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[英]Calling function in C dll from C# which returns somekind of pointer to function pointer
[英]C# calling a DLL function that returns a pointer to pointer to an array of structures
我尝试了各种方法的许多不同组合来编组此调用。 这是一个 DLL,它返回一个指向结构数组指针的指针。 像 debugPort 这样的类型实际上是枚举。
/**
* \struct debugConnectParameters
* \brief Get device characterization and specify connection parameters through ST-LINK interface.
*/
typedef struct debugConnectParameters {
debugPort dbgPort; /**< Select the type of debug interface #debugPort. */
int index; /**< Select one of the debug ports connected. */
char serialNumber[33]; /**< ST-LINK serial number. */
char firmwareVersion[20]; /**< Firmware version. */
char targetVoltage[5]; /**< Operate voltage. */
int accessPortNumber; /**< Number of available access port. */
int accessPort; /**< Select access port controller. */
debugConnectMode connectionMode; /**< Select the debug CONNECT mode #debugConnectMode. */
debugResetMode resetMode; /**< Select the debug RESET mode #debugResetMode. */
int isOldFirmware; /**< Check Old ST-LINK firmware version. */
frequencies freq; /**< Supported frequencies #frequencies. */
int frequency; /**< Select specific frequency. */
int isBridge; /**< Indicates if it's Bridge device or not. */
int shared; /**< Select connection type, if it's shared, use ST-LINK Server. */
} debugConnectParameters;
int getStLinkList(debugConnectParameters** stLinkList, int shared);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public unsafe struct debugConnectParameters
{
debugPort dbgPort; /**< Select the type of debug interface #debugPort. */
int index; /**< Select one of the debug ports connected. */
fixed char serialNumber[33]; /**< ST-LINK serial number. */
fixed char firmwareVersion[20]; /**< Firmware version. */
fixed char targetVoltage[5]; /**< Operate voltage. */
int accessPortNumber; /**< Number of available access port. */
int accessPort; /**< Select access port controller. */
debugConnectMode connectionMode; /**< Select the debug CONNECT mode #debugConnectMode. */
debugResetMode resetMode; /**< Select the debug RESET mode #debugResetMode. */
int isOldFirmware; /**< Check Old ST-LINK firmware version. */
frequencies freq; /**< Supported frequencies #frequencies. */
int frequency; /**< Select specific frequency. */
int isBridge; /**< Indicates if it's Bridge device or not. */
int shared; /**< Select connection type, if it's shared, use ST-LINK Server. */
}
[DllImport(dllPath + "CubeProgrammer_API.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
public unsafe extern static int getStLinkList(
debugConnectParameters** stLinkList,
int shared
);
我尝试使用“out”和“ref”选项替换。 我试图找到它喜欢的 IntPtr 版本。 我不断收到:System.AccessViolationException。 我已经联系 STMicroelectronics 关于如何与这个 DLL 接口,但到目前为止他们没有帮助。 DLL 中的调用 rest 非常简单,但我必须让这个开始工作,因为它是关于实际连接的 JTAG 设备的信息。
更新 (6/12/20) 以添加实际调用 function,现在调用 function 将结构从非托管结构复制到托管结构。 但是对 getStLinkList() 的调用仍然不起作用。
public unsafe static int GetDeviceList(ref debugConnectParameters[] debugParams, int maxCount)
{
IntPtr unManagedListPtr = Marshal.AllocHGlobal(sizeof(debugConnectParameters*));
IntPtr *unManagedListPtrPtr = &unManagedListPtr;
int count = getStLinkList((debugConnectParameters**)unManagedListPtrPtr, 0);
IntPtr copyPtr = unManagedListPtr;
if (count > maxCount) count = maxCount;
for (int i = 0; i < count; i++)
{
debugParams[i] = (debugConnectParameters)Marshal.PtrToStructure(copyPtr, typeof(debugConnectParameters));
copyPtr += sizeof(debugConnectParameters);
}
Marshal.FreeHGlobal(unManagedListPtr);
return (count);
}
我也尝试了这些更改,但没有成功。 我仍然看到访问冲突。 尝试读取或写入受保护的 memory。
[DllImport(dllPath + "CubeProgrammer_API.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
unsafe private static extern int getStLinkList(
ref IntPtr stLinkList,
int shared
);
unsafe public static int GetDeviceList(List<debugConnectParameters> list)
{
IntPtr unManagedListPtr = Marshal.AllocHGlobal(sizeof(debugConnectParameters*));
IntPtr copyPtr = unManagedListPtr;
int count = getStLinkList(ref unManagedListPtr, 0);
if (count > 10) count = 10;
for (int i = 0; i < count; i++)
{
debugConnectParameters parameter = (debugConnectParameters)Marshal.PtrToStructure(copyPtr, typeof(debugConnectParameters));
list.Add(parameter);
copyPtr += sizeof(debugConnectParameters);
}
Marshal.FreeHGlobal(unManagedListPtr);
return (count);
}
特别是在调用“CubeProgrammer_API.dll”库的getStLinkList
function 方面,有两件事对我们不利。 如果不更正它们,库将无法工作,即使是 C++。
首先,在 STM32CubeProgrammer 安装的api/lib文件夹中找到的该库的依赖项并非全部针对 x64 编译。 bin文件夹中的版本是您希望在运行时可用的库。 我通过在项目调试设置中将工作目录设置为该目录来完成此操作。 这是通过检查api/lib和bin文件夹中每个 DLL 的目标机器来验证的。
其次,“CubeProgrammer_API.dll”需要在通过调用setLoadersPath
和setDisplayCallbacks
函数调用getStLinkList
