此次PE檔案解析的內容：PE頭、節表、匯入表、匯出表、重定位表

語言：C語言

編譯器：VS2013

執行環境：win10

注：由於時間（懶）關係，備註的比較少，看不懂的地方，歡迎留言一起交流，也歡迎指正不當之處

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

IMAGE_DOS_HEADER DosHeader;
PIMAGE_DOS_HEADER pDosHeader;
IMAGE_NT_HEADERS NtHeader;
PIMAGE_NT_HEADERS pNtHeader;
IMAGE_FILE_HEADER FileHeader;
PIMAGE_FILE_HEADER pFileHeader;
IMAGE_OPTIONAL_HEADER OptionHeader;
PIMAGE_OPTIONAL_HEADER pOptionHeader;
PIMAGE_DATA_DIRECTORY pDataDirectory;
IMAGE_SECTION_HEADER SectionHeader;


//char * filepath = "PETool.exe";
//char * filepath = "notepad.exe";
//char * filepath = "sxs.dll";
//char * filepath = "SciLexer.dll";
char * filepath = "msgsc.dll";
//char * filepath = "NppExport.dll";
//char * filepath = "symsrv.dll";


long e_lfanew;

//void HextoChar(char strHex[8]);
DWORD RvaToRwa(PIMAGE_NT_HEADERS pNtHeader, DWORD Rva);
DWORD RvaToName(PIMAGE_NT_HEADERS pNtHeader, DWORD Rva);

void main(int argc, char * agrv[])
{


	HANDLE hFile = CreateFileA(filepath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL);
	HANDLE hMapping = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
	PVOID pbFile = MapViewOfFile(hMapping, FILE_MAP_ALL_ACCESS, 0, 0, 0);
	if (hFile == INVALID_HANDLE_VALUE || hMapping == NULL || pbFile == NULL)
	{
		printf("\n========THE FILE IS NOT EXCTING===========\n");
		if (hFile != INVALID_HANDLE_VALUE)
		{
			CloseHandle(hFile);
		}
		if (hMapping != NULL)
		{
			CloseHandle(hMapping);
		}
		if (pbFile != NULL)
		{
			UnmapViewOfFile(pbFile);
		}
	}



	/*開始列印DOS頭*/
	puts("=================PE DOS HEADER==================");

	pDosHeader = (PIMAGE_DOS_HEADER)pbFile;

	printf("e_magic:%0X        ", pDosHeader->e_magic);
	//列印"MZ"標誌
	char arry_dosheader_e_magic[sizeof(pDosHeader->e_magic)];
	memcpy(arry_dosheader_e_magic, &pDosHeader->e_magic, sizeof(pDosHeader->e_magic));
	for (int i = 0; i < sizeof(pDosHeader->e_magic) && arry_dosheader_e_magic[i] != '\0'; i++)
	{
		printf("%c", arry_dosheader_e_magic[i]);
	}
	printf("\ne_cblp:%04X\n", pDosHeader->e_cblp);
	printf("e_cp:%04X\n", pDosHeader->e_cp);
	printf("e_crlc:%04X\n", pDosHeader->e_crlc);
	printf("e_cparhdr:%04X\n", pDosHeader->e_cparhdr);
	printf("e_minalloc:%04X\n", pDosHeader->e_minalloc);
	printf("e_maxalloc:%04X\n", pDosHeader->e_maxalloc);
	printf("e_ss:%04X\n", pDosHeader->e_ss);
	printf("e_sp:%04X\n", pDosHeader->e_sp);
	printf("e_csum:%04X\n", pDosHeader->e_csum);
	printf("e_ip:%04X\n", pDosHeader->e_ip);
	printf("e_cs:%04X\n", pDosHeader->e_cs);
	printf("e_lfarlc:%04X\n", pDosHeader->e_lfarlc);
	printf("e_ovno:%04X\n", pDosHeader->e_ovno);
	printf("e_res[4]:%016X\n", pDosHeader->e_res[1]);
	printf("e_oemid:%04X\n", pDosHeader->e_oemid);
	printf("e_oemid:%04X\n", pDosHeader->e_oeminfo);
	printf("e_res[10]:%020X\n", pDosHeader->e_res[1]);
	printf("e_lfanew:%08X\n", pDosHeader->e_lfanew);
	e_lfanew = pDosHeader->e_lfanew;

