IOS高级开发～底层实现资源收集
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注意：dlopen（）一个路径时候要以你本机的路径为准，我的路径为（首先右键你的XCode，然后查看Content）：
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
1、NSArray & NSAutoreleasePool 实现
#include <objc/runtime.h>#include <dlfcn.h>#include <stdio.h> int main() { void *sdl_library = dlopen("/System/Library/Frameworks/Foundation.framework/Versions/Current/Foundation", RTLD_LAZY); if (sdl_library == NULL) { printf("Got dlopen error!\n"); } else { printf("dlopen successful!\n"); // Set up an NSAutoreleasePool Class nsautoreleasepool = objc_getClass("NSAutoreleasePool"); id pool = class_createInstance(nsautoreleasepool, 0); SEL initSel = sel_registerName("init"); id poolAfterInit = objc_msgSend(pool, initSel); // Create an NSMutableArray Class nsmutablearray = objc_getClass("NSMutableArray"); // Regular way to create an NSMutableArray, // equivalent to [[NSMutableArray alloc] initWithCapacity: 10] id array = objc_msgSend(nsmutablearray, sel_registerName("alloc")); id arrayAfterInit = objc_msgSend(array, sel_registerName("initWithCapacity:"), 10); // Alternative, shorthand way of creating an NSMutableArray, // equivalent to [NSMutableArray arrayWithCapacity: 10] //id arrayAfterInit = objc_msgSend(nsmutablearray, sel_registerName("arrayWithCapacity:"), 10); // Add an NSString and the nsma class reference to the array objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"test"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), nsmutablearray); // Print out the length and debug printout NSLog(@"%d", objc_msgSend(arrayAfterInit, sel_registerName("count"))); NSLog(@"%@", arrayAfterInit); } return 0;}2、Block
（一）
#import <Foundation/Foundation.h>#include <objc/runtime.h>#include <Block.h>#include <dlfcn.h>#include <stdio.h> int main() { void *sdl_library = dlopen("/System/Library/Frameworks/Foundation.framework/Versions/Current/Foundation", RTLD_LAZY); if (sdl_library == NULL) { printf("Got dlopen error!\n"); } else { printf("dlopen successful!\n"); // Set up an NSAutoreleasePool Class nsautoreleasepool = objc_getClass("NSAutoreleasePool"); id pool = class_createInstance(nsautoreleasepool, 0); SEL initSel = sel_registerName("init"); id poolAfterInit = objc_msgSend(pool, initSel); // Create an NSMutableArray Class nsmutablearray = objc_getClass("NSMutableArray"); // Regular way to create an NSMutableArray, // equivalent to [[NSMutableArray alloc] initWithCapacity: 10] id array = objc_msgSend(nsmutablearray, sel_registerName("alloc")); id arrayAfterInit = objc_msgSend(array, sel_registerName("initWithCapacity:"), 10); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"a"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"b"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"c"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"d"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"e"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"f"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"g"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"h"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"i"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"j"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"k"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"l"); id b = ^(id x, NSUInteger index, BOOL *stop){ NSLog(@"%@", x); }; NSLog(@"%@", b); objc_msgSend(arrayAfterInit, sel_registerName("enumerateObjectsUsingBlock:"), b); } return 0;}
（二）
