES
    /*HDEVINFO hdev =SetupDiGetClassDevs(NULL,
        0, // Enumerator
        0,
        DIGCF_PRESENT | DIGCF_ALLCLASSES); */
    if (INVALID_HANDLE_VALUE != hdev) {
        for (int idev = 0; idev < 100; idev++)
        {
            SP_DEVICE_INTERFACE_DATA did = { 0 };
            did.cbSize = sizeof(did);

            if (SetupDiEnumDeviceInterfaces(hdev, NULL, &GUID_DEVCLASS_BATTERY, idev, &did))
            {
                DWORD cbRequired = 0;

                SetupDiGetDeviceInterfaceDetail(hdev,
                    &did,
                    NULL,
                    0,
                    &cbRequired,
                    0);
                if (ERROR_INSUFFICIENT_BUFFER == GetLastError())
                {
                    PSP_DEVICE_INTERFACE_DETAIL_DATA pdidd = (PSP_DEVICE_INTERFACE_DETAIL_DATA)LocalAlloc(LPTR, cbRequired);
                    if (pdidd) {
                        pdidd->cbSize = sizeof(*pdidd);
                        if (SetupDiGetDeviceInterfaceDetail(hdev, &did, pdidd, cbRequired, &cbRequired, 0)) {
                            wprintf(L"%s\n", pdidd->DevicePath);
                            HANDLE hBattery = CreateFile(pdidd->DevicePath,
                                GENERIC_READ | GENERIC_WRITE,
                                FILE_SHARE_READ | FILE_SHARE_WRITE,
                                NULL,
                                OPEN_EXISTING,
                                FILE_ATTRIBUTE_NORMAL,
                                NULL);
                            if (INVALID_HANDLE_VALUE != hBattery)
                            {
                                printf("Successfully opened Handle\n");
                                CloseHandle(hBattery);
                            }
                            else{
                                wprintf(L"CreateFile(%s) failed %d\n", pdidd->DevicePath, GetLastError());
                            }
                        }
                        else{
                            printf("SetupDiGetDeviceInterfaceDetail() failed %d\n", GetLastError());
                        }
                        LocalFree(pdidd);
                    }
                }
                else{
                    printf("SetupDiGetDeviceInterfaceDetail() failed %d\n", GetLastError());
                }
            }
            else  if (ERROR_NO_MORE_ITEMS == GetLastError())
            {
                printf("-NoMoreItems-");
                break;  // Enumeration failed - perhaps we're out of items
            }
        }
        SetupDiDestroyDeviceInfoList(hdev);
    }
    else{
        printf("SetupDiGetClassDevs() failed %d\n", GetLastError());
    }
    return dwResult;
}

我从这里偷得最多:https://msdn.microsoft.com/en-us/library/windows/desktop/bb204769(v=vs.85).aspx

我的输出是:

\\?\acpi#pnp0c0a#1#{72631e54-78a4-11d0-bcf7-00aa00b7b32a}
Successfully opened Handle
-NoMoreItems-

至少我得到了一个有效的句柄! 所以我想对系统上所有可用的设备执行此操作，该怎么做？

最佳答案

恕我直言，我不认为，您可以在 InstanceID 上执行 CreateFile。要执行 CreateFile，您需要设备的符号名称。您可以使用以下 SetupAPI，

• > SetupDiEnumDeviceInterfaces
• > SetupDiGetDeviceInterfaceDetail

两个 API 的 Remark 部分均声明，

SetupDiEnumDeviceInterfaces:: DeviceInterfaceData points to a structure that identifies a requested device interface. To get detailed information about an interface, call SetupDiGetDeviceInterfaceDetail. The detailed information includes the name of the device interface that can be passed to a Win32 function such as CreateFile (described in Microsoft Windows SDK documentation) to get a handle to the interface.

SetupDiGetDeviceInterfaceDetail:: The interface detail returned by this function consists of a device path that can be passed to Win32 functions such as CreateFile. Do not attempt to parse the device path symbolic name. The device path can be reused across system starts.

这可能对您有用，how to get DevicePath from DeviceID

关于c - 如何在 C 中将 IOCTL 发送到 Windows 上的所有驱动程序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32780782/