又是C++函数转C#的问题

yinrongg 2010-10-11 02:20:52

尝试了好多次都没成功，只好来这里需帮助。
C++函数原型：
int VC_GetPlateCarInfo(unsigned char *pImageDir,char *szPlate,WORD *Top,WORD *Left,WORD *Bottom,WORD *Right, int Type)

函数名：VC_GetPlateCarInfo
参数说明：
(in) pImageDir:识别的图像路径, 数据类型:unsigned char *;
(out) szPlate:识别返回的车牌号码结果,
数据类型:Char *;
(out) iTop,iLeft,iBottom,iRight:返回的车牌的坐标,
数据类型:Word *;
(in) Type :识别的图像类型,4：jpg,99:bmp, 数据类型：int

转成的C#代码：

[DllImport("OutPutDLL.dll", EntryPoint = "VC_InitGetPlate", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]

        public static extern int GetPlateCarInfo(string pImageDir, StringBuilder szPlate, UInt16 Top, UInt16 Left, UInt16 Bottom, UInt16 Right, int Type);

C#函数调用：

 UInt16 top = new UInt16(), left = new UInt16(), bottom = new UInt16(), right = new UInt16();

            StringBuilder strBld=new StringBuilder(255);

            MessageBox.Show(GetPlateCarInfo(filePath, strBld,  top,  left,  bottom,  right, 4).ToString());

C++函数的char * iTop,iLeft,iBottom,iRight因为是out 参数，对应的C#我也使用过ref/out 。但还是出不了正确结果。大家提提高见！

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xszhou1997 2010-12-03

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VC_InitGetPlate有参数吗？

yinrongg 2010-10-11

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[Quote=引用 12 楼 zhouzhangkui 的回复:]
返回值的参数加上ref
其余的按照类型去修改就行了
[/Quote]

周药师 2010-10-11

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返回值的参数加上ref
其余的按照类型去修改就行了

yinrongg 2010-10-11

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char *JpegFileName=new char[255];

                CString mystr;

				mystr.Format(PathName);							

				//识别

				strcpy(JpegFileName,mystr);				



 				char *HPHM=new char[500];

				WORD *Top=new WORD;

				WORD *Left=new WORD;

				WORD *Bottom=new WORD;

 				WORD *Right=new WORD;

		        //WORD *Top,*Left,*Bottom,*Right;//:获得车牌结果坐标

		

				int result =GetPlateCarInfoFUNCTION(JpegFileName,HPHM,Top,Left,Bottom,Right,4);

这是 C++的代码，直接调用C++的函数原型，正常。

yinrongg 2010-10-11

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[Quote=引用 8 楼 qiuxin425 的回复:]
[DllImport("OutPutDLL.dll", EntryPoint = "VC_InitGetPlate", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]

public static int GetPlateCarInfo(string pImageDir, ref String……
[/Quote] 不行。。。

qiuxin425 2010-10-11

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如果这样不行我就不清楚了应该不会出问题的

qiuxin425 2010-10-11

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[DllImport("OutPutDLL.dll", EntryPoint = "VC_InitGetPlate", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]

public static int GetPlateCarInfo(string pImageDir, ref StringBuilder szPlate, ref UInt16 Top, ref UInt16 Left, ref UInt16 Bottom, ref UInt16 Right, int Type);

top = new UInt16(), left = new UInt16(), bottom = new UInt16(), right = new UInt16();
StringBuilder strBld=new StringBuilder(255);
MessageBox.Show(GetPlateCarInfo(filePath,ref strBld, ref top, ref left, ref bottom, ref right, 4).ToString());

yinrongg 2010-10-11