#import <Foundation/Foundation.h>#include <objc/runtime.h>#include <Block.h>#include <dlfcn.h>#include <stdio.h> struct __block_literal_1 { void *isa; int flags; int reserved; void (*invoke)(struct __block_literal_1 *, id obj, NSUInteger idx, BOOL *stop); struct __block_descriptor_1 *descriptor;}; // This is the regular C function we are turning into a Block.void __block_invoke_1(struct __block_literal_1 *_block, id obj, NSUInteger idx, BOOL *stop) { NSLog(@"%d: %@", idx, obj);} static struct __block_descriptor_1 { unsigned long int reserved; unsigned long int Block_size;} __block_descriptor_1 = { 0, sizeof(struct __block_literal_1) }; int main() { printf("sizeof(int): %lu\n", sizeof(int)); printf("sizeof(void *): %lu\n", sizeof(void *)); printf("sizeof(void (*)()): %lu\n", sizeof(void (*)())); printf("sizeof(struct __block_descriptor *): %lu\n", sizeof(struct __block_descriptor *)); printf("sizeof(__block_literal_1): %lu\n", sizeof(struct __block_literal_1)); printf("sizeof(__block_descriptor_1): %lu\n", sizeof(struct __block_descriptor_1)); printf(" calculated: %lu\n", sizeof(void*)+sizeof(int)+sizeof(int)+sizeof(void (*)())+sizeof(struct __block_descriptor_1 *)); void *sdl_library = dlopen("/System/Library/Frameworks/Foundation.framework/Versions/Current/Foundation", RTLD_LAZY); if (sdl_library == NULL) { printf("Got dlopen error!\n"); } else { printf("dlopen successful!\n"); // Set up an NSAutoreleasePool Class nsautoreleasepool = objc_getClass("NSAutoreleasePool"); id pool = class_createInstance(nsautoreleasepool, 0); SEL initSel = sel_registerName("init"); id poolAfterInit = objc_msgSend(pool, initSel); // Create an NSMutableArray Class nsmutablearray = objc_getClass("NSMutableArray"); // Regular way to create an NSMutableArray, // equivalent to [[NSMutableArray alloc] initWithCapacity: 10] id array = objc_msgSend(nsmutablearray, sel_registerName("alloc")); id arrayAfterInit = objc_msgSend(array, sel_registerName("initWithCapacity:"), 10); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"a"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"b"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"c"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"d"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"e"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"f"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"g"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"h"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"i"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"j"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"k"); objc_msgSend(arrayAfterInit, sel_registerName("addObject:"), @"l"); struct __block_literal_1 _block_literal = { &_NSConcreteStackBlock, //&_NSConcreteGlobalBlock, (1<<29), 0, __block_invoke_1, &__block_descriptor_1 }; id b = (id)&_block_literal; NSLog(@"%@", b); objc_msgSend(arrayAfterInit, sel_registerName("enumerateObjectsUsingBlock:"), b); } return 0;}
3、打印Class详情
#include <objc/runtime.h>#include <dlfcn.h>#include <stdio.h> int main(int argc, char **argv) { dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", RTLD_LAZY); dlopen("/System/Library/Frameworks/AppKit.framework/AppKit", RTLD_LAZY); dlopen("/System/Library/Frameworks/Cocoa.framework/Cocoa", RTLD_LAZY); char * className = argc == 2 ? argv[1] : "NSMutableArray"; Class NSMA = objc_getClass(className); if (!NSMA) { printf("Could not load Class: %s\n", className); return 1; } const char *name = class_getName(NSMA); printf("class_getName: %s\n", name); int version = class_getVersion(NSMA); printf("class_getVersion: %d\n", version); const char *weakIvarLayout = class_getWeakIvarLayout(NSMA); printf("class_getWeakIvarLayout: %s\n", weakIvarLayout); BOOL isMetaClass = class_isMetaClass(NSMA); printf("class_isMetaClass: %s\n", isMetaClass ? "yes" : "no"); // get the metaclass id metaclass = NSMA->isa; isMetaClass = class_isMetaClass(metaclass); printf("class_isMetaClass(isa): %s\n", isMetaClass ? "yes" : "no"); // Look up the Ivars unsigned int i = 0; unsigned int numIvars = 999999; Ivar *ivars = NULL; ivars = class_copyIvarList(NSMA, &numIvars); printf("\nNum ivars: %d\n", numIvars); for (; i<numIvars; i++) { Ivar ivar = ivars[i]; const char *ivarName = ivar_getName(ivar); printf(" %s (%s)\n", ivarName, ivar_getTypeEncoding(ivar)); } free(ivars); // Copy the Property List unsigned int numProps = 999999; objc_property_t *props = NULL; props = class_copyPropertyList(NSMA, &numProps); printf("\nNum props: %d\n", numProps); for (i=0; i<numProps; i++) { } free(props); // Copy Protocol List unsigned int numProtocols = 9999999; Protocol **ps = class_copyProtocolList(NSMA, &numProtocols); printf("\nNum Protocols: %d\n", numProtocols); for (i=0; i<numProtocols; i++) { Protocol *p = ps[i]; printf(" %s\n", protocol_getName(p)); } free(ps); // Copy Method List (instance methods) unsigned int numMethods = 99999999; Method * methods = NULL; methods = class_copyMethodList(NSMA, &numMethods); printf("\nNum Instance Methods: %d\n", numMethods); for (i=0; i<numMethods; i++) { Method m = methods[i]; SEL name = method_getName(m); printf(" %s (%s)\n", sel_getName(name), method_getTypeEncoding(m)); } free(methods); // Copy Method List (class methods) numMethods = 0; methods = NULL; methods = class_copyMethodList(metaclass, &numMethods); printf("\nNum Class Methods: %d\n", numMethods); for (i=0; i<numMethods; i++) { Method m = methods[i]; SEL name = method_getName(m); printf(" %s (%s)\n", sel_getName(name), method_getTypeEncoding(m)); } free(methods); // get superclass Class superclass = NSMA; printf("\nWalking inheritance chain:\n"); printf(" %s\n", name); unsigned int numClasses = 0; do { printf(" "); numClasses++; superclass = class_getSuperclass(superclass); for (i=0; i<numClasses; i++) { printf(" "); } printf("↳ %s\n", class_getName(superclass)); } while(superclass); return 0;}4、打印所有协议
#include <objc/runtime.h>#include <dlfcn.h>#include <stdio.h> int main(int argc, char **argv) { dlopen("/System/Library/Frameworks/Foundation.framework/Versions/Current/Foundation", RTLD_LAZY); unsigned int i, n; Protocol **ps = NULL; ps = objc_copyProtocolList(&n); printf("Num Protocols: %d\n", n); // Do stuff with `classes` for (i=0; i<n; i++) { Protocol *p = ps[i]; printf("%s\n", protocol_getName(p)); } free(ps); return 0;}5、获取某个framework的所有class
#import <Foundation/Foundation.h>#include <objc/runtime.h>#include <dlfcn.h>#include <stdio.h> int main(int argc, char **argv) { dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", RTLD_LAZY); dlopen("/System/Library/Frameworks/AppKit.framework/AppKit", RTLD_LAZY); int i = 0; int numClasses; Class * classes = NULL; numClasses = objc_getClassList(NULL, 0); printf("Num classes: %d\n", numClasses); if (numClasses > 0 ) { classes = malloc(sizeof(Class) * numClasses); numClasses = objc_getClassList(classes, numClasses); // Do stuff with `classes` for (i=0; i<numClasses; i++) { Class c = classes[i]; printf("%s\n", class_getName(c)); } free(classes); } return 0;}6、HelloWorld
