Visual Studio上的C ++错误：“Windows触发了断点” [英] C++ error on Ms Visual Studio: “Windows has triggered a breakpoint"

问题描述

大家好，



我想在目录中提取所有3克（每个3克包含3个字节，每次移位1个字节）的文件文件中每3克的频率。我编写了一个简单的C ++程序，以递归方式提取3克二进制文件，并将它们作为密钥保存在哈希表中。

我添加每个键之前我找到了键。如果它在堆中我没有添加这个键，只是增加成员值（存在频率3gram）。



程序运行但是它停止并显示错误消息windows已经在我的程序中触发了一个断点。这可能是由于堆的损坏导致程序中的错误或它加载的dll



如果有人能帮助我，我将不胜感激..



谢谢，



<前lang = c ++> #include hash_table.h
#include < 字符串 >
#include < windows.h >
#include < fstream >
#include < stdio.h >
#include < iostream >

#define MAX_BUFFER_SIZE 256
typedef CHashTable< int> CLongHashT;

使用 命名空间标准;

void makeVocabHash（string dir，CLongHashT HashTperAll， int N）{
/ * N - > N元！ * /
HANDLE hFindFile;
WIN32_FIND_DATAA Win32FindData;
CHAR目录[MAX_PATH];
int counter;
int countNgram;
int i;
string tmp;

fstream fileOpen;

// 复制目录路径
sprintf（目录， ％s \\ *。*，& dir [ 0 ]）;
if （（hFindFile = FindFirstFileA（Directory，& Win32FindData））== INVALID_HANDLE_VALUE）{ // 如果找不到目录（查找目录的第一个文件）
return ; // 错误，找不到目录
}

do {
if （strcmp（Win32FindData.cFileName， 。）！= 0 && strcmp（Win32FindData.cFileName，< span class =code-string> ..）！= 0 ） {
sprintf（目录， ％s \\％s，& dir [ 0 ]，Win32FindData.cFileName）;


// 如果找到文件
if （！（Win32FindData.dwFileAttributes& FILE_ATTRIBUTE_DIRECTORY））{
// 是一个文件
fileOpen.open（目录，ios :: 在 | ios :: binary | ios中： ：吃）;

// 文件大小
int end = fileOpen.tellg（）;
fileOpen.seekg（ 0 ，ios :: beg）;
int begin = fileOpen.tellg（）;
int size = end - begin;
char 数据[MAX_BUFFER_SIZE];

fileOpen.read（& data [ 0 ]，size）;
fileOpen.close（）;

counter = 0 ;
// 读取N个字节的数据，构造3克并插入hashT
while （（counter！=（（size-N）+ 1 ）））{
for （i = 0 ; i！= N; ++ i）
tmp + = data [i + counter];

// insert to hashT
if （HashTperAll.GetMember（tmp））
countNgram = *（HashTperAll.GetMember（tmp））+ 1 ;
else
countNgram = 1 ;

HashTperAll.AddKey（tmp，& countNgram）;
tmp = ;
counter ++;
}

}
其他 {
// 是一个目录
makeVocabHash（Directory，HashTperAll，N）;
}
}
} while （FindNextFileA（hFindFile，& Win32FindData））; // 在目录中查找下一个文件

// 关闭句柄
FindClose（hFindFile）;
}
// --------------- -------------------------------------------------- ----
void main（）
{
CLongHashT HashTDocs;

cout<< 输入路径;
string dir;
cin>> DIR;
makeVocabHash（dir，HashTDocs， 3 ）;

}

解决方案

问题可能在这里：

  char  data [MAX_BUFFER_SIZE]; 
 
 fileOpen.read（& data [ 0 ]，尺寸）; 

当文件大小大于

 MAX_BUFFER_SIZE< br /> 

时，这会导致缓冲区溢出。

为避免这种情况，请在堆使用 new 或 malloc ：

  char  data =  new   char  [size]; 
 fileOpen.read（& data [ 0 ]，size）; 
  //  在此处执行数据 
 删除数据; 

Hi all,

I want to extract all 3 grams(each 3 gram contain 3 byte with 1 byte shift each time) of files in a directory and count frequency of each 3 gram in files. I have written a simple C++ program to extract 3 grams of binary files recursively and saved them in a hash table as a key.
before I add each key I find key. if it was in heap I did not add this key and just increase member value(frequency of presence 3gram).

The program runs but it stops with an error message saying "windows has triggered a break point in my program.This may be due to the corruption of the heap which indicated a bug in the program or the dlls that it loads"

I would appreciate it if somebody could help me ..

Thanks,

#include "hash_table.h"
#include <string>
#include <windows.h>
#include <fstream>
#include <stdio.h>
#include <iostream>

#define MAX_BUFFER_SIZE 256
typedef CHashTable<int> CLongHashT;

using namespace std;

void makeVocabHash(string dir, CLongHashT HashTperAll, int N) {
	/* N -> N-gram! */
	HANDLE		  hFindFile;
	WIN32_FIND_DATAA  Win32FindData;
	CHAR	        Directory[MAX_PATH];
	int counter;
        int countNgram;
	int  i;
	string tmp;

	fstream fileOpen;

	// copying path to directory
	sprintf(Directory,"%s\\*.*", &dir[0]);
      if((hFindFile = FindFirstFileA(Directory, &Win32FindData)) == INVALID_HANDLE_VALUE){ // if   directory not found (finding first file of directory)
		return ; // error, directory not found
	}

do{
if(strcmp(Win32FindData.cFileName, ".") != 0 && strcmp(Win32FindData.cFileName, "..") != 0){
sprintf(Directory, "%s\\%s", &dir[0], Win32FindData.cFileName);


        // if found a file
        if(! (Win32FindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ) {
	// is a file
	fileOpen.open(Directory, ios::in | ios::binary | ios::ate);

	//size of file
	int end = fileOpen.tellg();
	fileOpen.seekg (0, ios::beg);
	int begin = fileOpen.tellg();
	int size = end - begin;
	char data[MAX_BUFFER_SIZE];

	fileOpen.read(&data[0], size);
	fileOpen.close();

	counter = 0;
	// reading data with N bytes, construct 3 grams and insert to hashT
    while(  (counter !=  ((size - N) + 1) ) ) {
	for( i=0; i!=N; ++i) 
		tmp += data[i+counter];

		// insert to hashT
		if (HashTperAll.GetMember(tmp))
		   countNgram = *(HashTperAll.GetMember(tmp)) + 1;
		else
		    countNgram = 1;
		
                HashTperAll.AddKey(tmp, &countNgram );
		tmp = "";
		counter++;
		}
			
	}
	else {
		// is a directory
		makeVocabHash(Directory, HashTperAll, N);
	}
		}
} while(FindNextFileA(hFindFile,&Win32FindData));//finding next file in directory

	// closing handles
	FindClose(hFindFile);
}
//---------------------------------------------------------------------
void main()
{
   CLongHashT HashTDocs;

   cout<< "enter a path";
   string dir;
   cin>> dir;
   makeVocabHash(dir,HashTDocs, 3);

}

解决方案

The problem may be located here:

char data[MAX_BUFFER_SIZE];

fileOpen.read(&data[0], size);

This results in a buffer overflow when your file size is greater than

MAX_BUFFER_SIZE<br />

.
To avoid this, allocate the buffer on the heap using new or malloc:

char data = new char[size];
fileOpen.read(&data[0], size);
// Do something with data here
delete data;

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