关于C#调用API的理解(汇多考勤机HD4K)

很多时候为了做集成我们别无选择的要用C#来调用C/C++的API,如果你对C#和C/C++数据类型对应关系不是很了解,那么这就是一件很头疼的事情了。

下面来看看具体怎么使用

void* OpenDevice(int nMyAddress, HWND hWnd)

void CloseDevice(void* pDevice)

void SetMyAddress(void* pDevice, int nAddress) 

BOOL ConnectPort(void* pDevice, LPCTSTR lpCommDef)

BOOL IsConnect(void* pDevice)

void SetAddLog(void* pDevice, BOOL bAddLog)

void SetCommKey(void* pDevice, LPCTSTR lpCommKey)

void SetInnerCode (void* pDevice, BOOL bBig5)

BOOL DisConnectPort(void* pDevice)

void SetWaitTime(void* pDevice, DWORD dwWaitTime)

void* StartICDMCommand(void* pDevice, int nAddress, int nCommand, 

void* pParameters = NULL, int nSizeOfParameter = 0)

int GetSizeOfData(void* pCommand)

BOOL GetData(void* pCommand, void* pDataBuffer, int nSize)

int GetCmdResult(void* pCommand)

void EndICDMCommand(void* pCommand)

void RecvEdition(LPTSTR lpEdition)

上面是api接口原函数

如果想要在C#里面使用就要重新定义以为他是非托管类行

[DllImport("DLL4k.dll", ExactSpelling = false, EntryPoint = "OpenDevice")]

public static extern IntPtr OpenDevice(int nMyAddress, IntPtr hwnd);

[DllImport("DLL4k.dll", SetLastError = true, EntryPoint = "CloseDevice")]

public static extern void CloseDevice(IntPtr hwnd);

[DllImport("DLL4k.dll", SetLastError = true)]

public static extern void SetMyAddress(IntPtr hwnd, int nMyAddress);

[DllImport("DLL4k.dll", ExactSpelling = false, EntryPoint = "ConnectPort")]

public static extern bool ConnectPort(IntPtr pDevice, StringBuilder port);  

[DllImport("DLL4k.dll", SetLastError = true, EntryPoint = "IsConnect")]

[return: System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]

public static extern bool IsConnect(IntPtr pDevice);

[DllImport("DLL4k.dll", SetLastError = true, EntryPoint = "SetAddLog")]

public static extern void SetAddLog(IntPtr pDevice, bool isaddlog);

[DllImport("DLL4k.dll", SetLastError = true)]

public static extern void SetCommKey(IntPtr pDevice, string str);

[DllImport("DLL4k.dll", SetLastError = true)]

public static extern void SetInnerCode(IntPtr pDevice, bool isbog5);

[DllImport("DLL4k.dll", SetLastError = true, EntryPoint = "DisConnectPort")]

[return: System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]

public static extern bool DisConnectPort(IntPtr pDevice);

[DllImport("DLL4k.dll", SetLastError = true, EntryPoint = "SetWaitTime")]

public static extern void SetWaitTime(IntPtr pDevice, int dwWaitTime);

[DllImport("DLL4k.dll", ExactSpelling = false, EntryPoint = "StartICDMCommand")]

public static extern IntPtr StartICDMCommand(IntPtr pDevice, int nAddress, int nCommand, IntPtr pParameters, int nSizeOfParameter = 0);

[DllImport("DLL4k.dll", EntryPoint = "GetSizeOfData", SetLastError = true, CharSet = CharSet.Auto)]

public static extern int GetSizeOfData(IntPtr pParameters);

[DllImport("DLL4k.dll", EntryPoint = "GetData", SetLastError = true)]

[return: System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]

public static extern bool GetData(IntPtr pCommand, IntPtr pDataBuffer, int nSize);

[DllImport("DLL4k.dll", SetLastError = true, EntryPoint = "GetCmdResult")]

public static extern int GetCmdResult(IntPtr pCommand);

