Question

我有一个名为MT7Trace.dll的库和它的标题MT7Trace.h。我希望能够在c＃代码中使用此dll中包含的函数，但我无法正确导入它们。以这两个函数为例：

MT7TRACE MT7TraceEnum MT7TraceCreateEnum (void);
MT7TRACE MT7TraceSensor MT7TraceGetNextSensor (MT7TraceEnum hEnumerator);

其中：

typedef struct tagMT7TraceEnum * MT7TraceEnum;

到目前为止我的天真尝试如下：

[DllImport("MT7Trace.dll")]
public static extern IntPtr MT7TraceCreateEnum(); //MT7TRACE MT7TraceEnum T7TraceCreateEnum (void);

[DllImport("MT7Trace.dll")]
public static extern IntPtr MT7TraceGetNextSensor (IntPtr hEnumerator);//MT7TRACE MT7TraceSensor MT7TraceGetNextSensor (MT7TraceEnum hEnumerator);

但是在测试这个导入的函数时：

private bool InitializeOneSensor()
{
    var hEnum = MT7TraceCreateEnum();

    var sensorCtr  = 0;
    MT7TraceSensor hSensor;
    while ((hSensor = MT7TraceGetNextSensor(hEnum)) != IntPtr.Zero)
    {
        // Do something else ..
        DllTraceReleaseSensor(hSensor);
        sensorCtr++;
    }
    DllTraceReleaseEnum(hEnum);
    return sensorCtr ==1;
}

，其中

using MT7TraceEnum    = System.IntPtr;
using MT7TraceSensor  = System.IntPtr;

我有一个例外：

调用PInvoke函数 'Atracsys.Framework！Atracsys.MicroTouchDevice :: MT7TraceGetNextSensor' 堆栈不平衡。这可能是因为托管PInvoke 签名与非托管目标签名不匹配。检查一下调用约定和PInvoke签名匹配的参数目标非托管签名。

我已经看到一些例子解释了如何创建/重新创建一个结构来用它来调用一个dll函数，但是那些c struct定义在某个地方可用：

struct XXX{
   type1 fiel1;
   type1 fiel1;
   ...

};

因此，为了调用dll函数，创建了一个等效的c sharp结构并用它来调用它。

在我的情况下，我没有结构定义（你可以看到下面的MT7Trace.h）

有什么建议吗？

这是MT7Trace.h代码的内容：

/*******************************************************************************
Copyright 2009 3M. All rights reserved.

Program Name:  MT7Trace
Module Name:   MT7Trace.h

Summary: Application interface for MT 7 Software Trace library

Description:
   This header file defines the application interface for the MT 7 Software
   Trace library. This interface allows an application to enumerate touch
   sensors and obtain traces from the sensors.

Notes:

*******************************************************************************/

#ifndef __MT7TRACE_H__
#define __MT7TRACE_H__

#ifdef __cplusplus
extern "C"
{
#endif

/******************************************************************************/
/* I N C L U D E   F I L E S                                                  */

/* Global Includes */

/* Project Includes */

/* Local Includes */

/******************************************************************************/
/* C O N S T A N T S                                                          */

#ifndef MT7TRACE
#if defined (WIN32) || defined (UNDER_CE)
#define MT7TRACE __declspec (dllimport)
#else
#define MT7TRACE
#endif
#endif


/******************************************************************************/
/* G L O B A L   D A T A   T Y P E S                                          */

typedef enum
{
   MT7TraceReason_Arrival = 1,
   MT7TraceReason_Departure = 2,
   MT7TraceReason_NewTrace = 3,
   MT7TraceReason_NewEvent = 4,
} MT7TraceReason;
typedef void (* MT7TraceCallback) (MT7TraceReason eReason, void * hItem,
                                   void * pvUserCode);
typedef enum
{
   MT7TraceEvent_Touchdown = 0,
   MT7TraceEvent_Drag = 1,
   MT7TraceEvent_Liftoff = 2,
} MT7TraceEventType;
typedef struct tagMT7TraceEnum * MT7TraceEnum;
typedef struct tagMT7TraceSensor * MT7TraceSensor;
typedef struct tagMT7TraceTrace * MT7TraceTrace;
typedef struct tagMT7TraceEvent * MT7TraceEvent;

/******************************************************************************/
/* P U B L I C   D A T A                                                      */


/******************************************************************************/
/* G L O B A L   D A T A                                                      */


