[英]Zlib in Xcode using objective c
I am using this link as my CDTest.h and CDTest.m and in my TestAppDelegate.mi am calling these class with button action as 我将此链接用作CDTest.h和CDTest.m,并在我的TestAppDelegate.mi中使用按钮操作调用这些类,如下所示:
-(IBAction)Zipbtn:(id)sender{
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSLog(@"paths=%@",paths);
NSString* dPath = [paths objectAtIndex:0];
NSLog(@"dpaths=%@",dPath);
NSString* txtfile = [dPath stringByAppendingPathComponent:@"test.txt"];
NSLog(@"txtfile=%@",txtfile);
NSData* data=[txtfile dataUsingEncoding:NSUTF8StringEncoding];
NSLog(@"data=%@",data);
CDTest *obj=[[CDTest alloc]init];
[obj gzipData:data];
}
but showing 但显示
warning instance method -gzipData not found also on button click shows :-[CDTest gzipData:]: unrecognized selector sent to instance 0x7f8d7a009070 Please help me out as i am new to Mac osx. 警告实例方法-gzipData也未在按钮单击上找到:-[CDTest gzipData:]:无法识别的选择器已发送到实例0x7f8d7a009070,因为我是Mac osx的新手,请帮帮我。
The method is a class method - not an instance method. 该方法是一个类方法-不是实例方法。 You should be using: 您应该使用:
[CDTest gzipData:data]
Additionally, you're actually creating an NSData from the string when you do: 此外,执行以下操作实际上是根据字符串创建NSData:
NSData* data=[txtfile dataUsingEncoding:NSUTF8StringEncoding];
What you want to do is get the data from the content of the file, which is: 您要做的是从文件内容中获取数据,即:
NSData *data = [NSData dataWithContentsOfFile:txtfile];
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