链接静态 C++ 时 Objective-C 中的损坏符号表图书馆
我有一个用 C++ 编写的名为 options 的类,这是标题信息:
class Options {
public:
string filename;
string chunkDir;
string outFilename;
string inFilename;
BOOL compress;
BOOL extract;
BOOL print;
BOOL reconstruct;
int bits;
Options(string inFilename);
Options(int argc, char** argv);
void unsupported(string s);
void setOptionsFromArguments(int argc, char** argv);
void validateOptionCombination();
int getBits() {
return bits
};
};
在 Objective-C 部分中,我像这样初始化选项:
Options *opts=new Options([fileName cStringUsingEncoding:NSUTF8StringEncoding]);
现在发生的情况是,如果我将指针传递给另一个 C++ 方法,它可以正常工作,但如果我实际上尝试使用例如
opts- 访问 Objective C 端中的任何内容, >位 或者 opts->getBits()
它总是返回 print 的整数值
看起来符号表在 Objective-C 和 C++ 端之间被破坏了,但我不知道我可以做什么来导致这种情况。
如果我为 Mac 进行编译,该代码甚至可以与 Objective-C++ 一起使用,并且只要 C++ 调用 C++,它似乎就可以工作,所以它不像内存被损坏,它只是看起来像符号表问题。
任何见解将不胜感激。
I have a class called options written in c++, here is the header info:
class Options {
public:
string filename;
string chunkDir;
string outFilename;
string inFilename;
BOOL compress;
BOOL extract;
BOOL print;
BOOL reconstruct;
int bits;
Options(string inFilename);
Options(int argc, char** argv);
void unsupported(string s);
void setOptionsFromArguments(int argc, char** argv);
void validateOptionCombination();
int getBits() {
return bits
};
};
In the objective-c section, I initialize Options like this:
Options *opts=new Options([fileName cStringUsingEncoding:NSUTF8StringEncoding]);
Now what happens is that if I pass the pointer to another C++ method it works fine, but if I actually try to access anything in the objective c side using, for example
opts->bits
or
opts->getBits()
It always returns the integer value for print
It looks like somehow the symbol table is getting mangled between the objective-c and C++ side, but I have no idea what I could have done to do cause this.
The code works even with Objective-C++ if I compile for the mac, and as long as C++ is calling C++ it seems to work so it's not like the memory is getting corrupted, it just looks like a symbol table issue.
Any insight would be much appreciated.
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在 Objective-C 中,
BOOL
是signed char
的类型定义。编译纯 C++ 时使用什么定义?如果不同,您会遇到各种奇怪的情况,因为 C++ 代码和 Objective-C++ 代码在成员变量的大小或布局上不一致。In Objective-C,
BOOL
is a typedef tosigned char
. What definition are you using when compiling pure C++? If it's different, you'll get all sorts of weirdness, because the C++ code and the Objective-C++ code won't agree on the size or layout of the member variables.