在OSX上进行屏幕截图

Question

我需要流式传输我Mac的桌面，让其他人能够观看我正在做什么。我尝试过使用VLC（在当前稳定版本中不再起作用）。我尝试过使用ffmpeg，在osx上不再支持x11grab选项。您知道有没有商业或免费的软件可以录屏和流媒体？或者是一些可以通过管道传输到ffmpeg或vlc的东西？或者你能否指导我学习如何构建一个非常基本的用于捕获屏幕的osx应用程序？ 谢谢

- user1170896

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你看过这个在OSX上用C++截屏的内容吗？有很多链接，尤其是最后一个。 - Mike Versteeg

我编写了这段C代码来捕获Mac屏幕并通过函数glDrawPixels在OpenGL窗口中显示它：opengl-capture.chttp://pastebin.com/pMH2rDNH - Juan Carlos Kuri Pinto

Answer 1

这是一个捕获屏幕并将其保存为文件的示例代码，对我很有效。

/**
    Record the current screen to the destination path mentioned.
 **/

-(void)screenRecording:(NSURL *)destPath {
    
    //Create capture session
    mSession = [[AVCaptureSession alloc] init];
    
    //Set session preset
    //mSession.sessionPreset = AVCaptureSessionPresetMedium;
    mSession.sessionPreset = AVCaptureSessionPreset1280x720;
    
    //Specify display to be captured
    CGDirectDisplayID displayId = kCGDirectMainDisplay;
    
    //Create AVCaptureScreenInput with the display id
    AVCaptureScreenInput *input = [[AVCaptureScreenInput alloc] initWithDisplayID:displayId];
    if(!input) {
        //if input is null
        return;
    }
    
    //if input is not null and can be added to the session
    if([mSession canAddInput:input]) {
        //Add capture screen input to the session
        [mSession addInput:input];
    }
    
    //Create AVCaptureMovieFileOutput
    mMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
    mMovieFileOutput.delegate = self;
    
    if([mSession canAddOutput:mMovieFileOutput]) {
        //If movie file output can be added to session, then add it the session
        [mSession addOutput:mMovieFileOutput];
    }
    
    //Start running the session
    [mSession startRunning];
    
    //Check whether the movie file exists already
    if([[NSFileManager defaultManager] fileExistsAtPath:[destPath path]]) {
        NSError *err;
        //If the movie file exists already, then delete it
        if(![[NSFileManager defaultManager] removeItemAtPath:[destPath path] error:&err]) {
            NSLog(@"Error deleting existing movie file %@", [err localizedDescription]);
        }
    }
    
    //Start recording to destination path using the AVCaptureMovieFileOutput
    [mMovieFileOutput startRecordingToOutputFileURL:destPath recordingDelegate:self];
    
}

您可以在http://developer.apple.com/library/mac/#qa/qa1740/_index.html找到示例代码。

请查看该网址。这可能会帮助您至少创建一个捕获屏幕的基本应用程序。

- SG39