/******************************************************************************/
/* G L O B A L   F U N C T I O N   P R O T O T Y P E S                        */


// Enumeration API
MT7TRACE MT7TraceEnum   MT7TraceCreateEnum      (void);
MT7TRACE unsigned int   MT7TraceGetEnumID       (MT7TraceEnum hEnumerator);
MT7TRACE MT7TraceEnum   MT7TraceCloneEnum       (MT7TraceEnum hEnumerator);
MT7TRACE MT7TraceSensor MT7TraceGetNextSensor   (MT7TraceEnum hEnumerator);
MT7TRACE void           MT7TraceReleaseEnum     (MT7TraceEnum hEnumerator);

// Sensor API
MT7TRACE unsigned int   MT7TraceGetSensorID         (MT7TraceSensor hSensor);
MT7TRACE const char *   MT7TraceGetSensorName       (MT7TraceSensor hSensor);
MT7TRACE MT7TraceSensor MT7TraceCloneSensor         (MT7TraceSensor hSensor);
MT7TRACE MT7TraceTrace  MT7TraceGetNextTrace        (MT7TraceSensor hSensor);
MT7TRACE void           MT7TraceSetSensorCallback   (MT7TraceSensor hSensor,MT7TraceCallback fnCallback,void * pvUserCode);
MT7TRACE void           MT7TraceReleaseSensor       (MT7TraceSensor hSensor);

// Trace API
MT7TRACE unsigned int   MT7TraceGetTraceID          (MT7TraceTrace hTrace);
MT7TRACE MT7TraceTrace  MT7TraceCloneTrace          (MT7TraceTrace hTrace);
MT7TRACE MT7TraceEvent  MT7TraceGetNextEvent        (MT7TraceTrace hTrace);
MT7TRACE MT7TraceEvent  MT7TraceGetPriorEvent       (MT7TraceTrace hTrace,unsigned int nOffset);
MT7TRACE void           MT7TraceSetNextEvent        (MT7TraceTrace hTrace,unsigned int nIndex);
MT7TRACE unsigned int   MT7TraceGetEventCount       (MT7TraceTrace hTrace);
MT7TRACE MT7TraceEvent  MT7TraceGetEvent            (MT7TraceTrace hTrace,unsigned int nIndex);
MT7TRACE MT7TraceSensor MT7TraceGetTraceSensor      (MT7TraceTrace hTrace);
MT7TRACE void           MT7TraceSetTraceCallback    (MT7TraceTrace hTrace,MT7TraceCallback fnCallback,void * pvUserCode);
MT7TRACE void           MT7TraceReleaseTrace        (MT7TraceTrace hTrace);

// Event API
MT7TRACE unsigned int       MT7TraceGetEventID      (MT7TraceEvent hEvent);
MT7TRACE MT7TraceEvent      MT7TraceCloneEvent      (MT7TraceEvent hEvent);
MT7TRACE MT7TraceEventType  MT7TraceGetEventType    (MT7TraceEvent hEvent);
MT7TRACE float              MT7TraceGetEventX       (MT7TraceEvent hEvent);
MT7TRACE float              MT7TraceGetEventY       (MT7TraceEvent hEvent);
MT7TRACE unsigned int       MT7TraceGetEventTime    (MT7TraceEvent hEvent);
MT7TRACE MT7TraceTrace      MT7TraceGetEventTrace   (MT7TraceEvent hEvent);
MT7TRACE void               MT7TraceReleaseEvent    (MT7TraceEvent hEvent);

// Monitor/Poll API
MT7TRACE int    MT7TracePoll                (void);
MT7TRACE int    MT7TraceStartMonitor        (void);
MT7TRACE void   MT7TraceStopMonitor         (void);
MT7TRACE void   MT7TraceSetArrivalCallback  (MT7TraceCallback fnCallback,void * pvUserCode);
MT7TRACE void   MT7TraceSetUniversalCallback(MT7TraceCallback fnCallback,void * pvUserCode);

/******************************************************************************/
/* G L O B A L   M A C R O S                                                  */

#ifdef __cplusplus
}
#endif

#endif /* ifndef __MT7TRACE_H__ */

Answer 1

很可能是不平衡堆栈是由使用错误的调用约定引起的。更改您的DllImport属性：

[DllImport("MT7Trace.dll", CallingConvention=CallingConvention.Cdecl)]

C＃调用返回类型为struct *的c dll函数（我没有struct c代码/定义）

1 个答案: