// 给上传图像加的水印文字常量
#define kWatermarkString @"renren-inc.com"
/**
* 解析URL参数的工具方法。
*/
+ (NSDictionary *)parseURLParams:(NSString *)query{
NSArray *pairs = [query componentsSeparatedByString:@"&"];
NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
for (NSString *pair in pairs) {
NSArray *kv = [pair componentsSeparatedByString:@"="];
if (kv.count == 2) {
NSString *val =[[kv objectAtIndex:1] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[params setObject:val forKey:[kv objectAtIndex:0]];
}
}
return [params autorelease];
}
/*
* 使用传入的baseURL地址和参数集合构造含参数的请求URL的工具方法。
*/
+ (NSURL*)generateURL:(NSString*)baseURL params:(NSDictionary*)params {
if (params) {
NSMutableArray* pairs = [NSMutableArray array];
for (NSString* key in params.keyEnumerator) {
NSString* value = [params objectForKey:key];
NSString* escaped_value = (NSString *)CFURLCreateStringByAddingPercentEscapes(
NULL, /* allocator */
(CFStringRef)value,
NULL, /* charactersToLeaveUnescaped */
(CFStringRef)@"!*'();:@&=+$,/?%#[]",
kCFStringEncodingUTF8);
[pairs addObject:[NSString stringWithFormat:@"%@=%@", key, escaped_value]];
[escaped_value release];
}
NSString* query = [pairs componentsJoinedByString:@"&"];
NSString* url = [NSString stringWithFormat:@"%@?%@", baseURL, query];
return [NSURL URLWithString:url];
} else {
return [NSURL URLWithString:baseURL];
}
}
/*
* 根据指定的参数名，从URL中找出并返回对应的参数值。
*/
+ (NSString *)getValueStringFromUrl:(NSString *)url forParam:(NSString *)param {
NSString * str = nil;
NSRange start = [url rangeOfString:[param stringByAppendingString:@"="]];
if (start.location != NSNotFound) {
NSRange end = [[url substringFromIndex:start.location + start.length] rangeOfString:@"&"];
NSUInteger offset = start.location+start.length;
str = end.location == NSNotFound
? [url substringFromIndex:offset]
: [url substringWithRange:NSMakeRange(offset, end.location)];
str = [str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}
return str;
}
/**
* 对输入的字符串进行MD5计算并输出验证码的工具方法。
*/
+ (NSString *)md5HexDigest:(NSString *)input{
const char* str = [input UTF8String];
unsigned char result[CC_MD5_DIGEST_LENGTH];
CC_MD5(str, strlen(str), result);
NSMutableString *returnHashSum = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH*2];
for (int i=0; i<CC_MD5_DIGEST_LENGTH; i++) {
[returnHashSum appendFormat:@"%02x", result[i]];
}
return returnHashSum;
}
/**
* 计算sig码的工具方法。
*/
+ (NSString *)generateSig:(NSMutableDictionary *)paramsDict secretKey:(NSString *)secretKey{
NSMutableString* joined = [NSMutableString string];
NSArray* keys = [paramsDict.allKeys sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
for (id obj in [keys objectEnumerator]) {
id value = [paramsDict valueForKey:obj];
if ([value isKindOfClass:[NSString class]]) {
[joined appendString:obj];
[joined appendString:@"="];
[joined appendString:value];
}
}
[joined appendString:secretKey];
return [self md5HexDigest:joined];
}
/**
* 对字符串进行URL编码转换。
*/
+ (NSString*)encodeString:(NSString*)string urlEncode:(NSStringEncoding)encoding {
NSMutableString *escaped = [NSMutableString string];
[escaped setString:[string stringByAddingPercentEscapesUsingEncoding:encoding]];
[escaped replaceOccurrencesOfString:@"&" withString:@"%26" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"+" withString:@"%2B" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"," withString:@"%2C" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"/" withString:@"%2F" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@":" withString:@"%3A" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@";" withString:@"%3B" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"=" withString:@"%3D" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"?" withString:@"%3F" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"@" withString:@"%40" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@" " withString:@"+" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"\t" withString:@"%09" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"#" withString:@"%23" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"<" withString:@"%3C" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@">" withString:@"%3E" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"\"" withString:@"%22" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
[escaped replaceOccurrencesOfString:@"\n" withString:@"%0A" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [escaped length])];
return escaped;
}
+ (NSDate *)getDateFromString:(NSString *)dateTime
{
NSDate *expirationDate =nil;
if (dateTime != nil) {
int expVal = [dateTime intValue];
if (expVal == 0) {
expirationDate = [NSDate distantFuture];
} else {
expirationDate = [NSDate dateWithTimeIntervalSinceNow:expVal];
}
}
return expirationDate;
}
+ (UIImage *)getImageWithWatermark:(UIImage *)inImage{
CGRect imageViewFrame = CGRectMake(0, 0, inImage.size.width, inImage.size.height);
UIImageView *imageView = [[UIImageView alloc] initWithImage:inImage];
imageView.frame = imageViewFrame;
UILabel *label = [[UILabel alloc] init];
CGRect labelFrame = CGRectMake(10, imageViewFrame.size.height-40, imageViewFrame.size.width-20, 30);
label.frame = labelFrame;
label.text = kWatermarkString;
label.textAlignment = UITextAlignmentRight;
label.backgroundColor = [UIColor clearColor];
[imageView addSubview:label];
UIGraphicsBeginImageContext(imageViewFrame.size);
[imageView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *outImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outImage;
}
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