#include <objc/runtime.h>#include <dlfcn.h>#include <stdio.h> int main() { void *sdl_library = dlopen("/System/Library/Frameworks/Foundation.framework/Versions/Current/Foundation", RTLD_LAZY); if (sdl_library == NULL) { printf("Got dlopen error!\n"); } else { printf("dlopen successful!\n"); // Set up an NSAutoreleasePool Class nsautoreleasepool = objc_getClass("NSAutoreleasePool"); id pool = class_createInstance(nsautoreleasepool, 0); SEL initSel = sel_registerName("init"); id poolAfterInit = objc_msgSend(pool, initSel); // Set up a NSString with the contents "Hello World" from a C string Class nsstring = objc_getClass("NSString"); SEL stringUTF8sel = sel_registerName("stringWithUTF8String:"); id hello = objc_msgSend(nsstring, stringUTF8sel, "Hello World\n"); // Print it back out as a C string printf("%s", (char *)objc_msgSend(hello, sel_registerName("UTF8String"))); } return 0;}
7、获取size
#include <objc/runtime.h>#include <dlfcn.h>#include <stdio.h> int main(int argc, char **argv) { dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", RTLD_LAZY); dlopen("/System/Library/Frameworks/AppKit.framework/AppKit", RTLD_LAZY); dlopen("/System/Library/Frameworks/Cocoa.framework/Cocoa", RTLD_LAZY); char * className = argc == 2 ? argv[1] : "NSMutableArray"; Class NSMA = objc_getClass(className); if (!NSMA) { printf("Could not load Class: %s\n", className); return 1; } const char *name = class_getName(NSMA); printf("class_getName: %s\n", name); int version = class_getVersion(NSMA); printf("class_getVersion: %d\n", version); const char *weakIvarLayout = class_getWeakIvarLayout(NSMA); printf("class_getWeakIvarLayout: %s\n", weakIvarLayout); BOOL isMetaClass = class_isMetaClass(NSMA); printf("class_isMetaClass: %s\n", isMetaClass ? "yes" : "no"); // get the metaclass id metaclass = NSMA->isa; isMetaClass = class_isMetaClass(metaclass); printf("class_isMetaClass(isa): %s\n", isMetaClass ? "yes" : "no"); // Look up the Ivars unsigned int i = 0; unsigned int numIvars = 999999; Ivar *ivars = NULL; ivars = class_copyIvarList(NSMA, &numIvars); printf("\nNum ivars: %d\n", numIvars); for (; i<numIvars; i++) { Ivar ivar = ivars[i]; const char *ivarName = ivar_getName(ivar); printf(" %s (%s)\n", ivarName, ivar_getTypeEncoding(ivar)); } free(ivars); // Copy the Property List unsigned int numProps = 999999; objc_property_t *props = NULL; props = class_copyPropertyList(NSMA, &numProps); printf("\nNum props: %d\n", numProps); for (i=0; i<numProps; i++) { } free(props); // Copy Protocol List unsigned int numProtocols = 9999999; Protocol **ps = class_copyProtocolList(NSMA, &numProtocols); printf("\nNum Protocols: %d\n", numProtocols); for (i=0; i<numProtocols; i++) { Protocol *p = ps[i]; printf(" %s\n", protocol_getName(p)); } free(ps); // Copy Method List (instance methods) unsigned int numMethods = 99999999; Method * methods = NULL; methods = class_copyMethodList(NSMA, &numMethods); printf("\nNum Instance Methods: %d\n", numMethods); for (i=0; i<numMethods; i++) { Method m = methods[i]; SEL name = method_getName(m); printf(" %s (%s)\n", sel_getName(name), method_getTypeEncoding(m)); } free(methods); // Copy Method List (class methods) numMethods = 0; methods = NULL; methods = class_copyMethodList(metaclass, &numMethods); printf("\nNum Class Methods: %d\n", numMethods); for (i=0; i<numMethods; i++) { Method m = methods[i]; SEL name = method_getName(m); printf(" %s (%s)\n", sel_getName(name), method_getTypeEncoding(m)); } free(methods); // get superclass Class superclass = NSMA; printf("\nWalking inheritance chain:\n"); printf(" %s\n", name); unsigned int numClasses = 0; do { printf(" "); numClasses++; superclass = class_getSuperclass(superclass); for (i=0; i<numClasses; i++) { printf(" "); } printf("↳ %s\n", class_getName(superclass)); } while(superclass); return 0;}#import <Foundation/Foundation.h>#include <objc/runtime.h>#include <dlfcn.h>#include <stdio.h>int main() { void *sdl_library = dlopen("/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation", RTLD_LAZY); if (sdl_library == NULL) { printf("Got dlopen error!