C++Builder XE6开发海康设备控制软件--摄像头图像预览与云台控制

C++Builder XE6开发海康设备控制软件，控制摄像头图像预览与云台控制，写了两遍都发布失败了，只好直接上代码了，注意XE6的wchar_t问题，因为海康dll是vc写的，只支持char，需要转换，特别是“.c_str()”函数的使用，程序中使用AnsiString定义字符串，使用String会出错。

Main.cpp代码：

//---------------------------------------------------------------------------

#include 
#pragma hdrstop

#include "Main.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TfrmMain *frmMain;
//---------------------------------------------------------------------------
__fastcall TfrmMain::TfrmMain(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::FormCreate(TObject *Sender)
{
    Dir = ExtractFilePath(Application->ExeName) ;
    iLastErr = 0 ;
    m_lUserID = -1 ;
    m_lRealHandle = -1 ;
	m_bInitSDK = false ;
    m_bRecord = false ;
    bAuto = false ;
	CreateDirectory(String(Dir + "SdkLog").c_str(),NULL); //创建日志目录
	CreateDirectory(String(Dir + "CapPic").c_str(),NULL); //创建抓图目录
	CreateDirectory(String(Dir + "Record").c_str(),NULL); //创建录像目录
	m_bInitSDK = NET_DVR_Init() ;
	if (m_bInitSDK)
		NET_DVR_SetLogToFile(3, AnsiString(Dir+ "SdkLog\\").c_str(), true) ;   //保存SDK日志
	else
        ShowMessage("NET_DVR_Init初始化失败!") ;
}
//---------------------------------------------------------------------------
void __fastcall TfrmMain::FormDestroy(TObject *Sender)
{
    if(m_lRealHandle >= 0)
        NET_DVR_StopRealPlay(m_lRealHandle);
    if(m_lUserID >= 0)
        NET_DVR_Logout(m_lUserID);
    if(m_bInitSDK)
        NET_DVR_Cleanup();
}
//---------------------------------------------------------------------------
//登录
void __fastcall TfrmMain::btnLoginClick(TObject *Sender)
{
	if (edtIPAddress->Text==""||edtPortNumber->Text==""
	  ||edtUserName->Text==""||edtPassword->Text=="")
	{
		ShowMessage("请输入设备地址、端口、用户名和密码！") ;
		return ;
	}
	DVRIPAddress = edtIPAddress->Text ; 			//设备IP地址或者域名
	DVRPortNumber = edtPortNumber->Text.ToInt() ;	//设备服务端口号
	DVRUserName = edtUserName->Text ;				//设备登录用户名
	DVRPassword = edtPassword->Text ;				//设备登录密码
    NET_DVR_DEVICEINFO_V30 DeviceInfo ;
	if (m_lUserID < 0)
	{
		//登录设备
		m_lUserID = NET_DVR_Login_V30(DVRIPAddress.c_str(), DVRPortNumber, DVRUserName.c_str(), DVRPassword.c_str(), &DeviceInfo) ;
		if (m_lUserID < 0)
		{
			iLastErr = NET_DVR_GetLastError() ;
			//登录失败，输出错误号
			ShowMessage("NET_DVR_Login_V30登录失败，错误代码" + String(iLastErr)) ;
		}
		else
		{
			//登录成功
			ShowMessage(DVRIPAddress+"登录成功") ;
			btnLogin->Caption = "注销" ;
		}
	}
	else
	{
		//注销登录
		if (m_lRealHandle >= 0)
		{
			ShowMessage("请首先停止在线预览！") ;
			return ;
		}
		if (!NET_DVR_Logout(m_lUserID))
		{
			iLastErr = NET_DVR_GetLastError() ;
			ShowMessage("NET_DVR_Logout注销失败，错误代码" + String(iLastErr)) ;
		}
        else
            ShowMessage(DVRIPAddress+"注销成功") ;
		m_lUserID = -1 ;
		btnLogin->Caption = "登录" ;
	}   
}
//---------------------------------------------------------------------------
//预览
void __fastcall TfrmMain::btnPreviewClick(TObject *Sender)
{
    if(m_lUserID < 0)
    {
        ShowMessage("请首先登录设备") ;
        return ;
    }
    NET_DVR_PREVIEWINFO lpPreviewInfo ;
    lpPreviewInfo.hPlayWnd = pnlPreview->Handle ;       //预览窗口
    lpPreviewInfo.lChannel = edtChannel->Text.ToInt() ; //预te览的设备通道
    lpPreviewInfo.dwStreamType = 0 ;                    //码流类型：0-主码流，1-子码流，2-码流3，3-码流4，以此类推
    lpPreviewInfo.dwLinkMode = 0 ;                      //连接方式：0- TCP方式，1- UDP方式，2- 多播方式，3- RTP方式，4-RTP/RTSP，5-RSTP/HTTP
    lpPreviewInfo.bBlocked = true ;                     //0- 非阻塞取流，1- 阻塞取流
    lpPreviewInfo.dwDisplayBufNum = 15 ;                //播放库播放缓冲区最大缓冲帧数
    
