c# invoking c++ dll,this is c++ header file,how to program c# code

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C#

typedef struct tagGOODSDATA {
       wchar_t        szGoodsName [128];        //1.物品名称
       wchar_t        szGoodsUnit [32];         //2.物品单位
       char           szGoodsNum[24];           //3.物品数量
}GOODSDATA, *PGOODSDATA;

C#

typedef struct tagINVOICEEXTDATA {
       wchar_t         szFpBuyerName[128];          //1.购方企业名称
       wchar_t         szFpSellerName[128];         //2.销方企业名称
       char            szGoodsRows[4];                      //3.物品行数
       GOODSDATA       szGoodsData[8];              //4.物品信息数组
}INVOICEEXTDATA, *PINVOICEEXTDATA;

C#

typedef struct tagINVOICEDATA {
    char    szFpImage[258];             //  发票扫描图像文件名
    char    szFpCode[20];               //1:发票代码(10字节)
    char    szFpSeriaoNo[20];           //3:发票印刷序号(8字节)
    char    szFpCode1[20];
    char    szFpSeriaoNo1[20];          //3:发票印刷序号(8字节)
    char    szFpEnVersion[10];          //  加密版本号(2字节) ???
    char    szFpDate[20];               //2:发票开票日期(6字节)
    char    szFpTaxRate[10];            //8:税率 !!!
    char    szFpBuyerTaxNo[30];         //4:购方纳税号(15/17/18/20字节)
    char    szFpSellerTaxNo[30];        //7:销方纳税号(15/17/20字节)
    char    szFpTotal[40];              //  价税合计
    char    szFpSum[40];                //5:金额
    char    szFpTax[40];                //6:税额 !!!
    char    szFpCryptograph[1024];      //0:密文数据(84/108/780字节)
}INVOICEDATA, *PINVOICEDATA;

int WINAPI FpGetVersion(int nCompanyCode, int nScannerType);
int WINAPI FpScannerInitialize(void);
int WINAPI FpScannerTerminate(int wAction);
int WINAPI FpGetNewPage(PINVOICEDATA lpFpBuffer, PINVOICEEXTDATA lpFpExtBuffer, int *isBarCode);

Posted 26-Apr-12 23:18pm

chaozhiqiang

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Sandeep Mewara 27-Apr-12 5:50am

Not clear.

2 solutions

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«_Superman_» · Answer 1 · 2012-04-27T00:34:00

Solution 1

The keyword here is DllImport
Check this out - http://msdn.microsoft.com/en-us/library/aa288468(v=vs.71).aspx[^]

Posted 27-Apr-12 0:34am

«_Superman_»

chaozhiqiang · Answer 2 · 2012-04-27T00:36:00

C#

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode,Pack=1)]
        public struct tagGoodNameUnit
        {
            //物品名称
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string szGoodsName;
            //物品单位
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string szGoodsUnit;
        }

C#

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode,Pack=1)]
        public struct tagFpBuyerSellerName
        {
            //购方企业名称
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string szFpBuyerName;
            //销方企业名称
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string szFpSellerName;
        }

C#

[StructLayout(LayoutKind.Sequential,Pack=1)]
        public struct TagGOODSDATA
        {
            [MarshalAs(UnmanagedType.Struct)]
            public tagGoodNameUnit szGoodsNameUnit;
            //物品数量
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 24)]
            public string szGoodsNum;
        }

SQL

[StructLayout(LayoutKind.Sequential,Pack=1)]
        public struct TagINVOICEEXTDATA
        {
            [MarshalAs(UnmanagedType.Struct)]
            public tagFpBuyerSellerName szFpBuyerSellerName;
            //物品行数
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
            public string szGoodsRows;
            //物品信息数组
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
            public TagGOODSDATA[] szGoodsData;
        }

VB

[StructLayout(LayoutKind.Sequential)]
        public struct TagINVOICEDATA
        {
            //发票扫描图像文件名
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 258)]
            public string szFpImage;
            //发票代码(10字节)
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
            public string szFpCode;
            //发票印刷序号(8字节)
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
            public string szFpSeriaoNo;
            //
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
            public string szFpCode1;
            //
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
            public string szFpSeriaoNo1;
            //加密版本号(2字节)
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string szFpEnVersion;
            //开票日期
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
            public string szFpDate;
            //税率
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string szFpTaxRate;
            //购方纳税号
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
            public string szFpBuyerTaxNo;
            //销方纳税号
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
            public string szFpSellerTaxNo;
            //价税合计
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)]
            public string szFpTotal;
            //金额
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)]
            public string szFpSum;
            //税额
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)]
            public string szFpTax;
            //密文数据
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 1024)]
            public string szFpCryptograph;
        }

C#

[DllImport("scanreco.dll", ExactSpelling = true)]
        public static extern int FpGetNewPage(ref TagINVOICEDATA lpFpBuffer, ref TagINVOICEEXTDATA lpFpExtBuffer, ref int isBarCode);

C#

[DllImport("scanreco.dll", ExactSpelling = true)]
        public static extern int FpGetVersion(int nCompanyCode, int nScannerType);

C#

[DllImport("scanreco.dll", ExactSpelling = true)]
        public static extern int FpScannerInitialize();

C#

[DllImport("scanreco.dll", ExactSpelling = true)]
        public static extern int FpScannerTerminate(int wAction);

TagINVOICEDATA tag = new TagINVOICEDATA();
TagINVOICEEXTDATA tagExt = new TagINVOICEEXTDATA();
int iIsTwoWM = 0;

int iVersion = FpGetVersion(26494179, 51);
int iInitialize = FpScannerInitialize();
int result = FpGetNewPage(ref tag, ref tagExt, ref iIsTwoWM);
int iResult = FpScannerTerminate(0);

this is the c# code,but the struct info is wrong,because of chinese character,i use unicode,but the goods info is wrong