	pNtHeader = (PIMAGE_NT_HEADERS)((DWORD)pbFile + pDosHeader->e_lfanew);
	/*開始列印NT頭*/
	puts("\n=================PE NT HEADER==================");

	printf("Signature:%0X        ", pNtHeader->Signature);
	//列印"PE"標誌
	char arry_nt_Signature[sizeof(pNtHeader->Signature)];
	memcpy(arry_nt_Signature, &pNtHeader->Signature, sizeof(pNtHeader->Signature));
	for (int i = 0; i < sizeof(pNtHeader->Signature) && arry_nt_Signature[i] != '\0'; i++)
	{
		printf("%c", arry_nt_Signature[i]);
	}

	/*開始列印FILE頭*/
	puts("\n\n=================PE FILE HEADER==================");

	printf("Machine:%04X\n", pNtHeader->FileHeader.Machine);
	printf("NumberOfSections:%04X\n", pNtHeader->FileHeader.NumberOfSections);
	printf("TimeDateStamp:%08X\n", pNtHeader->FileHeader.TimeDateStamp);
	printf("PointerToSymbolTable:%08X\n", pNtHeader->FileHeader.PointerToSymbolTable);
	printf("NumberOfSymbols:%08X\n", pNtHeader->FileHeader.NumberOfSymbols);
	printf("SizeOfOptionalHeader:%04X\n", pNtHeader->FileHeader.SizeOfOptionalHeader);
	printf("Characteristics:%04X\n", pNtHeader->FileHeader.Characteristics);

	/*開始列印OPTIONAL頭*/
	puts("\n=================PE OPTIONAL HEADER==================");

	printf("Machine:%04X\n", pNtHeader->OptionalHeader.Magic);
	printf("MajorLinkerVersion:%02X\n", pNtHeader->OptionalHeader.MajorLinkerVersion);
	printf("MinorLinkerVersion:%02X\n", pNtHeader->OptionalHeader.MinorLinkerVersion);
	printf("SizeOfCode:%08X\n", pNtHeader->OptionalHeader.SizeOfCode);
	printf("SizeOfInitializedData:%08X\n", pNtHeader->OptionalHeader.SizeOfInitializedData);
	printf("SizeOfUninitializedData:%08X\n", pNtHeader->OptionalHeader.SizeOfUninitializedData);
	printf("AddressOfEntryPoint:%08X\n", pNtHeader->OptionalHeader.AddressOfEntryPoint);
	printf("BaseOfCode:%08X\n", pNtHeader->OptionalHeader.BaseOfCode);
	printf("BaseOfData:%08X\n", pNtHeader->OptionalHeader.BaseOfData);
	printf("ImageBase:%08X\n", pNtHeader->OptionalHeader.ImageBase);
	printf("SectionAlignment:%08X\n", pNtHeader->OptionalHeader.SectionAlignment);
	printf("FileAlignment:%08X\n", pNtHeader->OptionalHeader.FileAlignment);
	printf("MajorOperatingSystemVersion:%04X\n", pNtHeader->OptionalHeader.MajorOperatingSystemVersion);
	printf("MinorOperatingSystemVersion:%04X\n", pNtHeader->OptionalHeader.MinorOperatingSystemVersion);
	printf("MajorImageVersion:%04X\n", pNtHeader->OptionalHeader.MajorImageVersion);
	printf("MinorImageVersion:%04X\n", pNtHeader->OptionalHeader.MinorImageVersion);
	printf("MajorSubsystemVersion:%04X\n", pNtHeader->OptionalHeader.MajorSubsystemVersion);
	printf("MinorSubsystemVersion:%04X\n", pNtHeader->OptionalHeader.MinorSubsystemVersion);
	printf("Win32VersionValue:%08X\n", pNtHeader->OptionalHeader.Win32VersionValue);
	printf("SizeOfImage:%08X\n", pNtHeader->OptionalHeader.SizeOfImage);
	printf("SizeOfHeaders:%08X\n", pNtHeader->OptionalHeader.SizeOfHeaders);
	printf("CheckSum:%08X\n", pNtHeader->OptionalHeader.CheckSum);
	printf("Subsystem:%04X\n", pNtHeader->OptionalHeader.Subsystem);
	printf("DllCharacteristics:%04X\n", pNtHeader->OptionalHeader.DllCharacteristics);
	printf("SizeOfStackReserve:%08X\n", pNtHeader->OptionalHeader.SizeOfStackReserve);
	printf("SizeOfStackCommit:%08X\n", pNtHeader->OptionalHeader.SizeOfStackCommit);
	printf("SizeOfHeapReserve:%08X\n", pNtHeader->OptionalHeader.SizeOfHeapReserve);
	printf("SizeOfHeapCommit:%08X\n", pNtHeader->OptionalHeader.SizeOfHeapCommit);
	printf("LoaderFlags:%08X\n", pNtHeader->OptionalHeader.LoaderFlags);
	printf("NumberOfRvaAndSizes:%08X\n", pNtHeader->OptionalHeader.NumberOfRvaAndSizes);