    if (m_lRealHandle < 0)
    {
        REALDATACALLBACK RealData ;//预览实时流回调函数
        void* pUser = 0 ;//用户数据

        //打开预览
		m_lRealHandle = NET_DVR_RealPlay_V40(m_lUserID, &lpPreviewInfo, NULL, pUser) ;
        if (m_lRealHandle < 0)
        {
            iLastErr = NET_DVR_GetLastError();
            //预览失败，输出错误号
            ShowMessage("NET_DVR_RealPlay_V40预览失败，错误代码" + String(iLastErr)) ;
            return;
        }
        else
		{
            //预览成功
			btnPreview->Caption = "停止预览" ;
			ShowMessage("预览成功") ;
		}
    }
    else
    {
        //停止预览
        if (!NET_DVR_StopRealPlay(m_lRealHandle))
        {
            iLastErr = NET_DVR_GetLastError() ;
            //停止预览失败，输出错误号
            ShowMessage("NET_DVR_StopRealPlay停止预览失败，错误代码" + String(iLastErr)) ;
		}
		else
		{
			//pnlPreview->Assign(NULL) ;
			//pnlPreview->Color = clBlack ; //  pnlPreview->Free() ;// Update() ;
			ShowMessage("停止预览成功") ;
		}
        m_lRealHandle = -1 ;
        btnPreview->Caption = "预览" ;
    }
	if(m_lRealHandle > -1)
        chkPreview->Checked = true ;
    else
        chkPreview->Checked = false ;
}
//---------------------------------------------------------------------------
//BMP抓图
void __fastcall TfrmMain::btnBMPClick(TObject *Sender)
{
    //图片保存路径和文件名
    String sBmpPicFileName = "BMP" + Now().FormatString("yyyymmddhhnnss") + ".bmp" ;
    //BMP抓图
    if (!NET_DVR_CapturePicture(m_lRealHandle, (Dir + "CapPic\\" + sBmpPicFileName).c_str()))
    {
        iLastErr = NET_DVR_GetLastError();
        ShowMessage("NET_DVR_CapturePicture BMP抓图失败，错误代码" + String(iLastErr)) ;
    }
    else
    {
        ShowMessage("BMP抓图成功，文件保存为" + sBmpPicFileName) ;
    }
}
//---------------------------------------------------------------------------
//JPEG抓图
void __fastcall TfrmMain::btnJPEGClick(TObject *Sender)
{
    //图片保存路径和文件名
    String sJpegPicFileName = "JPEG" + Now().FormatString("yyyymmddhhnnss") + ".jpg" ;
    int lChannel = edtChannel->Text.ToInt() ; //通道号

    NET_DVR_JPEGPARA lpJpegPara ;
    lpJpegPara.wPicQuality = 0 ; //图像质量
    lpJpegPara.wPicSize = 0xff ; //抓图分辨率2- 4CIF，0xff- Auto(使用当前码流分辨率)，抓图分辨率需要设备支持，更多取值请参考SDK文档

