强制转换可能丢失值

// testpehead.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

#include <stdio.h>
#include <windows.h>
#include <Commdlg.h>

int main(int argc, char* argv[])
{
	char szFilePath[MAX_PATH];//要分析的文件名及路径
	OPENFILENAME ofn;//定义结构，调用打开对话框选择要分析的文件及其保存路径

	HANDLE hFile;// 文件句柄
	HANDLE hMapping;// 映射文件句柄
	LPVOID ImageBase;// 映射基址

	PIMAGE_DOS_HEADER  pDH = NULL;//指向IMAGE_DOS结构的指针
	PIMAGE_NT_HEADERS  pNtH = NULL;//指向IMAGE_NT结构的指针
	PIMAGE_FILE_HEADER pFH = NULL;//指向IMAGE_FILE结构的指针
	PIMAGE_OPTIONAL_HEADER pOH = NULL;//指向IMAGE_OPTIONALE结构的指针

	//必要的初始换
	memset(szFilePath, 0, MAX_PATH);
	memset(&ofn, 0, sizeof(ofn));
	ofn.lStructSize = sizeof(ofn);
	ofn.hwndOwner = NULL;
	ofn.hInstance = GetModuleHandle(NULL);
	ofn.nMaxFile = MAX_PATH;
	ofn.lpstrInitialDir = L".";
	ofn.lpstrFile = (LPWSTR)szFilePath;
	ofn.lpstrTitle = L"选择 PE文件打开 by For";
	ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;
	ofn.lpstrFilter = L"*.exe\0*.exe\0";//过滤器

	if (!GetOpenFileName(&ofn))//调用打开对话框，选择要分析的文件
	{
		MessageBox(NULL, L"打开文件错误", NULL, MB_OK);
		return 0;
	}

	//选择要分析的文件后，经过3步打开并映射选择的文件到虚拟内存中
	//1.创建文件内核对象，其句柄保存于hFile，将文件在物理存储器的位置通告给操作系统
	hFile = CreateFile(ofn.lpstrFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
	if (!hFile)
	{
		MessageBox(NULL, L"打开文件错误", NULL, MB_OK);
		return 0;
	}

	//2.创建文件映射内核对象（分配虚拟内存），句柄保存于hFileMapping
	hMapping = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
	if (!hMapping)
	{
		CloseHandle(hFile);
		return FALSE;
	}

	//3.将文件数据映射到进程的地址空间，返回的映射基址保存在ImageBase中
	ImageBase = MapViewOfFile(hMapping, FILE_MAP_READ, 0, 0, 0);
	if (!ImageBase)
	{
		CloseHandle(hMapping);
		CloseHandle(hFile);
		return FALSE;
	}

	//IMAGE_DOS Header结构指针
	pDH = (PIMAGE_DOS_HEADER)ImageBase;
	//IMAGE_NT Header结构指针
	pNtH = (PIMAGE_NT_HEADERS)((DWORD)pDH + pDH->e_lfanew);
	//IMAGE_File Header结构指针
	pFH = &pNtH->FileHeader;
	//IMAGE_Optional Header结构指针
	pOH = &pNtH->OptionalHeader;

	//输出各个结构中重要成员的取值
	printf("Dos header RVA:%08lX\n", pDH - ImageBase);
	printf("NT header RVA:%08lX\n", pDH->e_lfanew);
	printf("File header RVA:%08lX\n", pDH->e_lfanew + sizeof(pNtH->Signature));
	printf("Optional header RVA:%08lX\n", pDH->e_lfanew +
		sizeof(pNtH->Signature) + +sizeof(pNtH->FileHeader));
	printf("Section header RVA:%08lX\n",
		pDH->e_lfanew + sizeof(pNtH->Signature) +
		sizeof(pNtH->OptionalHeader) + sizeof(pNtH->FileHeader));

	printf("e_magic:            %04X   ASCII值为：%c%c\n",
		pDH->e_magic, pDH->e_magic % 256, pDH->e_magic / 256);
	printf("e_lfarlc:           %08X\n", pDH->e_lfarlc);

	printf("\n\nSignature:      %08X      ASCII值：%c%c00\n",
		pNtH->Signature, pNtH->Signature % 4096, pNtH->Signature / 256);

	printf("Machine:            %04X\n", pFH->Machine);
	printf("NumberOfSections:   %04X\n", pFH->NumberOfSections);
	printf("Characteristics:    %04X\n", pFH->Characteristics);

	printf("Magic:              %04X\n", pOH->Magic);
	printf("SizeOfCode:         %08X\n", pOH->SizeOfCode);
	printf("AddressOfEntryPoint:%08X\n", pOH->AddressOfEntryPoint);
	printf("ImageBase:          %08X\n", pOH->ImageBase);
	printf("SectionAlignment:   %08X\n", pOH->SectionAlignment);
	printf("FileAlignment:      %08X\n", pOH->FileAlignment);
	printf("SizeOfImage:        %08X\n", pOH->SizeOfImage);

	system("pause");
	return 0;
}

ofn.lpstrFile = (LPWSTR)szFilePath;

szFilePath值C

标签：转换,pNtH,printf,ofn,丢失,pOH,pDH,强制,NULL
来源： https://www.cnblogs.com/hshy/p/10715430.html