Question

我尝试使用Objective-c

对url字符串进行编码

// 1. Get string
char res = ((char)(400));
NSString *unencodedString = [NSString stringWithFormat:@"%c",res];

// 2. Encode string
static NSString *escape = @":/?&=;+!@#$()',*[]";
NSString *result = (__bridge_transfer  NSString *)
CFURLCreateStringByAddingPercentEscapes(
                                        NULL,
                                        (__bridge CFStringRef)unencodedString,
                                        NULL,
                                        (__bridge CFStringRef)escape,
                                        kCFStringEncodingUTF8);
// result = %C2%90

但结果不是我所期待的。因为我使用其他编程语言%C6%90。

如您所见，Objective-C结果为%C2%90，但我希望%C6%90。

我的错误在哪里？我做错了吗？

Answer 1

问题是NSString *unencodedString = [NSString stringWithFormat:@"%c",res]不符合你的想法。 char res无法保存大于128的值（unsigned char为256）。

char res = ((char)(400));
NSString *unencodedString = [NSString stringWithFormat:@"%c",res];
XCTAssertEqualObjects(unencodedString, @"\xc2\x90", @"");

static NSString *escape = @":/?&=;+!@#$()',*[]";
NSString *result = (__bridge_transfer  NSString *)
CFURLCreateStringByAddingPercentEscapes(
                                        NULL,
                                        (__bridge CFStringRef)unencodedString,
                                        NULL,
                                        (__bridge CFStringRef)escape,
                                        kCFStringEncodingUTF8);

XCTAssertEqualObjects(result, @"%C2%90", @"");

这是一个有效的例子。

NSString *unencodedString = @"Ɛ";

static NSString *escape = @":/?&=;+!@#$()',*[]";
NSString *result = (__bridge_transfer  NSString *)
CFURLCreateStringByAddingPercentEscapes(
                                        NULL,
                                        (__bridge CFStringRef)unencodedString,
                                        NULL,
                                        (__bridge CFStringRef)escape,
                                        kCFStringEncodingUTF8);
XCTAssertEqualObjects(result, @"%C6%90", @"");

<强>更新

如果您希望此类示例有效，请使用unichar和-stringWithCharacters:length:。

unichar res = ((unichar)(400));
NSString *unencodedString = [NSString stringWithCharacters:&res length:1];
XCTAssertEqualObjects(unencodedString, @"Ɛ", @"");

static NSString *escape = @":/?&=;+!@#$()',*[]";
NSString *result = (__bridge_transfer  NSString *)
CFURLCreateStringByAddingPercentEscapes(
                                        NULL,
                                        (__bridge CFStringRef)unencodedString,
                                        NULL,
                                        (__bridge CFStringRef)escape,
                                        kCFStringEncodingUTF8);
XCTAssertEqualObjects(result, @"%C6%90", @"");

编码url字符串

1 个答案: