用C ++拍摄视频（vga）相机的照片 [英] Take a picture of the video(vga) camera in C++

问题描述

我已经看过很多关于如何用C＃拍照的回复，但是我需要用C ++拍摄这张照片，我用它作为随SDK提供的Skeletal Viewer的基础。目前我正在这样做：

 

 

 
  void  CSkeletalViewerApp :: Nui_GotVideoAlert（）
 
 {
 
  const  NUI_IMAGE_FRAME * pImageFrame = NULL; 
 
  float  timestamp = NULL; 
 
  char  * filename = NULL; 
 
 
 
 HRESULT hr = NuiImageStreamGetNextFrame（
 
 m_pVideoStreamHandle，
 
 0，
 
& ; pImageFrame）; 
 
  if （FAILED（hr））
 
 {
 
 返回; 
 
} 
 
 
 
 NuiImageBuffer * pTexture = pImageFrame-> pFrameTexture; 
 
 KINECT_LOCKED_RECT LockedRect; 
 
 pTexture-> LockRect（0，& LockedRect，NULL，0）; 
 
 
 
 filename = " 5.bmp" ; 
 
 
 
 FILE * pFile = fopen（文件名，" wb" ）; 
 
 
 
 BITMAPINFOHEADER BMIH; 
 
 
 
 BMIH.biSize =  sizeof （BITMAPINFOHEADER）; 
 
 BMIH.biBitCount = 24; 
 
 BMIH.biPlanes = 0; 
 
 BMIH.biCompression = 0; 
 
 BMIH.biWidth = 640; 
 
 BMIH.biHeight = 480; 
 
 BMIH.biSizeImage =（（（（BMIH.biWidth * BMIH.biBitCount）
 
 + 31）& ~31）>> 3）* BMIH.biHeight ; 
 
 
 
 BITMAPFILEHEADER bmfh; 
 
 
 
  int  nBitsOffset =  sizeof  （BITMAPFILEHEADER）+ BMIH.biSize; 
 
 LONG lImageSize = BMIH.biSizeImage; 
 
 LONG lFileSize = nBitsOffset + lImageSize; 
 
 bmfh.bfType ='B'+（'M'<< 8）; 
 
 bmfh.bfOffBits = nBitsOffset; 
 
 bmfh.bfSize = lFileSize; 
 
 bmfh.bfReserved1 = bmfh.bfReserved2 = 0; 
 
  //写位图文件头 
 
 
 
 UINT nWrittenFileHeaderSize = fwrite （& bmfh，1，
 
  sizeof （BITMAPFILEHEADER），pFile）; 
 
  //然后是位图信息标题 
 
 
 
 UINT nWrittenInfoHeaderSize = fwrite（& BMIH，
 
 1， sizeof （BITMAPINFOHEADER），pFile）; 
 
  //最后，自己编写图像数据 
 
 
 
  //  - 数据代表我们的绘图 
 
 
 
 
 
 
 
 
 
  if （LockedRect.Pitch！= 0）
 
 {
 
 BYTE * pBuffer =（BYTE *）LockedRect.pBits; 
 
 
 
 m_DrawVideo.DrawFrame（（BYTE *）pBuffer）; 
 
 
 
 
 
} 
 
  else  
 
 {
 
 OutputDebugString（L "接收纹理的缓冲区长度为bogus \\\\ nn" ）; 
 
} 
 
 UINT nWrittenDIBDataSize = 
 
 fwrite（pImageFrame-> pFrameTexture，1，BMIH.biSizeImage，pFile）; 
 
 
 
 NuiImageStreamReleaseFrame（m_pVideoStreamHandle，pImageFrame）; 
 
 fclose（pFile）; 
 
} 
 

解决方案

Lino，

返回给你的数据实际上是每像素32位，即使其中只有24位有信息。此外，您应该使用LockedRect.pBits来编写图像数据，而不是pImageFrame-pFrameTexture：

 char * filename = filename = " snapshot.bmp英寸; 
 FILE * pFile = NULL; 
 fopen_s（& pFile，filename，" wb"）; 
 
 BITMAPINFOHEADER BMIH = {0}; 
 BMIH.biSize = sizeof（BITMAPINFOHEADER）; 
 BMIH.biBitCount = 32; 
 BMIH.biPlanes = 1; 
 BMIH.biCompression = BI_RGB; 
 BMIH.biWidth = 640; 
 BMIH.biHeight = 480; 
 BMIH.biSizeImage =（（（（BMIH.biWidth * BMIH.biBitCount）+ 31）& ~31）>> 3）* BMIH.biHeight; 
 
 BITMAPFILEHEADER bmfh = {0}; 
 int nBitsOffset = sizeof（BITMAPFILEHEADER）+ BMIH.biSize; 
 LONG lImageSize = BMIH.biSizeImage; 
 LONG lFileSize = nBitsOffset + lImageSize; 
 bmfh.bfType ='B'+（'M'<< 8）; 
 bmfh.bfOffBits = nBitsOffset; 
 bmfh.bfSize = lFileSize; 
 