[DllImport("DLL4k.dll", SetLastError = true, EntryPoint = "EndICDMCommand")]

public static extern void EndICDMCommand(IntPtr pDevice);

[DllImport("DLL4k.dll", SetLastError = true)]

public static extern void RecvEdition(string str);

以上就是c#调用函数一定要是静态的

下面来看看一个列子

public IntPtr hwnd;

StringBuilder sb = new StringBuilder();

public static IntPtr showhwnd = System.Diagnostics.Process.GetCurrentProcess().Handle;

public static IntPtr api = OpenDevice(0, showhwnd);

public IntPtr kk = new IntPtr();

public static int rcount = 0;

以上要是全局变量

最后是下载数据的调用例子

sb.Clear();

sb.AppendFormat("{0}:baud={1},parity=N,data=8,stop=1", cbPort.Text, cbRate.Text);

int count = 0;

if (!IsConnect(api))

{

    bool islink = ConnectPort(api, sb);

    DMSTATUS dmm = new DMSTATUS();

    int sizenewb = Marshal.SizeOf(dmm);

    IntPtr buffernew = Marshal.AllocCoTaskMem(sizenewb);

    int sizenewa = 0;

    try

    {

    //将托管对象拷贝到非托管内存

    SetWaitTime(api, 3000);

    Marshal.StructureToPtr(dmm, buffernew, true);

    SetAddLog(api, true);

        kk = StartICDMCommand(api, 0, (int)CMDWORD.nRecvDMStatus, buffernew, sizenewb);

        rcount = GetCmdResult(kk);

        if (rcount != 0)

        {

            sizenewa = GetSizeOfData(kk);

            bool isok = GetData(kk, buffernew, sizenewa);

            DMSTATUS mm = (DMSTATUS)Marshal.PtrToStructure(buffernew, typeof(DMSTATUS));

            count = mm.nRecordCount;

            EndICDMCommand(kk);

            StringBuilder sbt = new StringBuilder();

            int totalcount = 0;

            if (count % 100 == 0)

            {

            totalcount = count / 100;

            }

            else

            {

               totalcount = (count / 100) + 1;

            }

            for (int i = 0; i < totalcount; i++)

            {

               bool link = ConnectPort(api, sb);

               if (link)

               {

                  ATTGUARDRECORD[] Record = new ATTGUARDRECORD[100];

                  int sizerecord = Marshal.SizeOf(Record[0]);

                  IntPtr bufferrecord = Marshal.AllocCoTaskMem(sizerecord * 100);

                  kk = StartICDMCommand(api, 0, (int)CMDWORD.nRecvDelRecord, bufferrecord, sizerecord);

                  rcount = GetCmdResult(kk);

                  if (rcount > 0)

                  {

                     int sizecount = GetSizeOfData(kk);

                     GetData(kk, bufferrecord, sizecount);

                     for (int j = 0; j < 100; j++)

                     {

                     Record[j] = (ATTGUARDRECORD)Marshal.PtrToStructure((IntPtr)(bufferrecord + sizerecord * j), typeof(ATTGUARDRECORD));

                     if (Record[j].nYear > 0)

                     {

                       sbt.AppendLine(Record[j].strPersonID + "-" +Record[j].nYear.ToString() + "-" + Record[j].nMonth.ToString() + "-" + Record[j].nDay.ToString() + "-"+ Record[j].nHour.ToString() + ":" + Record[j].nMinute.ToString()+ ":" + Record[j].nSecond.ToString()+ "-" +Record[j].bOnDuty.ToString() + "-" + Record[j].bBC.ToString() + "-" + Record[j].nDMAdr);

                                }

                                else

                                {

                                    continue;

                                }

                        }

                        IntPtr del = new IntPtr();

                        StartICDMCommand(api, 0, (int)CMDWORD.nRecvDelRecordRlt, del);

                        }

                    }

                    EndICDMCommand(kk);

            }

            txtcontent.Text = sbt.ToString();

            }

        }

        catch

        {



        }

} 

这样就结束了