发一段开启摄像头的代码

原文:http://www.donews.net/zwell/archive/2004/09/24/108219.aspx

//---------------------------------------------------------------------------
// author: ZwelL
// http://www.donews.net/zwell/
//---------------------------------------------------------------------------

#pragma hdrstop

#include "Unit1.h"
#include "vfw.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
HWND hWndC;
CAPDRIVERCAPS CapDrvCaps;
CAPSTATUS CapStatus;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormShow(TObject *Sender)
{
char szDeviceName[80];
char szDeviceVersion[80];

for (int wIndex = 0; wIndex < 10; wIndex++)
{
if (capGetDriverDescription (wIndex, szDeviceName,
sizeof (szDeviceName), szDeviceVersion,
sizeof (szDeviceVersion)))
{
ComboBox1->Items->Add(szDeviceName);
}
}

if(ComboBox1->Items->Count>0)
ComboBox1->ItemIndex=0;
else
{
ShowMessage("没有找到视频软件");
Close();
}
Button1Click(NULL);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
hWndC = capCreateCaptureWindow (
(LPSTR) "My Capture Window", // window name if pop-up
WS_CHILD | WS_VISIBLE, // window style
0, 0, 160, 120, // window position and dimensions
(HWND)Panel2->Handle,//(HWND)Application->Handle,//(HWND) hwndParent,
ComboBox1->ItemIndex+1);//(int) nID /* child ID */);

//连接设备：
capDriverConnect(hWndC,0);
capPreviewRate(hWndC, 50); // rate, in milliseconds
capPreview(hWndC, TRUE); // starts preview

//获取视频驱动相关性能
capDriverGetCaps(hWndC, &CapDrvCaps, sizeof (CAPDRIVERCAPS));

//获取捕获窗口状态
capGetStatus(hWndC, &CapStatus, sizeof (CAPSTATUS));
SetWindowPos(hWndC, NULL,
0,
0,
CapStatus.uiImageWidth,
CapStatus.uiImageHeight, SWP_NOZORDER | SWP_NOMOVE);
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{
if(hWndC)
{
capPreview(hWndC, FALSE); // starts preview
capDriverDisconnect (hWndC);
}
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)
{
// Video format dialog box.
if (CapDrvCaps.fHasDlgVideoFormat)
{
capDlgVideoFormat(hWndC);
// Are there new image dimensions?
capGetStatus(hWndC, &CapStatus, sizeof (CAPSTATUS));
SetWindowPos(hWndC, NULL,
0,
0,
CapStatus.uiImageWidth,
CapStatus.uiImageHeight, SWP_NOZORDER | SWP_NOMOVE);
}
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button3Click(TObject *Sender)
{
// Video source dialog box.
if (CapDrvCaps.fHasDlgVideoSource)
capDlgVideoSource(hWndC);
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button4Click(TObject *Sender)
{
//设置相关参数
CAPTUREPARMS CaptureParms;
float FramesPerSec = 30.0;

capCaptureGetSetup(hWndC, &CaptureParms, sizeof(CAPTUREPARMS));

CaptureParms.dwRequestMicroSecPerFrame = (DWORD) (1.0e6 /
FramesPerSec);
capCaptureSetSetup(hWndC, &CaptureParms, sizeof (CAPTUREPARMS));
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button5Click(TObject *Sender)
{
//设置预览时的比例
capPreviewScale(hWndC, 1);
//设置预览时的帧频率
capPreviewRate(hWndC,66);
//如果要捕获视频流，则要使用函数指定不生成文件。否则将会自动生成***I文件
capCaptureSequenceNoFile(hWndC);
//指定是否使用叠加模式，使用为1，否则为0
capOverlay(hWndC, 1);

//Video display dialog box.
if (CapDrvCaps.fHasDlgVideoDisplay)
capDlgVideoDisplay(hWndC);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button6Click(TObject *Sender)
{
if(SaveDialog2->Execute())
capFileSaveDIB( hWndC, (SaveDialog2->FileName+".bmp").c_str() ); //截取当前帧
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button7Click(TObject *Sender)
{
if(Button7->Caption == "开始捕获")
{
if(SaveDialog1->Execute())
{
// Set up the capture operation.
capCaptureSequence(hWndC);
// Capture.
capFileSaveAs(hWndC, (SaveDialog1->FileName+".avi").c_str());//视频
}
Button7->Caption="停止捕获";
}
else
{
Button7->Caption="开始捕获";
capCaptureStop(hWndC);
}
}
//---------------------------------------------------------------------------
---