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各种数据类型之间的转换

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  1. NSData-> NSString
NSString *aString 
 = [[NSString alloc] initWithData:adata encoding:NSUTF8StringEncoding];
  1. NSString->NSData
NSString *aString = @"1234abcd";
NSData *aData = [aString dataUsingEncoding: NSUTF8StringEncoding];
  1. NSData-> Byte数组
NSString *testString = @"1234567890";
NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding];
Byte *testByte = (Byte *)[testData bytes];
for(int i=0;i<[testData length];i++) {
       printf("testByte = %d\n",testByte[i]);
}
  1. Byte数组-> NSData
Byte byte[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23};
NSData *adata = [[NSData alloc] initWithBytes:byte length:24];
  1. NSData->UIImage
UIImage *aimage = [UIImage imageWithData: imageData];
//例:从本地文件沙盒中取图片并转换为NSData
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *name = [NSString stringWithFormat:@"ceshi.png"];
NSString *finalPath = [path stringByAppendingPathComponent:name];
NSData *imageData = [NSData dataWithContentsOfFile: finalPath];
  1. UIImage-> NSData
UIImage *aimage = [UIImage imageWithData: imageData];

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