Use Makefile to create a Dylib instance under the iPhone

PassMakefileInIPhoneCreateDylibThe instance is the content to be introduced in this article. First, I want to declare thatDylibIt cannot be escaped.IphoneOn c. I wrote this article to improve the previous article.

1. Create dylibtest. c and. h.

A test function is written here.

Dylibtest. h

Void test ();
 
Dylibtest. c

 
 

  
  
#include "dylibtest.h"  
  
  
#include "stdio.h"  
  
  
void test() {  
  
  
    printf("this is a test\n");  
  
  
}  
  
  
 
  
  
makefile   
  
  
 
  
  
CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc  
  
  
CFLAGS= -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk  
  
  
CPP=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/cpp  
  
  
target:  
  
  
 $(CC) $(CFLAGS) -dynamiclib -o sotest-iphone.dylib dylibtest.c 
 
 

Here we use sdk4.2 arch as armv6, and we also need to remind you that if you compile the. m file and use the framework, you can write it like this during compilation.

 
 

  
  
-framework Foundation 
 
 

The following is the test code testdylib.

The key code is as follows:

 
 

  
  
NSString *path = [[NSBundle mainBundle] pathForResource:@"sotest-iphone" ofType:@"dylib"];  
  
  
void* handle = dlopen([path cStringUsingEncoding:NSUTF8StringEncoding], RTLD_LAZY);  
  
  
if (!handle) {  
  
  
    printf("%s\n", dlerror());  
  
  
    return;  
  
  
}  
  
  
void (*test)();  
  
  
test = (void (*)())dlsym(handle, "test");  
  
  
const char *dlsym_error = dlerror();  
  
  
if (dlsym_error) {  
  
  
    printf("%s\n", dlsym_error);  
  
  
    dlclose(handle);  
  
  
    return;  
  
  
}  
  
  
// use it to do the calculation  
  
  
test();      
  
  
// close the library  
  
  
dlclose(handle); 
 
 

You can test it, but I believe the result will not be satisfactory to you.

Conclusion: PassMakefileInIPhoneCreateDylibI hope this article will help you with the introduction of the instance!