xcode 链接器/解析器错误
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Linker/Parser error
提问by 0x0
I'm trying to learn Objective-C and my program (creating a calculator) gets linker or parser error that I'm not able to figure out. I don't know what can cause this problem. I'm using Xcode 4.1
我正在尝试学习 Objective-C，而我的程序（创建计算器）出现了我无法弄清楚的链接器或解析器错误。我不知道是什么导致了这个问题。我正在使用 Xcode 4.1
#include <Foundation/Foundation.h>
@interface Calculator: NSObject
{
double accumulator;
}
// accumulator methods
- (void) setAccumulator: (double) value;
- (void) clear;
-(double) accumulator;
// arithmetic methods
-(void) add: (double) value;
-(void) subtract: (double) value;
-(void) multiply: (double) value;
-(void) divide: (double) value;
@end
@implementation Calculator
-(void) setAccumulator: (double) value
{
accumulator = value;
}
-(void) clear {
accumulator = 0;
}
-(double) accumulator {
return accumulator;
}
-(void) add: (double) value {
accumulator += value;
}
-(void) subtract: (double) value {
accumulator -= value;
}
-(void) multiply: (double) value {
accumulator *= value;
}
-(void) divide: (double) value {
accumulator /= value;
}
@end
int main (int argc, char *argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
double value1, value2;
char operator;
Calculator *deskCalc = [[Calculator alloc] init];
NSLog (@"Type in your expression.");
scanf ("%lf %c %lf", &value1, &operator, &value2);
[deskCalc setAccumulator: value1];
if ( operator == '+' )
[deskCalc add: value2];
else if ( operator == '-' )
[deskCalc subtract: value2];
else if ( operator == '*' )
[deskCalc multiply: value2];
else if ( operator == '/' )
[deskCalc divide: value2];
NSLog (@"%.2f", [deskCalc accumulator]);
[deskCalc release];
[pool drain];
return 0;
}
I'm guessing it has to do something with the header?!?!? the exact error messages are :
我猜它必须对标题做些什么？！？！？确切的错误消息是：
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:299:1: error: expected identifier or '(' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:301:19: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:302:44: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:304:19: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:305:43: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:307:19: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:307:50: error: unknown type name 'Protocol' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:308:19: error: unknown type name 'Protocol' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:308:50: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:312:30: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:312:53:{312:53-312:76}: error: format argument not an NSString [3]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:313:31: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:313:63:{313:63-313:86}: error: format argument not an NSString [3]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h:8:1: error: expected identifier or '(' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h:16:52: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h:17:19: error: unknown type name 'NSString' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:8:1: error: expected identifier or '(' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:9:1: error: expected identifier or '(' [1]
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:13:1: error: expected identifier or '(' [1]
fatal error: too many errors emitted, stopping now [-ferror-limit=]
I'm not able to see anything like a foundation tool as mentioned in the answers. Here is a screenshot :
我看不到答案中提到的任何类似基础工具的东西。这是一个屏幕截图：
Program from the book example : Programming in Objective C (3rd edition) - Pg 125
本书示例中的程序：Objective C 中的编程（第 3 版）- 第 125 页
回答by chown
You may not have chose the correct Foundation project template:
您可能没有选择正确的 Foundation 项目模板：
So check that the Foundation Framework is included in your project:
因此，请检查您的项目中是否包含 Foundation Framework：
From the second image below, type in Foundation and select "Foundation.framework", then "Clean" and "Build" again.
从下面的第二张图片中，输入 Foundation 并选择“Foundation.framework”，然后再次选择“Clean”和“Build”。
回答by electromaggot
Another thing to try: rename your code file from *.cpp to *.mm
另一件事要尝试：将您的代码文件从 *.cpp 重命名为 *.mm
回答by Jim
When you created the project, you chose Cas the type. Try Foundationinstead.
创建项目时，您选择C了类型。试试吧Foundation。
回答by TJez
Use #import <Foundation/Foundation.h>
用 #import <Foundation/Foundation.h>
#importis better than #include... it guarantees that the imported header is introduced only once.
#import比#include...更好，它保证导入的标头只引入一次。
Make sure you have "Foundation" in your project frameworks.
确保您的项目框架中有“基础”。