之前进行初始化。 第一个 function 必须提供“Flash Loader”的路径,在我的例子中是bin/FlashLoader 。 setDisplayCallbacks
function 采用三个 function 指针的结构。
下面的示例可能不是类型编组的最佳示例,但它会说明该过程。
public static class CubeProgrammerApi
{
public enum DebugConnectionMode
{
NormalMode = 0,
HotplugMode = 1,
UnderResetMode = 2,
PreResetMode = 3
}
public enum DebugResetMode
{
SoftwareReset = 0,
HardwareReset = 1,
CoreReset = 2
}
[StructLayout(LayoutKind.Sequential)]
public class Frequencies
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
uint[] JtagFrequency;
uint JTagFrequencyNumber;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
uint[] SwdFrequency;
uint SwdFrequencyNumber;
}
[StructLayout(LayoutKind.Sequential)]
public class DebugConnectParameters
{
DebugPort DebugPort;
public int Index;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 33)]
public string SerialNumber;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
public string FirmwareVersion;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 5)]
public string TargetVoltage;
public int AccesPortNumber;
public int AccessPort;
public DebugConnectionMode connectionMode;
public DebugResetMode resetMode;
public bool IsOldFirmware;
public Frequencies Freqencies;
public int Frequency;
public bool IsBridge;
public int Shared;
}
public delegate void LogMessageReceived(int messageType, [MarshalAs(UnmanagedType.LPWStr)] string message);
public delegate void InitProgressBar();
public delegate void ProgressBarUpdateReceived(int currentProgress, int total);
internal static class NativeMethods
{
public struct DisplayCallbacks
{
public InitProgressBar initProgressBar;
public LogMessageReceived logMessage;
public ProgressBarUpdateReceived loadBar;
}
[DllImport("CubeProgrammer_API.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "setLoadersPath")]
internal static extern void SetLoadersPath(string path);
[DllImport("CubeProgrammer_API.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "setDisplayCallbacks")]
internal static extern void SetDisplayCallbacks(ref DisplayCallbacks callbacks);
[DllImport("CubeProgrammer_API.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "getStLinkList")]
internal static extern int GetStLinkList(IntPtr stLinkList, uint shared);
[DllImport("CubeProgrammer_API.dll", CallingConvention = CallingConvention.Cdecl)]
internal static extern void deleteInterfaceList();
[DllImport("CubeProgrammer_API.dll", CallingConvention = CallingConvention.Cdecl, EntryPoint = "reset")]
internal static extern int Reset([MarshalAs(UnmanagedType.U4)] DebugResetMode rstMode);
}
public static void SetLoadersPath(string path)
{
NativeMethods.SetLoadersPath(path);
}
public static void SetDisplayCallbacks(InitProgressBar initProgressBar, LogMessageReceived messageReceived, ProgressBarUpdateReceived progressBarUpdate)
{
NativeMethods.DisplayCallbacks callbacksHandle;
callbacksHandle.initProgressBar = initProgressBar;
callbacksHandle.logMessage = messageReceived;
callbacksHandle.loadBar = progressBarUpdate;
NativeMethods.SetDisplayCallbacks(ref callbacksHandle);
}
public static IList<DebugConnectParameters> GetStLinkProgrammers(bool shared = false)
{
var listPtr = Marshal.AllocHGlobal(Marshal.SizeOf<IntPtr>());
var parametersList = new List<DebugConnectParameters>();
try
{
var size = Marshal.SizeOf<DebugConnectParameters>();
var numberOfItems = NativeMethods.GetStLinkList(listPtr, shared ? 1U : 0U);
var listDereference = Marshal.PtrToStructure<IntPtr>(listPtr);
for (var i = 0; i < numberOfItems; i++)
{
var currentItem = Marshal.PtrToStructure<DebugConnectParameters>(listDereference + (i * size));
parametersList.Add(currentItem);
}
NativeMethods.deleteInterfaceList();
}
finally
{
Marshal.FreeHGlobal(listPtr);
}
return parametersList;
}
public static void FreeStLinkProgrammers()
{
NativeMethods.deleteInterfaceList();
}
}
和主要的:
class Program
{
static void Main(string[] args)
{
CubeProgrammerApi.SetLoadersPath(@"C:\Program Files\STMicroelectronics\STM32Cube\STM32CubeProgrammer\bin\FlashLoader");
CubeProgrammerApi.SetDisplayCallbacks(InitProgressBar, ReceiveMessage, ProgressBarUpdate);
var stLinkList = CubeProgrammerApi.GetStLinkProgrammers();
foreach (var stlink in stLinkList)
{
Console.WriteLine("{0} {1}", stlink.Index, stlink.SerialNumber);
}
Console.WriteLine("Press ENTER to exit");
Console.ReadLine();
CubeProgrammerApi.FreeStLinkProgrammers();
}
static void ReceiveMessage(int messgaeType, string message)
{
}
static void InitProgressBar()
{
}
static void ProgressBarUpdate(int currentProgress, int total)
{
}
}
这将 output 连接两个调试器,分别是一个 STLink V3 和一个 STLink V2。 这应该让您走得足够远,可以发现要使用的正确类型。
0 002F001D3038511834333935
1 34FF6D065250343847110943
Press ENTER to exit
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