	/*開始列印資料目錄表*/
	puts("\n=================PE IMAGE_DATA_DIRECTORY HEADER==================");
	pDataDirectory = &(pNtHeader->OptionalHeader.DataDirectory);
	printf("Table Name\t\tVirtualAddress\t\tSize\n\n");
	printf("Export Table\t\t%08X\t\t%08X\n", pDataDirectory[0].VirtualAddress, pDataDirectory[0].Size);
	printf("Import Table\t\t%08X\t\t%08X\n", pDataDirectory[1].VirtualAddress, pDataDirectory[1].Size);
	printf("Resources Table\t\t%08X\t\t%08X\n", pDataDirectory[2].VirtualAddress, pDataDirectory[2].Size);
	printf("Exception Table\t\t%08X\t\t%08X\n", pDataDirectory[3].VirtualAddress, pDataDirectory[3].Size);
	printf("Security Table\t\t%08X\t\t%08X\n", pDataDirectory[4].VirtualAddress, pDataDirectory[4].Size);
	printf("Base relocation Table\t%08X\t\t%08X\n", pDataDirectory[5].VirtualAddress, pDataDirectory[5].Size);
	printf("Debug Table\t\t%08X\t\t%08X\n", pDataDirectory[6].VirtualAddress, pDataDirectory[6].Size);
	printf("Copyrught Table\t\t%08X\t\t%08X\n", pDataDirectory[7].VirtualAddress, pDataDirectory[7].Size);
	printf("Global Ptr Table\t%08X\t\t%08X\n", pDataDirectory[8].VirtualAddress, pDataDirectory[8].Size);
	printf("TLS Table\t\t%08X\t\t%08X\n", pDataDirectory[9].VirtualAddress, pDataDirectory[9].Size);
	printf("Load config Table\t%08X\t\t%08X\n", pDataDirectory[10].VirtualAddress, pDataDirectory[10].Size);
	printf("Bound Import Table\t%08X\t\t%08X\n", pDataDirectory[11].VirtualAddress, pDataDirectory[11].Size);
	printf("IAT Table\t\t%08X\t\t%08X\n", pDataDirectory[12].VirtualAddress, pDataDirectory[12].Size);
	printf("Delay Import Table\t%08X\t\t%08X\n", pDataDirectory[13].VirtualAddress, pDataDirectory[13].Size);
	printf("COM descriptor Table\t%08X\t\t%08X\n", pDataDirectory[14].VirtualAddress, pDataDirectory[14].Size);
	printf("Retention Table\t\t%08X\t\t%08X\n", pDataDirectory[15].VirtualAddress, pDataDirectory[15].Size);

