.Net调用非托管代码时候遇到的问题

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小弟手头有一活，底层都是vc开发的，现在用c#来调用
未曾研究过vc，初次调用出错，在线急等解决方案
vc方法签名如下

LPRENGINE_API LPRRESULT __stdcall InitLPREngineParamHelper( LPREngineParam* pParam, int maxPlate, int minPlateW, int maxPlateW,
	int chnRegion, LPRRatioRect recogRegion, int speed, bool bCapture, bool bAdaptiveFP, bool bEnableLowConfid );

其中包含结构体

struct LPREngineParam
{
	int		size;			
	LPRParam	lprParam;		
	LPRRatioRect	recogRegion;	

	LPRRatioLine	line1;
	LPRRatioLine	line2;

	int		maxSkip;		
	float		minValid;
	float		minConfid;

	int		framePercent;			
	bool		bAdaptiveFP;			
	int 		motionDetectionMode;
	bool		bCapture;					
         int		minCaptureDiff;
	LPRRatioRect    preferCapRegion;		
};

我在C#下是这样实现的
定了一结构体如下

public struct LPREngineParam
    {
        public int size;
        public LPRParam lprPrarm;
        public LPRRatioRect recogRegion;
        public LPRRatioLine line1;
        public LPRRatioLine line2;
        public int maxSkip;
        public float minValid;
        public float minConfid;
        public int framePercent;
        public bool bAdapticeFP;
        public int motionDetectionMode;
        public bool bCapture;
        public int minCaptureDiff;
        public LPRRatioRect preferCapRegion;
    }

创建方法申明为

        [DllImport("LPREngine.dll", CharSet = CharSet.Auto)]
        public static extern long InitLPREngineParamHelper(LPREngineParam pParam, 
            int maxplate, int minPlateW, int maxPlateW, int chnRegion, LPRRatioRect recogRegion, 
            int speed, bool bCapture, bool bAdaptiveFP, bool bEnableLowConfid);

出现异常为

对 PInvoke 函数“PCDLLTest!PCDLLTest.Form1::InitLPREngineParamHelper”的调用导致堆栈不对称。原因可能是托管的 PInvoke 签名与非托管的目标签名不匹配。请检查 PInvoke 签名的调用约定和参数与非托管的目标签名是否匹配。

不好意思没分送大家了

[gomoku]

1, In general, LP... is used to describe a pointer, so be careful not to mix them:

    public struct LPREngineParam
    {
        public int size;
        public LPRParam lprPrarm;               // a pointer or a struct?
        public LPRRatioRect recogRegion;        // a pointer or a struct?
        public LPRRatioLine line1;
        public LPRRatioLine line2;
        public int maxSkip;
        public float minValid;
        public float minConfid;
        public int framePercent;
        public bool bAdapticeFP;
        public int motionDetectionMode;
        public bool bCapture;
        public int minCaptureDiff;
        public LPRRatioRect preferCapRegion;
    }

2, another easy change you may try:
[DllImport("LPREngine.dll", CharSet = CharSet.Auto)]
public static extern long InitLPREngineParamHelper(ref LPREngineParam pParam, ...)

According to C++ prototype, the first parameter must be a pointer, but LPREngineParam is a struct value.

[liveinblue]

不好意思
忘记注明了

LPRParam //struct

LPRRatioRect //struct

[liveinblue]

谢了，结贴！