问题描述
我得到一个 CFStringRef
出的 CFDictionaryRef
使用 CFDictionaryGetValue
。
我一直在试图将 CFStringRef
转换为的char *
使用 CFStringGetCString
或 CFStringGetCStringPtr
,他们要么返回null或崩溃。
有没有办法做到这一点?怎么样?
感谢您。
编辑:样品code:
SecStatic codeREF静态code;
CFDictionaryRef信息;
SecCSFlags标志= kSecCSInternalInformation
| kSecCSSigningInformation
| kSecCSRequirementInformation
| kSecCSInternalInformation;
CFURLRef pathURL = NULL;
CFStringRef pathStr = NULL;
CFStringRef UNIQUEID;
字符*海峡= NULL;
CFIndex长度;
pathStr = CFStringCreateWithCString(kCFAllocatorDefault,
文件名,kCFStringEncodingUTF8);
pathURL = CFURLCreateWithString(kCFAllocatorDefault,pathStr,NULL);
SecStatic codeCreateWithPath(pathURL,kSecCSDefaultFlags,&安培;静态code);
秒codeCopySigningInformation(静态code,标志和安培;信息);UNIQUEID =(CFStringRef)CFDictionaryGetValue(信息,昆船codeInfoUnique);//我怎么在这里将其转换为char *?
长度= CFStringGetLength(UNIQUEID);
海峡=(字符*)malloc的(长+ 1);
CFStringGetCString(UNIQUEID,STR,长度,kCFStringEncodingUTF8);的printf(签名哈希为%s \\ n,STR);CFRelease(信息);
CFRelease(静态code);
从第17章在
的char * MYCFStringCopyUTF8String(CFStringRef ASTRING){
如果(ASTRING == NULL){
返回NULL;
} CFIndex长度= CFStringGetLength(ASTRING);
CFIndex MAXSIZE =
CFStringGetMaximumSizeForEncoding(长度,kCFStringEncodingUTF8)+ 1;
字符*缓冲=(字符*)malloc的(MAXSIZE);
如果(CFStringGetCString(ASTRING,缓冲,MAXSIZE,
kCFStringEncodingUTF8)){
返回缓冲区;
}
返回NULL;
}
生成的缓冲区必须始终被释放(这就是为什么复制
是名称)。链接的例子code也有一个使用你提供缓冲稍快的版本。
I am getting a CFStringRef
out of a CFDictionaryRef
using CFDictionaryGetValue
.
I've been trying to convert the CFStringRef
to a char*
using CFStringGetCString
or CFStringGetCStringPtr
and they either return a NULL or it crashes.
Is there a way to do this? How?
Thank you.
EDIT: sample code:
SecStaticCodeRef staticCode;
CFDictionaryRef information;
SecCSFlags flags = kSecCSInternalInformation
| kSecCSSigningInformation
| kSecCSRequirementInformation
| kSecCSInternalInformation;
CFURLRef pathURL = NULL;
CFStringRef pathStr = NULL;
CFStringRef uniqueid;
char* str = NULL;
CFIndex length;
pathStr = CFStringCreateWithCString(kCFAllocatorDefault,
filename, kCFStringEncodingUTF8);
pathURL = CFURLCreateWithString(kCFAllocatorDefault, pathStr, NULL);
SecStaticCodeCreateWithPath(pathURL, kSecCSDefaultFlags, &staticCode);
SecCodeCopySigningInformation(staticCode, flags, &information);
uniqueid = (CFStringRef) CFDictionaryGetValue(information, kSecCodeInfoUnique);
// how do I convert it here to char *?
length = CFStringGetLength(uniqueid);
str = (char *)malloc( length + 1 );
CFStringGetCString(uniqueid, str, length, kCFStringEncodingUTF8);
printf("hash of signature is %s\n", str);
CFRelease(information);
CFRelease(staticCode);
From the Chapter 17 example code in iOS:PTL.
char * MYCFStringCopyUTF8String(CFStringRef aString) {
if (aString == NULL) {
return NULL;
}
CFIndex length = CFStringGetLength(aString);
CFIndex maxSize =
CFStringGetMaximumSizeForEncoding(length, kCFStringEncodingUTF8) + 1;
char *buffer = (char *)malloc(maxSize);
if (CFStringGetCString(aString, buffer, maxSize,
kCFStringEncodingUTF8)) {
return buffer;
}
return NULL;
}
The resulting buffer must always be freed (which is why Copy
is in the name). The linked example code also has a slightly faster version that uses a buffer you provide.
这篇关于转换一个CFStringRef为char *的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!