有关 main(int argc,char** argv) 的问题

laiwing 2008-07-26 02:56:37



class stack

{..

};



int main(int argc,char** argv)

{

	char buf[100];

	stack textlines;



	FILE* file = fopen(argv[1],"r");	

        while (fgets(buf,100,file))

	{

		char* string = (char*)malloc(100);

		strcpy(string,buf);

		textlines.push(string);

	}



	char* s;

	while ( (s = (char*)textlines.pop() ) != 0)

	{

		wprintf(L"&s",s);

		free(s);

	}

}

FILE* file = fopen(argv[1],"r");
这是什么意思？？自己读自己的档案？？？

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jerrykinki 2008-07-26

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“要是我直接打开该文挡 1.exe 程序就会意常中止”
当然会这样！

直接运行
while (fgets(buf,100,file))
{
char* string = (char*)malloc(100);
strcpy(string,buf);
textlines.push(string);
}会出现异常。
应该在FILE* file = fopen(argv[1],"r");之后判断文件打开是不是成功？

laiwing 2008-07-26

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要是我直接打开该文挡 1.exe 程序就会意常中止

在编译时候，同时也有警告信息，

c:\users\john\desktop\thinking in c++\4\2.cpp(73) : warning C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
1> c:\program files\microsoft visual studio 9.0\vc\include\stdio.h(237) : 請參閱 'fopen' 的宣告

1>c:\users\john\desktop\thinking in c++\4\2.cpp(77) : warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
1> c:\program files\microsoft visual studio 9.0\vc\include\string.h(74) : 請參閱 'strcpy' 的宣告

这是我的形程序码



#include <iostream>

#include <stdlib.h>

#include <stdio.h>

using namespace std;



class stack

{

	struct link

	{

		void* date;

		link* next;

		void initialize (void* const Date,link* const Next) { date = Date;next = Next;}

	} *head;

public:

	stack() { head = 0 ; }

	~stack();

	void push (void* const Date);

        void* const peek()const { return head->date ; }

        void* const pop();

};





void stack::push(void* const Date)

{

	link* newlink = (link*)malloc(sizeof(link));

	newlink->initialize(Date,head);

	head = newlink;

}



void* const stack::pop()

{

	if ( head == 0 )

		return 0;

	link* temp = head;

	void* result = head->date;

	head = head->next;

	free(temp);

	return result;

}



stack::~stack()

{

	link *temp = head;

	while ( temp != 0 )

	{

		head = head->next;

		free(head->date);

		free(head);

	}

}



int main(int argc,char* argv[])

{

	char buf[100];

	stack textlines;



	FILE* file = fopen(argv[1],"r");

	while (fgets(buf,100,file))

	{

		char* string = (char*)malloc(strlen(buf)+1);

		strcpy(string,buf);

		textlines.push(string);

	}



	char* s;

	while ( (s = (char*)textlines.pop() ) != 0)

	{

		printf("%s",s);

		free(s);

	}

}