在AVI文件中隐藏信息

【IT168技术文档】

  Windows AVI 库是avifil32.dll中函数的集合. 使用之前先得用 AVIFileInit初始化. AVIFileOpen 打开文件, AVIFileGetStream 取得视频流. 这些函数申请的内存最后都必须释放. AVI文件可以包含四种不同类型的多个流,通常每种类型只有一个流,我们这里只关心视频流.

//Initialize the AVI library
[DllImport("avifil32.dll")]
public static extern void AVIFileInit();
//Open an AVI file
[DllImport("avifil32.dll", PreserveSig=true)]
public static extern int AVIFileOpen(
ref int ppfile,
String szFile,
int uMode,
int pclsidHandler);
//Get a stream from an open AVI file
[DllImport("avifil32.dll")]
public static extern int AVIFileGetStream(
int pfile,
out IntPtr ppavi,
int fccType,
int lParam);
//Release an open AVI stream
[DllImport("avifil32.dll")]
public static extern int AVIStreamRelease(IntPtr aviStream);
//Release an ope AVI file
[DllImport("avifil32.dll")]
public static extern int AVIFileRelease(int pfile);
//Close the AVI library
[DllImport("avifil32.dll")]
public static extern void AVIFileExit();
private int aviFile = 0;
private IntPtr aviStream;
public void Open(string fileName) {
AVIFileInit(); //Intitialize AVI library
//Open the file
    int result = AVIFileOpen(
ref aviFile,
fileName,
OF_SHARE_DENY_WRITE, 0);
//Get the video stream
    result = AVIFileGetStream(
aviFile,
out aviStream,
streamtypeVIDEO, 0);
}