将图像编码为 base64，得到一个无效的 base64 字符串（ios 使用 base64EncodedStringWithOptions）
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encode image to base64, get a invalid base64 string (ios using base64EncodedStringWithOptions)
提问by Yu-Shing Shen
Here is my code.
这是我的代码。
UIImage *img = [UIImage imageNamed:@"white.jpeg"];
NSData *imageData = UIImagePNGRepresentation(img);
NSString *imageString = [imageData base64EncodedStringWithOptions:0];
NSLog(@"%@", imageString);
And I always get invalid base64 string which include space.
而且我总是得到包含空格的无效 base64 字符串。
iVBORw0KGgoAAAANSUhEUgAAARMAAAC3CAIAAAC MS2jAAAAHGlET1QAAAACAAAAAAAAAFwAAAAoAAAAXAAAAFsAAAMC oRdmgAAAs5JREFUeAHs1tFKI1EABFH//5NNVh02uA LQhwoCZ0zj5LbTlffInl58yCAwM8JvPz8iBMIIPDGHJcAgTMEmHOGmjMIMMcdQOAMAeacoeYMAsxxBxA4Q4A5Z6g5gwBz3IGHIPD zfMQL/fVSzDnKyr 9usEvhHn/ddf5N5/yJx7SflcSoA5KV7hz0Lgn0gPW9h3zsNO81wvdr1e/3w R3PmPNf82p4mcLlcDnlu/txCbvKcDqwP s6pCcu/i8Bhzn/yMOcucD705ARe/z43eY5fbQcN5jz5lVB/k4Bfa5u7alUTYE5NWP4mAeZs7qpVTYA5NWH5mwSYs7mrVjUB5tSE5W8SYM7mrlrVBJhTE5a/SYA5m7tqVRNgTk1Y/iYB5mzuqlVNgDk1YfmbBJizuatWNQHm1ITlbxJgzuauWtUEmFMTlr9JgDmbu2pVE2BOTVj JgHmbO6qVU2AOTVh ZsEmLO5q1Y1AebUhOVvEmDO5q5a1QSYUxOWv0mAOZu7alUTYE5NWP4mAeZs7qpVTYA5NWH5mwSYs7mrVjUB5tSE5W8SYM7mrlrVBJhTE5a/SYA5m7tqVRNgTk1Y/iYB5mzuqlVNgDk1YfmbBJizuatWNQHm1ITlbxJgzuauWtUEmFMTlr9JgDmbu2pVE2BOTVj JgHmbO6qVU2AOTVh ZsEmLO5q1Y1AebUhOVvEmDO5q5a1QSYUxOWv0mAOZu7alUTYE5NWP4mAeZs7qpVTYA5NWH5mwSYs7mrVjUB5tSE5W8SYM7mrlrVBJhTE5a/SYA5m7tqVRNgTk1Y/iYB5mzuqlVNgDk1YfmbBJizuatWNQHm1ITlbxJgzuauWtUEmFMTlr9JgDmbu2pVE2BOTVj JgHmbO6qVU2AOTVh ZsEmLO5q1Y1AebUhOVvEmDO5q5a1QSYUxOWv0mAOZu7alUTYE5NWP4mAeZs7qpVTeADAAD//66TqMcAAAIISURBVO3TsQ0AAAjDMP4/GnEDmc3exSKzjgCBv8D8JxYECKxyPAGBIqCcomZDQDl gEARUE5RsyGgHD9AoAgop6jZEFCOHyBQBJRT1GwIKMcPECgCyilqNgSU4wcIFAHlFDUbAsrxAwSKgHKKmg0B5fgBAkVAOUXNhoBy/ACBIqCcomZDQDl gEARUE5RsyGgHD9AoAgop6jZEFCOHyBQBJRT1GwIKMcPECgCyilqNgSU4wcIFAHlFDUbAsrxAwSKgHKKmg0B5fgBAkVAOUXNhoBy/ACBIqCcomZDQDl gEARUE5RsyGgHD9AoAgop6jZEFCOHyBQBJRT1GwIKMcPECgCyilqNgSU4wcIFAHlFDUbAsrxAwSKgHKKmg0B5fgBAkVAOUXNhoBy/ACBIqCcomZDQDl gEARUE5RsyGgHD9AoAgop6jZEFCOHyBQBJRT1GwIKMcPECgCyilqNgSU4wcIFAHlFDUbAsrxAwSKgHKKmg0B5fgBAkVAOUXNhoBy/ACBIqCcomZDQDl gEARUE5RsyGgHD9AoAgop6jZEFCOHyBQBJRT1GwIKMcPECgCyilqNgSU4wcIFAHlFDUbAsrxAwSKgHKKmg0B5fgBAkVAOUXNhoBy/ACBIqCcomZDQDl gEARUE5RsyGgHD9AoAgop6jZEFCOHyBQBJRT1GwIKMcPECgCB/GnRcSfso/fAAAAAElFTkSuQmCC
So Confused.
如此迷茫。
When I try remove the space in base64 string, and decode it.
当我尝试删除 base64 字符串中的空格并对其进行解码时。
I can't get origin image.
我无法获得原始图像。
回答by Logan
I think you should replace the your options parameter
我认为你应该替换你的选项参数
Change:
改变：
NSString *imageString = [imageData base64EncodedStringWithOptions:0];
To:
到：
NSString *imageString = [imageData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
And just in case you'd like it:
以防万一你喜欢它：
- (NSString *)imageToNSString:(UIImage *)image
{
NSData *data = UIImagePNGRepresentation(image);
return [data base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
}
- (UIImage *)stringToUIImage:(NSString *)string
{
NSData *data = [[NSData alloc]initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];
return [UIImage imageWithData:data];
}
Remember that this is an iOS 7 api.
请记住，这是一个 iOS 7 api。
回答by Fadi Abuzant
replace +to %2Bios replace all + to " " space that make image invalid
将+替换为%2Bios 将所有 + 替换为“” 使图像无效的空格
also backend must handle it too
后端也必须处理它
- (NSString *)base64String:(UIImage*)image {return [[UIImageJPEGRepresentation(image,1) base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed] stringByReplacingOccurrencesOfString:@"+" withString:@"%2B"];}
回答by Yu-Shing Shen
Yap, I find the problem is I don't encode the url.
是的，我发现问题是我没有对 url 进行编码。
In the post data my base64 "+" character was translate to " " character.
在帖子数据中，我的 base64 "+" 字符被转换为 " " 字符。
So I get the invalid base64 string.
所以我得到了无效的 base64 字符串。
Thanks Logan.
谢谢洛根。
回答by Amr Angry
inspired from Fadi Abuzant answer here is the Swift 3 version
受 Fadi Abuzant 的启发，这里的答案是 Swift 3 版本
stringBase64 = stringBase64.replacingOccurrences(of: "+", with: "%2B")
