c++ - 将字节附加到 Visual C++ 中的二进制文件

Question

我正在尝试将一些字节附加到 Visual C++ 中的二进制文件

// ConsoleApplication1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <windows.h>
#include <tlhelp32.h>
#include <tchar.h>
#include <iostream>
#include <string>

//  Forward declarations:
void append(LPCTSTR);

int main()
{
    LPCTSTR fn = L"C:/kaiyin/kybig.out"; 
    append(fn);

    printf("hello world\n");
    std::string s = "";
    std::getline(std::cin, s);
    return 0;
}

void append(LPCTSTR filename) {
    LARGE_INTEGER size;
    size.QuadPart = 0;
    HANDLE fh = CreateFile(filename, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    GetFileSizeEx(fh, &size);
    LPCVOID buf = "abc";
    SetFilePointerEx(fh, size, NULL, FILE_BEGIN);
    WriteFileEx(fh, buf, 3, NULL, NULL);
    CloseHandle(fh);
}

我得到一个错误:

First-chance exception at 0x76AB8833 (KernelBase.dll) in ConsoleApplication1.exe: 0xC0000005: Access violation reading location 0x00000008.

If there is a handler for this exception, the program may be safely continued.

出了什么问题？

---

更新

如果我在没有调试的情况下运行它，我会得到这样的崩溃报告:

Problem signature:
  Problem Event Name:   APPCRASH
  Application Name: ConsoleApplication1.exe
  Application Version:  0.0.0.0
  Application Timestamp:    560255b2
  Fault Module Name:    KERNELBASE.dll
  Fault Module Version: 6.3.9600.17415
  Fault Module Timestamp:   54504ade
  Exception Code:   c0000005
  Exception Offset: 000b8833
  OS Version:   6.3.9600.2.0.0.256.48
  Locale ID:    1033
  Additional Information 1: 5861
  Additional Information 2: 5861822e1919d7c014bbb064c64908b2
  Additional Information 3: a10f
  Additional Information 4: a10ff7d2bb2516fdc753f9c34fc3b069

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Answer 1

基于 WriteFileEx 文件句柄的 msdn 网站，使用的文件句柄可以是使用 FILE_FLAG_OVERLAPPED 标志打开的任何内容(在您的代码中不是这种情况)。 将此函数更改为 WriteFile 非常有效。 有关详细信息，请参见此处:WriteFileEx MSDN