攝像頭控制

//VC-攝像頭控制SDK源碼
#include <windows.h>
#include <stdio.h>
#include <vfw.h>
#pragma comment(lib,"vfw32.lib")

HWND ghWndCap ; //捕獲窗的句柄
CAPDRIVERCAPS gCapDriverCaps ; //視頻驅動器的能力
CAPSTATUS gCapStatus ; //捕獲窗的狀態
char szCaptureFile[] = "MYCAP.AVI";
char gachBuffer[20];

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

LRESULT CALLBACK StatusCallbackProc(HWND hWnd,int nID,LPSTR lpStatusText)
{
    if(!ghWndCap) return FALSE;//獲得捕獲窗的狀態
    capGetStatus(ghWndCap,&gCapStatus,sizeof(CAPSTATUS));//更新捕獲窗的大小
    SetWindowPos(ghWndCap,NULL,0,0,gCapStatus.uiImageWidth,gCapStatus.uiImageHeight,SWP_NOZORDER|SWP_NOMOVE);
    if(nID==0)
    {
        //清除舊的狀態信息
        SetWindowText(ghWndCap,(LPSTR)"hello");
        return (LRESULT)TRUE;
    }
    //顯示狀態ID和狀態文本
    wsprintf(gachBuffer,"Status# %d: %s",nID,lpStatusText);
    SetWindowText(ghWndCap,(LPSTR)gachBuffer);
    return (LRESULT)TRUE;
}

LRESULT CALLBACK ErrorCallbackProc(HWND hWnd,int nErrID,LPSTR lpErrorText)
{
    if(!ghWndCap)return FALSE;
    if(nErrID==0)return TRUE;//清除舊的錯誤
    wsprintf(gachBuffer,"Error# %d",nErrID);//顯示錯誤標識和文本
    MessageBox(hWnd, lpErrorText, gachBuffer,MB_OK | MB_ICONEXCLAMATION);
    return (LRESULT) TRUE;
}

LRESULT CALLBACK FrameCallbackProc(HWND hWnd,LPVIDEOHDR lpVHdr)
{
    FILE *fp;
    fp=fopen("caram.dat","w");
    if(!ghWndCap)return FALSE;//假設fp爲一打開的.dat文件指針
    fwrite(lpVHdr->lpData,1,lpVHdr->dwBufferLength,fp);
    return (LRESULT)TRUE;
}


int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
    static TCHAR szAppName[]=TEXT("HelloWin");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndclass;
    wndclass.style=CS_HREDRAW|CS_VREDRAW;
    wndclass.lpfnWndProc=WndProc;
    wndclass.cbClsExtra=0;
    wndclass.cbWndExtra=0;
    wndclass.hInstance=hInstance;
    wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
    wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName=NULL;
    wndclass.lpszClassName=szAppName;
    if(!RegisterClass(&wndclass))
    {
        MessageBox(NULL,TEXT("This program requires WindowsNT!"),szAppName,MB_ICONERROR);
        return 0;
    }
    hwnd=CreateWindow(szAppName,TEXT("The Hello Program"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
    ShowWindow(hwnd,iCmdShow);
    UpdateWindow(hwnd);
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    RECT rect;
    switch(message)
    {
    case WM_CREATE:
        {
            ghWndCap=capCreateCaptureWindow((LPSTR)"Capture  Window",WS_CHILD|WS_VISIBLE,0,0,300,240,(HWND)hwnd,(int)0);
            capSetCallbackOnError(ghWndCap,(FARPROC)ErrorCallbackProc);
            capSetCallbackOnStatus(ghWndCap,(FARPROC)StatusCallbackProc);
            capSetCallbackOnFrame(ghWndCap,(FARPROC)FrameCallbackProc);
            capDriverConnect(ghWndCap,0); // 將捕獲窗同驅動器連接 
            //獲得驅動器的能力,相關的信息放在結構變量gCapDriverCaps中
            capDriverGetCaps(ghWndCap,&gCapDriverCaps,sizeof(CAPDRIVERCAPS));
            capPreviewRate(ghWndCap, 66); // 設置Preview模式的顯示速率
            capPreview(ghWndCap, TRUE); //啓動Preview模式
            if(gCapDriverCaps.fHasOverlay) //檢查驅動器是否有疊加能力
                capOverlay(ghWndCap,TRUE); //啓動Overlay模式
            if(gCapDriverCaps.fHasDlgVideoSource)capDlgVideoSource(ghWndCap); //Video source 對話框
            if(gCapDriverCaps.fHasDlgVideoFormat)capDlgVideoFormat(ghWndCap); // Video format 對話框
            if(gCapDriverCaps.fHasDlgVideoDisplay)capDlgVideoDisplay(ghWndCap); // Video display 對話框
            capFileSetCaptureFile( ghWndCap, szCaptureFile); //指定捕獲文件名
            capFileAlloc(ghWndCap, (1024L * 1024L * 5)); //爲捕獲文件分配存儲空間
            capCaptureSequence(ghWndCap); //開始捕獲視頻序列
            capGrabFrame(ghWndCap); //捕獲單幀圖像
           
        }
        return 0;
    case WM_PAINT:
        hdc=BeginPaint(hwnd,&ps);
        GetClientRect(hwnd,&rect);
        DrawText(hdc,TEXT("Hello,Windows98!"),-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
        EndPaint(hwnd,&ps);
        return 0;
    case WM_DESTROY:
        {
            capSetCallbackOnStatus(ghWndCap,NULL);
            capSetCallbackOnError(ghWndCap,NULL);
            capSetCallbackOnFrame(ghWndCap,NULL);
            capCaptureAbort(ghWndCap);//停止捕獲
            capDriverDisconnect(ghWndCap); //將捕獲窗同驅動器斷開
            PostQuitMessage(0);
        }
        return 0;
    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}