\n"); } else { printf("dlopen successful!\n"); } printf("sizeof(Class): %lu\n", sizeof(Class)); printf("sizeof(Method): %lu\n", sizeof(Method)); printf("sizeof(unsigned long int): %lu\n", sizeof(unsigned long int)); printf("sizeof(struct int, void*): %lu\n", sizeof(struct test { int test; void * ptr; })); printf("sizeof(struct int, int, void*): %lu\n", sizeof(struct test2 { int test; int test2; void * ptr; })); printf("sizeof(struct void*, int, int, void*): %lu\n", sizeof(struct test3 { void *ptr2; int test2; void * ptr; })); return 0;}8、捕获异常
#include <objc/runtime.h>#include <objc/objc-exception.h>#include <dlfcn.h>#include <stdio.h> void uncaughtExceptionHandler (id exception) { fprintf(stderr, "Inside uncaughtException handler!!!!\n"); fprintf(stderr, "Exception Type: %s\n", (const char *)objc_msgSend(objc_msgSend(exception, sel_registerName("name")), sel_registerName("UTF8String"))); fprintf(stderr, "Exception Reason: %s\n", (const char *)objc_msgSend(objc_msgSend(exception, sel_registerName("reason")), sel_registerName("UTF8String")));} int main() { void *sdl_library = dlopen("/System/Library/Frameworks/Foundation.framework/Versions/Current/Foundation", RTLD_LAZY); if (sdl_library == NULL) { printf("Got dlopen error!\n"); } else { printf("dlopen successful!\n"); // Set up an NSAutoreleasePool Class nsautoreleasepool = objc_getClass("NSAutoreleasePool"); id pool = class_createInstance(nsautoreleasepool, 0); SEL initSel = sel_registerName("init"); id poolAfterInit = objc_msgSend(pool, initSel); // Set up an uncaughtException handler objc_setUncaughtExceptionHandler((objc_uncaught_exception_handler)uncaughtExceptionHandler); // Intentionally throw an exception, by sending a bad selector to an object Class nsobject = objc_getClass("NSObject"); SEL badSel = sel_registerName("badSelector"); objc_msgSend(nsobject, badSel); } return 0;}9、设备当前运行的进程
- (NSArray *)runningProcesses { int mib[4] = {CTL_KERN,KERN_PROC, KERN_PROC_ALL, 0}; size_t miblen = 4; size_t size; int st = sysctl(mib, miblen,NULL, &size, NULL, 0); struct kinfo_proc * process =NULL; struct kinfo_proc * newprocess =NULL; do { size += size / 10; newprocess = realloc(process, size); if (!newprocess){ if (process){ free(process); } return nil; } process = newprocess; st = sysctl(mib, miblen, process, &size,NULL, 0); } while (st == -1 &&errno == ENOMEM); if (st == 0){ if (size % sizeof(structkinfo_proc) == 0){ int nprocess = size / sizeof(struct kinfo_proc); if (nprocess){ NSMutableArray * array = [[NSMutableArrayalloc] init]; for (int i = nprocess -1; i >= 0; i--){ NSString * processID = [[NSStringalloc] initWithFormat:@"%d", process[i].kp_proc.p_pid]; NSString * processName = [[NSStringalloc] initWithFormat:@"%s", process[i].kp_proc.p_comm]; NSDictionary * dict = [[NSDictionaryalloc] initWithObjects:[NSArrayarrayWithObjects:processID, processName, nil] forKeys:[NSArray arrayWithObjects:@"ProcessID", @"ProcessName",nil]]; [processID release]; [processName release]; [array addObject:dict]; [dict release]; } free(process); return [array autorelease]; } } } return nil;}// 当前运行的进程 NSArray * processes = [selfrunningProcesses]; for (NSDictionary * dictin processes){ NSLog(@"%@ - %@", [dictobjectForKey:@"ProcessID"], [dictobjectForKey:@"ProcessName"]); }- IOS高级开发～底层实现资源收集
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