如何在Jailbroken iOS设备上截取整个屏幕的截图？ [英] How to take screenshot of entire screen on a Jailbroken iOS Device?

问题描述

我需要截取整个屏幕的截图，包括状态栏，我使用 CARenderServerRenderDisplay 来实现这一点，它可以在iPad上正常工作，但在iPhone 6 Plus上却出错了。作为代码中*标记的部分，如果我设置 width = screenSize.width * scale 和 height = screenSize.height * scale ，它会导致崩溃，如果我只是将其更改为： width = screenSize.height * scale 和 height = screenSize.width * scale ，它会起作用，但会生成如下图像：
，我尝试了很多但没有找到理由，有没有人知道？我希望我已经足够清楚地描述了它。

I need to take screenshot of the whole screen including the status bar, I use CARenderServerRenderDisplay to achieve this, it works right on iPad, but wrong at iPhone 6 Plus. As the * marked part in the code, if I set width=screenSize.width*scale and height=screenSize.height*scale, it will cause crash, if I just change them as:width=screenSize.height*scale and height=screenSize.width*scale, it will works, but produce a image like that: , I've tried much but no reason found, does anyone know that? I hope I've described it clear enough.

- (void)snapshot
{
    CGFloat scale = [UIScreen mainScreen].scale;
    CGSize screenSize = [UIScreen mainScreen].bounds.size;

    //*********** the place where problem appears        
    size_t width = screenSize.height * scale;
    size_t height = screenSize.width * scale;
    //***********

    size_t bytesPerElement = 4;
    OSType pixelFormat = 'ARGB';
    size_t bytesPerRow = bytesPerElement * width;
    size_t surfaceAllocSize = bytesPerRow * height;

    NSDictionary *properties = [NSDictionary dictionaryWithObjectsAndKeys:
                                [NSNumber numberWithBool:YES], kIOSurfaceIsGlobal,
                                [NSNumber numberWithUnsignedLong:bytesPerElement], kIOSurfaceBytesPerElement,
                                [NSNumber numberWithUnsignedLong:bytesPerRow], kIOSurfaceBytesPerRow,
                                [NSNumber numberWithUnsignedLong:width], kIOSurfaceWidth,
                                [NSNumber numberWithUnsignedLong:height], kIOSurfaceHeight,
                                [NSNumber numberWithUnsignedInt:pixelFormat], kIOSurfacePixelFormat,
                                [NSNumber numberWithUnsignedLong:surfaceAllocSize], kIOSurfaceAllocSize,
                                nil];

    IOSurfaceRef destSurf = IOSurfaceCreate((__bridge CFDictionaryRef)(properties));

    IOSurfaceLock(destSurf, 0, NULL);
    CARenderServerRenderDisplay(0, CFSTR("LCD"), destSurf, 0, 0);
    IOSurfaceUnlock(destSurf, 0, NULL);

    CGDataProviderRef provider =  CGDataProviderCreateWithData(NULL, IOSurfaceGetBaseAddress(destSurf), (width * height * 4), NULL);
    CGImageRef cgImage = CGImageCreate(width, height, 8,
                                       8*4, IOSurfaceGetBytesPerRow(destSurf),
                                       CGColorSpaceCreateDeviceRGB(), kCGImageAlphaNoneSkipFirst |kCGBitmapByteOrder32Little,
                                       provider, NULL, YES, kCGRenderingIntentDefault);
    UIImage *image = [UIImage imageWithCGImage:cgImage];
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}

推荐答案

如果你在越狱环境，你可以使用私人 UIImage 方法 _UICreateScreenUIImage ：

If you are on a Jailbroken environment, you can use the private UIImage method _UICreateScreenUIImage:

OBJC_EXTERN UIImage *_UICreateScreenUIImage(void);

// ...

- (void)takeScreenshot {
    UIImage *screenImage = _UICreateScreenUIImage();
    // do something with your screenshot
}

此方法使用 CARenderServerRenderDisplay 可以更快地呈现整个设备屏幕。它取代了在arm64版本的iOS 7 SDK中删除的 UICreateScreenImage 和 UIGetScreenImage 方法。

This method uses CARenderServerRenderDisplay for faster rendering of the entire device screen. It replaces the UICreateScreenImage and UIGetScreenImage methods that were removed in the arm64 version of the iOS 7 SDK.

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