    //JPEG抓图
    if (!NET_DVR_CaptureJPEGPicture(m_lUserID, lChannel, &lpJpegPara, (Dir + "CapPic\\" + sJpegPicFileName).c_str()))
    {
        iLastErr = NET_DVR_GetLastError();
        ShowMessage("NET_DVR_CaptureJPEGPicture JPEG抓图失败，错误代码" + String(iLastErr)) ;
    }
    else
    {
        ShowMessage("JPEG抓图成功，文件保存为" + sJpegPicFileName) ;
    }
}
//---------------------------------------------------------------------------
//客户端录像
void __fastcall TfrmMain::btnRecordClick(TObject *Sender)
{
    //录像保存路径和文件名 the path and file name to save
    String sVideoFileName = "Record" + Now().FormatString("yyyymmddhhnnss") + ".mp4" ;
    if (m_bRecord == false)
    {
        //强制I帧
		m_lChannel = edtChannel->Text.ToInt() ; //通道号
		NET_DVR_MakeKeyFrame(m_lUserID, m_lChannel) ;

		//开始录像
        if (!NET_DVR_SaveRealData(m_lRealHandle, (Dir + "Record\\" + sVideoFileName).c_str()))
        {
            iLastErr = NET_DVR_GetLastError();
            ShowMessage("NET_DVR_SaveRealData 录像失败，错误代码" + String(iLastErr)) ;
        }
        else
        {                  
            btnRecord->Caption = "客户端录像停止" ;
            m_bRecord = true ;
        }
    }
    else
    {
        //停止录像
        if (!NET_DVR_StopSaveRealData(m_lRealHandle))
        {
            iLastErr = NET_DVR_GetLastError();
            ShowMessage("NET_DVR_StopSaveRealData 停止录像失败，错误代码" + String(iLastErr)) ;
        }
        else
        {
            ShowMessage("客户端录像停止，文件保存为" + sVideoFileName) ;
            btnRecord->Caption = "客户端录像" ;
            m_bRecord = false;
        }            
    }
}
//---------------------------------------------------------------------------
//摄像机云台-转动
void __fastcall TfrmMain::btnPTZMouseDown(TObject *Sender,
      TMouseButton Button, TShiftState Shift, int X, int Y)
{
    TComponent *cpt = dynamic_cast(Sender) ;
	if(cpt == 0 || cpt->Tag < 0 || cpt->Tag > 10 )
		return ;
	DWORD dwPTZCommand[11] = {PAN_AUTO,TILT_UP,TILT_DOWN,PAN_LEFT,PAN_RIGHT,ZOOM_IN,ZOOM_OUT,FOCUS_NEAR,FOCUS_FAR,IRIS_OPEN,IRIS_CLOSE} ;
	if(cpt->Tag == 0)
	{
    	if (chkPreview->Checked)
		{
			if (!bAuto)
			{
				NET_DVR_PTZControlWithSpeed(m_lRealHandle, PAN_AUTO, 0, cbbSpeed->ItemIndex + 1) ;
				bAuto = true;
			}
			else
			{
				NET_DVR_PTZControlWithSpeed(m_lRealHandle, PAN_AUTO, 1, cbbSpeed->ItemIndex + 1) ;
				bAuto = false;
			}
		}
		else
		{
			if (!bAuto)
			{
				NET_DVR_PTZControlWithSpeed_Other(m_lUserID, m_lChannel, PAN_AUTO, 0, cbbSpeed->ItemIndex + 1) ;
				bAuto = true;
			}
			else
			{
				NET_DVR_PTZControlWithSpeed_Other(m_lUserID, m_lChannel, PAN_AUTO, 1, cbbSpeed->ItemIndex + 1) ;
				bAuto = false;
			}
		}
	}
	else
	{
		if(chkPreview->Checked)
			NET_DVR_PTZControlWithSpeed(m_lRealHandle,dwPTZCommand[cpt->Tag],0,cbbSpeed->ItemIndex+1) ;
		else
			NET_DVR_PTZControlWithSpeed_Other(m_lUserID,m_lChannel,dwPTZCommand[cpt->Tag],0,cbbSpeed->ItemIndex+1) ;
	}
}
//---------------------------------------------------------------------------
//摄像机云台-停止
void __fastcall TfrmMain::btnPTZMouseUp(TObject *Sender,
	  TMouseButton Button, TShiftState Shift, int X, int Y)
{
	TComponent *cpt = dynamic_cast(Sender) ;
	if(cpt == 0 || cpt->Tag < 0 || cpt->Tag > 10 )
		return ;
	DWORD dwPTZCommand[11] = {PAN_AUTO,TILT_UP,TILT_DOWN,PAN_LEFT,PAN_RIGHT,ZOOM_IN,ZOOM_OUT,FOCUS_NEAR,FOCUS_FAR,IRIS_OPEN,IRIS_CLOSE} ;
	if(chkPreview->Checked)
		NET_DVR_PTZControlWithSpeed(m_lRealHandle,dwPTZCommand[cpt->Tag],1,cbbSpeed->ItemIndex+1) ;
	else
		NET_DVR_PTZControlWithSpeed_Other(m_lUserID,m_lChannel,dwPTZCommand[cpt->Tag],1,cbbSpeed->ItemIndex+1) ;
}
//---------------------------------------------------------------------------

