直接上代码吧，写的时候遇到了点问题， 找到根源以后，就搞定了，

注意define的 语法， 错的挺郁闷的

// 20180110_01.cpp : Defines the entry point for the console application.

//



#include "stdafx.h"

#include <windows.h>

#include <stdio.h>

#include <stdlib.h>



#define  FileKey 0x86



//加载PE文件到内存中,并获取文件长度

LPVOID LoadPEFile(LPSTR lpszFile,DWORD &fileSize)

{

	FILE *pFile = NULL;

	//DWORD fileSize = 0;

	LPVOID pFileBuffer = NULL;

	

	//打开文件

	pFile = fopen(lpszFile,"rb");

	

	if(!pFile)

	{

		printf("无法打开文件EXE文件");

		return NULL;

	}

	

	fseek(pFile,0,SEEK_END);

	fileSize = ftell(pFile);

	fseek(pFile,0,SEEK_SET);

	

	//分配缓冲区

	pFileBuffer = malloc(fileSize);

	if(!pFileBuffer)

	{

		printf("分配空间失败!\n");

		fclose(pFile);

		return NULL;

	}

	

	//文件读取

	

	size_t n = fread(pFileBuffer,fileSize,1,pFile);

	

	if(!n)

	{

		printf("读取数据失败\n");

		free(pFileBuffer);

		fclose(pFile);

		return NULL;

	}

	

	//关闭文件

	fclose(pFile);

	return pFileBuffer;

	

}





//内存直接写入到文件

void WirteToFile(LPVOID pFileBuffer,size_t fileSize,LPSTR lpszFile)

{

	FILE *pFile = NULL;	

	//打开文件

	pFile = fopen(lpszFile,"wb");

	

	if(!pFile)

	{

		printf("无法打开文件EXE文件");

		return;

	}

	

	size_t writeSize = fwrite(pFileBuffer,fileSize,1,pFile);

	printf("WirteSize:%d\n",writeSize);

	

	//关闭文件

	fclose(pFile);

	return;

	

}





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

{

	//printf("Hello World!\n");

	//TCHAR srcFilePath = {0};

	LPSTR filePath = "C://noteTemp.exe";

	LPSTR outPath = "C://noteTemp1.exe";

	DWORD fileSize = 0;

	

	LPVOID pFileBuffer = LoadPEFile(filePath,fileSize);

	CHAR* pOld = (CHAR*)pFileBuffer;



	LPVOID pFileBufferNew = malloc(fileSize);

	memset(pFileBufferNew,fileSize,0);

	CHAR* pNew = (CHAR*)pFileBufferNew;



	//数据加密

	for(int i=0;i<(int)fileSize;i++)

	{

		pNew[i] = pOld[i]^FileKey;

		//pOld[i]^=FileKey;

		//int a = pOld[i]^FileKey;



		//memcpy(pNew+i,pOld+i,1);



	}





	WirteToFile(pFileBufferNew,fileSize,outPath);



	return 0;

}