我目前正在尝试 P/Invoke 到 HID（在 Unity 中（因此使用 .Net 2.0））。但是，当调用SetupDiGetDeviceInterfaceDetail时，它返回错误代码1784。
注意：这是第二次调用，因为第一次调用应该（并且确实）返回错误 122，并设置所需的缓冲区大小。
..Replaced With Full Source Below..
使用的结构：
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目前未使用 DETAIL_DATA，因为我发现我应该使用 IntPtr 来代替。
如何摆脱错误 1784 并获取/迭代我的设备路径？另外，我读到我应该使用“null”，而不是 dData，但这也会出错（无法将 null 转换为 DEVICE_INTERFACE_DATA）
编辑：完整来源
调试输入.cs：
using UnityEngine;
using System.Collections;
using System;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
using Assets;
public class DebugInput : MonoBehaviour {
static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () { …我有一个非托管 C++ DLL 和一个使用 P/Invoke 进行通信的 .net 应用程序。我需要从 C++ DLL 更新 .net 应用程序中的字典。
我尝试通过以下方式做到这一点：
public delegate void MyDelegate(string address, string username);
[DllImport("MyDLL.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void SaveMyDelegate(MyDelegate callback);
private static SortedDictionary<string, string> dict = new SortedDictionary<string, string>();
public void save_delegate() {
SaveMyDelegate(delegate(string address, string username) {
if (username != "") {
dict.Add(address, username);
}
});
}
在 C++ 方面我有：
typedef void (*MANAGED_CALLBACK)(string user_address, string username);
extern "C" __declspec(dllexport) void SaveMyDelegate(MANAGED_CALLBACK callback);
MANAGED_CALLBACK my_callback;
void SaveMyDelegate(MANAGED_CALLBACK callback) { …我是从vb到vb.net的API转换的初学者。在vb6中，它们使用user32 DLL。在Vb.Net中，我需要调用LockWindowUpdate Function（）而不使用“ User32.dll”函数。
在不使用vb.net中任何API调用的情况下，有什么方法可以锁定窗口状态？
如果等效的话，请让我告诉我这些代码。该代码应在.net框架中使用。
VB
Private Declare Function LockWindowUpdate Lib "user32"
(ByVal hWnd As Long) As Long
LockWindowUpdate Form1.hWnd
我被赋予了在Visual Studio 2010 C#中使用pfxlibn.dll的任务,我从中可以看出它是一个Powerflex库.http://pfxcorp.com/clib-fns.htm
我尝试了一些导入PclGetField函数的变体,例如:
[DllImport("pfxlibn.dll", SetLastError = true)]
public static extern void PclGetField(
Int32 iHandle,
Int32 iFieldNum,
[MarshalAs(UnmanagedType.LPStr)] string Date
);
[DllImport("pfxlibn.dll",
CallingConvention = CallingConvention.StdCall,
CharSet = CharSet.Ansi,
EntryPoint = "PclGetField")]
public static extern int PclGetField(Int32 iHandle, Int32 iFieldNum, string Data)
[DllImport("pfxlibn.dll", EntryPoint = "PclGetField",
ExactSpelling = true,
CharSet = CharSet.Ansi,
CallingConvention = CallingConvention.Cdecl)]
public static extern Int32 PclGetField(Int32 iHandle, Int32 iFieldNum,[MarshalAs(UnmanagedType.VBByRefStr)] ref string input);
到目前为止,上述都没有奏效.或以上的变化.
在Delphi中,代码看起来像
pTmpBuf : PChar;
iLastErr := PclGetField(fHandle,iField,pTmpBuf);
我怎么能用Delphi代码写这个呢？
[DllImport("FT_ND_API.dll")]
public static extern uint epas_CreateContext(out IntPtr hContextHandle,
uint ulFlags, uint ulApiVersion);
[DllImport("FT_ND_API.dll")]
public static extern uint epas_OpenDevice(IntPtr hContextHandle,
uint ulQueryType, IntPtr pQueryData);
[DllImport("FT_ND_API.dll")]
public static extern uint epas_GetProperty(IntPtr hContextHandle, uint ulFlags,
IntPtr pRefData, byte[] pPropData, uint ulPropSize);
[DllImport("FT_ND_API.dll")]
public static extern uint epas_CreateDir(IntPtr hContextHandle, uint ulFlags,
String pucName, String pucGuid, ref WDirInfo pDirInfo, uint ulSizeOfDirInfo);
我想PInvoke从C#用VB6编写的函数.我们可以在VB6中调用这个函数,如下所示:
Declare Function ApplyNNet Lib " location of the DLL file" (MyNNetType As String, MyAddress As String, MyInput() As Double) As Variant
我在C#中的代码是:
[DllImport("NNetApply.dll", EntryPoint = "ApplyNNet", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr ApplyNNet(string type, string add, double[,] data);
//run ANN with data
string address = @"C:\Users\PNGE-User\Desktop\Faegheh\Project\Neural Network For Pressure Vs q,x,y\P ve x,y,q\P ve x,y,q";
double[,] P = new double[no_data,2];
var P_ = ApplyNNet("Back Prop", address, data);
当我调试我的代码时,出现错误:
尝试读取或写入受保护的内存.这通常表明其他内存已损坏.
