1. 背景
鉴于网上使用MonkeyImage的实例除了方法sameAs外很难找到，所以本人把实践各个API的过程记录下来然自己有更感性的认识，也为往后的工作打下更好的基础。同时也和上一篇文章《MonkeyDevcie API 实践全记录》起到相互呼应的作用。
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因为并没有MonkeyRunner的项目背景，所以这里更多的是描述各个API是怎么一回事，而不是描述在什么场景下需要用到。也就是说是去回答What，而不是How。
首先我们先看下官方给出的MonkeyImage的API描述，对比我现在反编译的最新的源码是一致的：
| Return Type | Methods | Comment |
| string | convertToBytes (string format) Converts the current image to a particular format and returns it as a string that you can then access as an iterable of binary bytes. | |
| tuple | getRawPixel (integer x, integer y) Returns the single pixel at the image location (x,y), as an a tuple of integer, in the form (a,r,g,b). | |
| integer | getRawPixelInt (integer x, integer y) Returns the single pixel at the image location (x,y), as a 32-bit integer. | |
| MonkeyImage
| getSubImage (tuple rect) Creates a new MonkeyImage object from a rectangular selection of the current image. | |
| boolean | sameAs (MonkeyImage other, float percent) Compares this MonkeyImage object to another and returns the result of the comparison. Thepercent argument specifies the percentage difference that is allowed for the two images to be "equal". | |
| void | writeToFile (string path, string format) Writes the current image to the file specified by filename, in the format specified by format. | |
2. String convertToBytes(string format)
2.1 示例
img = device.takeSnapshot() png1 = img.convertToBytes() png2 = img.convertToBytes() bmp = img.convertToBytes('bmp') jpg = img.convertToBytes('JPG') gif = img.convertToBytes('gif') raw = img.convertToBytes('raw') invalid = img.convertToBytes('xxx') #is the 2 pngs equal? print "Two png is equal in bytes:",png1 == png2 #is the png equals to bmp? print "png and bmp is equal in bytes:", png1 == bmp #is the jpg eqals to the raw? print "jpg and bmp is equals in bytes:",jpg == bmp #is the jpg eqals to the xxx? print "jpg is a valid argument:",jpg != invalid #is the gif eqals to the xxx? print "gif is a valid argument:",gif != invalid #is the bmp eqals to the xxx? print "bmp is a valid argument:",bmp != invalid #is the raw equas to xxxx? aims at checking whether argument 'raw' is invalid like 'xxx' print 'raw is a valid argument:',raw != invalid #would invalid argument drop to png by default? print 'Would invalid argument drop to png by default:',png1 == invalid输出：
2.2 分析
除了默认的png，常用格式jpg,gif都支持，但bmp格式无效，至于还支持什么其他格式，尝试跟踪了下代码，没有找到想要的结果
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