	PIMAGE_SECTION_HEADER pSectionHeader = (PIMAGE_SECTION_HEADER)IMAGE_FIRST_SECTION(pNtHeader);
	/*開始列印SECTION頭*/
	puts("\n=================PE SECTION HEADER==================");
	for (int count = 0; count < pNtHeader->FileHeader.NumberOfSections; count++)
	{

		//列印節區標誌
		printf("\n----------------");
		char arry_section_text[sizeof(pSectionHeader->Name)];
		memcpy(arry_section_text, &pSectionHeader->Name, sizeof(pSectionHeader->Name));
		for (int i = 0; i < sizeof(pSectionHeader->Name) && arry_section_text[i] != '\0'; i++)
		{
			printf("%c", arry_section_text[i]);
		}
		printf("----------------\n");
		printf("Name\t\t\t");
		for (int i = 0; i < sizeof(pSectionHeader->Name) && arry_section_text[i] != '\0'; i++)
		{
			printf("%c", arry_section_text[i]);
		}
		//printf("=============%s", pSectionHeader->Name);
		printf("\nVirtualSize\t\t%08X\n", pSectionHeader->Misc.VirtualSize);
		printf("VirtualAddress\t\t%08X\n", pSectionHeader->VirtualAddress);
		printf("SizeOfRawData\t\t%08X\n", pSectionHeader->SizeOfRawData);
		printf("PointerToRawData\t%08X\n", pSectionHeader->PointerToRawData);
		printf("PointerToRelocation\t%08X\n", pSectionHeader->PointerToRelocations);
		printf("PointerToLinenumbers\t%08X\n", pSectionHeader->PointerToLinenumbers);
		printf("NumberOfRelocations\t%04X\n", pSectionHeader->NumberOfRelocations);
		printf("NumberOfLinenumbers\t%04X\n", pSectionHeader->NumberOfLinenumbers);
		printf("Characteristics\t\t%08X\n", pSectionHeader->Characteristics);

		pSectionHeader++;
	}

	
	///*列印匯入表*/
	
	puts("\n=======================================Import Table=================================\n");
	DWORD Importe_table_offset = RvaToRwa(pNtHeader, (DWORD)pNtHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
	PIMAGE_IMPORT_DESCRIPTOR pImportDirectory = (PIMAGE_IMPORT_DESCRIPTOR)((DWORD)pbFile + Importe_table_offset);
	
	DWORD Importe_table_offset_Name = (DWORD)pbFile + RvaToRwa(pNtHeader, pImportDirectory->Name);
	//printf("\n-------------------------%s----------------------------\n", Importe_table_offset_Name);
	//printf("%s", Importe_table_offset_Name);
	
	while (TRUE)
	{
		if (pImportDirectory->OriginalFirstThunk == 0 && pImportDirectory->TimeDateStamp == 0 && pImportDirectory->ForwarderChain == 0 && pImportDirectory->Name == 0 && pImportDirectory->FirstThunk == 0)
		{
			break;
		}
		DWORD Importe_table_offset_Name = (DWORD)pbFile + RvaToRwa(pNtHeader, pImportDirectory->Name);
		printf("\n-------------------------%s----------------------------\n", Importe_table_offset_Name);
		printf("\nTrunk Rva\tTrunk Rwa\tTrunk value\tHint\tFounction_Name/Founction_Num\n");
		DWORD Importe_table_offset_OriginalFirstThunk = (DWORD)pbFile + RvaToRwa(pNtHeader, pImportDirectory->OriginalFirstThunk);
		DWORD * pTrunkData = (DWORD*)Importe_table_offset_OriginalFirstThunk;
		int n = 0;
		while (pTrunkData[n] != 0)
		{
			DWORD TrunkData = pTrunkData[n];
			DWORD Trunk_RVA = pImportDirectory->OriginalFirstThunk;