我有两个几乎相同代码的例子.我可以从C#中检索一个数据,但我没有为另一个人提供正确的数据.他们来了:
效果很好
C++部分:
__declspec(dllexport) void** enumerateDevices(int *dIsize){
Array<DeviceInfo> dIArray;
Framewoek::enumerateDevices(&dIArray);
*dIsize = dIArray.getSize();
DeviceInfo dP[255];
for (int i = 0; i < dIArray.getSize(); i++)
dP[i] = dIArray[i];
void* p = dP;
return &p;
}
C#部分:
[DllImport("Wrapper.dll")]
static extern IntPtr enumerateDevices(out int devicesSize);
public static DeviceInfo[] EnumerateDevices()
{
int devicesSize;
IntPtr arrayPointer = enumerateDevices(out devicesSize);
IntPtr[] array = new IntPtr[devicesSize];
Marshal.Copy(arrayPointer, array, 0, devicesSize);
DeviceInfo[] arrayObjects = new DeviceInfo[devicesSize];
for (int i = 0; i < devicesSize; i++)
arrayObjects[i] = new …需要帮助将delphi记录转换为C#struct并将此结构传递给C dll:
type Transaction = record
pos_id: array[0..9] of char;
ev_type: array[0..4] of char;
amount: array[0..14] of char;
chip_reader_used: boolean;
internal_magstripereader_used: boolean;
track2data: array[0..99] of char;
card_usage_mode: array[0..4] of char;
receipt_directory: array[0..254] of char;
additional_info: array[0..999] of char;
event_number: array[0..9] of char;
original_filingcode: array[0..19] of char;
transaction_reasoncode: array[0..9] of char;
end;
试过以下但没有工作:
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public unsafe struct Transaction {
public fixed byte pos_id[10];
public fixed byte ev_type[5];
public fixed byte amount[15];
public bool chip_reader_used;
public … IntPtr win = GetActiveWindow();
RECT dimensions;
GetWindowRect(win, out dimensions);
上面的代码似乎返回一个矩形,其尺寸为0.Right和dimensions.Left值.我对winapi的引用如下.
[DllImport("user32.dll", SetLastError=true)]
static extern IntPtr GetActiveWindow();
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
enum GetWindow_Cmd : uint
{
GW_HWNDFIRST = 0,
GW_HWNDLAST = 1,
GW_HWNDNEXT = 2,
GW_HWNDPREV = 3,
GW_OWNER = 4,
GW_CHILD = 5,
GW_ENABLEDPOPUP = 6
}
[DllImport("user32.dll", SetLastError=true))]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int Left; // x position of upper-left corner …有以下C#代码用于加载和卸载C++ DLL.
我只加载DLL一次,但代码必须卸载DLL 2次.在卸载DLL之后,当我再次加载它,并且我调用DLL的导出函数时,我收到以下错误消息:
尝试读取或写入受保护的内存.这通常表明其他内存已损坏.
DLL依赖于其他DLL.
/// //////////////handle of FDD DLL:
System.IntPtr SystemIntPtr_handle_of_DLL=System.IntPtr.Zero;
private void button4_Click(object sender, EventArgs e)
{
try
{
string string_Dependency_path = ".\\DLL_Dependencies\\";
Call_DLL.SetDllDirectory(string_Dependency_path);
SystemIntPtr_handle_of_DLL = Call_DLL.LoadLibrary("DLL.dll");
if (SystemIntPtr_handle_of_DLL == System.IntPtr.Zero) { throw new Exception("DLL did not load"); }
}
catch (Exception Exception_Object) { MessageBox.Show(Exception_Object.Message); }
}
private void button5_Click(object sender, EventArgs e)
{
try
{
int int_FreeLibrary_counter = 0;
while (Call_DLL.FreeLibrary(SystemIntPtr_handle_of_DLL))
{
int_FreeLibrary_counter++;
}
MessageBox.Show("DLL unloaded. You will have to load it again. (Unloaded" + int_FreeLibrary_counter …