 //写位图文件头
 fwrite（& bmfh，1，sizeof（BITMAPFILEHEADER），pFile）; 
 
 //然后是位图信息标题
 fwrite（& BMIH，1，sizeof（BITMAPINFOHEADER），pFile）; 
 
 //最后，写出图像数据本身
 fwrite（LockedRect.pBits，1，BMIH.biSizeImage，pFile）; 
 
 fclose（pFile）; 
 

希望这会有所帮助！

Eddy

I've seen a lot of replies of how to take a picture in C#, but I would need to take this picture in C++, I'm using as a base the Skeletal Viewer provided with the SDK. At the moment I'm doing this:

 

 

void CSkeletalViewerApp::Nui_GotVideoAlert( )

{

    const NUI_IMAGE_FRAME * pImageFrame = NULL;

	float timestamp=NULL;

	char *filename=NULL;



    HRESULT hr = NuiImageStreamGetNextFrame(

        m_pVideoStreamHandle,

        0,

        &pImageFrame );

    if( FAILED( hr ) )

    {

        return;

    }



    NuiImageBuffer * pTexture = pImageFrame->pFrameTexture;

    KINECT_LOCKED_RECT LockedRect;

    pTexture->LockRect( 0, &LockedRect, NULL, 0 );



		filename="5.bmp";



	    FILE *pFile = fopen(filename, "wb");



		BITMAPINFOHEADER BMIH;



		BMIH.biSize = sizeof(BITMAPINFOHEADER);

        BMIH.biBitCount = 24;

        BMIH.biPlanes = 0;

        BMIH.biCompression = 0;

        BMIH.biWidth = 640;

        BMIH.biHeight = 480;

        BMIH.biSizeImage = ((((BMIH.biWidth * BMIH.biBitCount) 

                           + 31) & ~31) >> 3) * BMIH.biHeight;



        BITMAPFILEHEADER bmfh;



        int nBitsOffset = sizeof(BITMAPFILEHEADER) + BMIH.biSize; 

        LONG lImageSize = BMIH.biSizeImage;

        LONG lFileSize = nBitsOffset + lImageSize;

        bmfh.bfType = 'B'+('M'<<8);

        bmfh.bfOffBits = nBitsOffset;

        bmfh.bfSize = lFileSize;

        bmfh.bfReserved1 = bmfh.bfReserved2 = 0;

        //Write the bitmap file header



        UINT nWrittenFileHeaderSize = fwrite(&bmfh, 1, 

                     sizeof(BITMAPFILEHEADER), pFile);

        //And then the bitmap info header



        UINT nWrittenInfoHeaderSize = fwrite(&BMIH, 

               1, sizeof(BITMAPINFOHEADER), pFile);

        //Finally, write the image data itself 



        //-- the data represents our drawing









    if( LockedRect.Pitch != 0 )

    {

        BYTE * pBuffer = (BYTE*) LockedRect.pBits;



        m_DrawVideo.DrawFrame( (BYTE*) pBuffer );





    }

    else

    {

        OutputDebugString( L"Buffer length of received texture is bogus\r\n" );

    }

			UINT nWrittenDIBDataSize = 

				fwrite(pImageFrame->pFrameTexture, 1,BMIH.biSizeImage, pFile);



    NuiImageStreamReleaseFrame( m_pVideoStreamHandle, pImageFrame );

	fclose(pFile);

}

解决方案

Lino,

The data returned to you is actually 32-bits per pixel, even if only 24 of those have information. Also, you should use LockedRect.pBits to write image data, rather than pImageFrame-pFrameTexture:

char *filename=filename="snapshot.bmp";
FILE *pFile = NULL;
fopen_s(&pFile, filename, "wb");
	
BITMAPINFOHEADER BMIH = {0};
BMIH.biSize = sizeof(BITMAPINFOHEADER);
BMIH.biBitCount = 32;
BMIH.biPlanes = 1;
BMIH.biCompression = BI_RGB;
BMIH.biWidth = 640;
BMIH.biHeight = 480;
BMIH.biSizeImage = ((((BMIH.biWidth * BMIH.biBitCount) + 31) & ~31) >> 3) * BMIH.biHeight;

BITMAPFILEHEADER bmfh = {0};
int nBitsOffset = sizeof(BITMAPFILEHEADER) + BMIH.biSize; 
LONG lImageSize = BMIH.biSizeImage;
LONG lFileSize = nBitsOffset + lImageSize;
bmfh.bfType = 'B'+('M'<<8);
bmfh.bfOffBits = nBitsOffset;
bmfh.bfSize = lFileSize;

//Write the bitmap file header
fwrite(&bmfh, 1, sizeof(BITMAPFILEHEADER), pFile);

//And then the bitmap info header
fwrite(&BMIH, 1, sizeof(BITMAPINFOHEADER), pFile);

//Finally, write the image data itself
fwrite(LockedRect.pBits, 1,BMIH.biSizeImage, pFile);

fclose(pFile);

Hope this helps!
Eddy

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