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问题描述
代码:
我有一些文件编写代码工作正常,但打印错误在调试模式,没有输出错误。 strong> #include< iostream> #include< string> #include< fstream> #include< sstream> using namespace std; int main(int argc,char * const argv []){ string cppfilename; std :: cout<< 请输入要创建的文件名:; while(cppfilename ==){ getline(cin,cppfilename); //错误出现在这里} cppfilename + =.txt; ofstream fileout; fileout.open(cppfilename.c_str()); fileout< 将此文件写入file.\\\; fileout.close(); return 0; }调试输出:
请输入要创建的文件名:运行... myfile FileIO(5403)malloc:***错误对象0xb3e8:指针被释放 ***在malloc_error_break中设置断点以调试创建:myfile.txt发布输出:
FileIO实现C ++ 输入要创建的文件名:Running ... myfile 创建:myfile.txt除了不检查文件描述符是否打开(为了简单)这个代码有什么问题?
更新:下面的代码仍然存在错误:
string cppfilename; getline(cin,cppfilename); //错误在这里解决方案
这看起来是另一种情况 _GLIBCXX_DEBUG在Mac OS X上使用gcc 4.2中断。
您最好的选择是删除_GLIBCXX_DEBUG或切换到gcc 4.0。
I have some file writing code that works as expected, but prints an error on Debug mode, no output errors in Release.
Code:
#include <iostream> #include <string> #include <fstream> #include <sstream> using namespace std; int main (int argc, char * const argv[]) { string cppfilename; std::cout << "Please enter the filename to create: "; while ( cppfilename == "" ) { getline(cin, cppfilename); // error occurs here } cppfilename += ".txt"; ofstream fileout; fileout.open( cppfilename.c_str() ); fileout << "Writing this to a file.\n"; fileout.close(); return 0; }Debug Output:
Please enter the filename to create: Running… myfile FileIO(5403) malloc: *** error for object 0xb3e8: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug Created: myfile.txtRelease Output:
FileIO implementation C++ Please enter the filename to create: Running… myfile Created: myfile.txtAside from not checking for the file descriptor being open (for simplicity) what is wrong with this code?
Update: I broke the code down to the following and it still errors:
string cppfilename; getline(cin, cppfilename); // error here解决方案
This looks to be another case of _GLIBCXX_DEBUG being broken with gcc 4.2 on Mac OS X.
Your best options look to be to drop _GLIBCXX_DEBUG or to switch to gcc 4.0.
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Xcode STL C ++ Debug编译错误
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