Main.h代码：

//---------------------------------------------------------------------------

#ifndef MainH
#define MainH
//---------------------------------------------------------------------------
#include "HCNetSDK.h"
#include "PreviewDemoPCH.h"
#include 
#include 
#include 
#include 
#include 
#include 
//---------------------------------------------------------------------------
class TfrmMain : public TForm
{
__published:	// IDE-managed Components
	TPanel *pnlPreview;
	TLabel *lblIP;
	TEdit *edtIPAddress;
	TEdit *edtPortNumber;
	TLabel *lblPort;
	TEdit *edtUserName;
	TLabel *lblUser;
	TEdit *edtPassword;
	TLabel *lblPsw;
	TButton *btnLogin;
	TButton *btnPreview;
	TLabel *lblChannel;
	TEdit *edtChannel;
    TButton *btnBMP;
    TButton *btnJPEG;
    TButton *btnRecord;
    TSpeedButton *btnPTZUp;
    TSpeedButton *btnPTZLeft;
    TSpeedButton *btnPTZHome;
    TSpeedButton *btnPTZRight;
    TSpeedButton *btnPTZDown;
    TCheckBox *chkPreview;
	TLabel *lblSpeed;
    TComboBox *cbbSpeed;
	TSpeedButton *btnZoomAdd;
	TSpeedButton *btnFocusAdd;
	TSpeedButton *btnBrightAdd;
	TSpeedButton *btnBrightDec;
	TSpeedButton *btnFocusDec;
	TSpeedButton *btnZoomDec;
	TLabel *lblZoom;
	TLabel *lblFocus;
	TLabel *lblBright;
	void __fastcall FormCreate(TObject *Sender);
    void __fastcall FormDestroy(TObject *Sender);
	void __fastcall btnLoginClick(TObject *Sender);
    void __fastcall btnPreviewClick(TObject *Sender);
    void __fastcall btnBMPClick(TObject *Sender);
    void __fastcall btnJPEGClick(TObject *Sender);
    void __fastcall btnRecordClick(TObject *Sender);
    void __fastcall btnPTZMouseDown(TObject *Sender, TMouseButton Button,
          TShiftState Shift, int X, int Y);
    void __fastcall btnPTZMouseUp(TObject *Sender, TMouseButton Button,
          TShiftState Shift, int X, int Y);
private:	// User declarations
public:		// User declarations
	__fastcall TfrmMain(TComponent* Owner);
	unsigned int iLastErr;
	int m_lUserID,m_lRealHandle,m_lChannel,DVRPortNumber ;
	bool m_bInitSDK,m_bRecord,bAuto;
	AnsiString Dir,DVRIPAddress,DVRUserName,DVRPassword;
};
//---------------------------------------------------------------------------
extern PACKAGE TfrmMain *frmMain;
//---------------------------------------------------------------------------
#endif