			if (TrunkData < IMAGE_ORDINAL_FLAG32)
			{
				PIMAGE_IMPORT_BY_NAME pImportByName = (PIMAGE_IMPORT_BY_NAME)((DWORD)pbFile + RvaToRwa(pNtHeader, TrunkData));
				
				printf("\n%08X\t%08X\t%08X\t%04X\t%s\n", Trunk_RVA, RvaToRwa(pNtHeader, Trunk_RVA), TrunkData, pImportByName->Hint, pImportByName->Name);
			}
			else
			{
				DWORD funum = (DWORD)(TrunkData - IMAGE_ORDINAL_FLAG32);
				printf("\n%08X\t%08X\t%08X\t——\t%d\n", Trunk_RVA, RvaToRwa(pNtHeader, Trunk_RVA), TrunkData, funum);
				//printf("fountion_num:%d", funum);
			}
			n++;
			(Trunk_RVA) += sizeof(Trunk_RVA);
		}
		pImportDirectory++;
	}
	
	/*列印匯出表*/
	puts("\n=================================Export Table===========================\n");
	DWORD Export_table_offset = RvaToRwa(pNtHeader, (DWORD)pNtHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);
	PIMAGE_EXPORT_DIRECTORY pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)((DWORD)pbFile + Export_table_offset);
	DWORD EXport_table_offset_Name = (DWORD)pbFile + RvaToRwa(pNtHeader, pExportDirectory->Name);
	DWORD * pNameOfAddress =(DWORD *)((DWORD)pbFile + RvaToRwa(pNtHeader, pExportDirectory->AddressOfNames));
	DWORD * pFunctionOfAdress = (DWORD *)((DWORD)pbFile + RvaToRwa(pNtHeader, pExportDirectory->AddressOfFunctions));
	WORD * pNameOrdinalOfAddress = (WORD *)((DWORD)pbFile + RvaToRwa(pNtHeader, pExportDirectory->AddressOfNameOrdinals));

	printf("Name:%s\n", EXport_table_offset_Name);
	printf("NameOfAddress:%08X\n", RvaToRwa(pNtHeader, pExportDirectory->AddressOfNames));
	printf("FunctionOfAdress:%08X\n", RvaToRwa(pNtHeader, pExportDirectory->AddressOfFunctions));
	printf("NameOrdinalOfAddress:%08X\n", RvaToRwa(pNtHeader, pExportDirectory->AddressOfNameOrdinals));

	if (pExportDirectory->NumberOfFunctions == 0)
	{
		puts("!!!!!!!!!!!!!!!!!NO EXPORT!!!!!!!!!!!!!!!!!!!!!");
		if (hFile != INVALID_HANDLE_VALUE)
		{
			CloseHandle(hFile);
		}
		if (hMapping != NULL)
		{
			CloseHandle(hMapping);
		}
		if (pbFile != NULL)
		{
			UnmapViewOfFile(pbFile);
		}

	}

	printf("NumberOfNames:%d\n", pExportDirectory->NumberOfNames);
	printf("NumberOfFunctions:%d\n", pExportDirectory->NumberOfFunctions);

	puts("\n---------------------------------NAME EXPORT---------------------------------\n");

	int NumberOfFounctions = (int)pExportDirectory->NumberOfFunctions;
	int * pIsFound = (int*)malloc(sizeof(int)*NumberOfFounctions);
	int k;
	for (k = 0; k < pExportDirectory->NumberOfFunctions; k++)
	{
		pIsFound[k] = 0;
	}
	
	printf("ExportNum\tName\t\t\tRva\n");
	for (int i = 0; i < pExportDirectory->NumberOfNames; i++)
	{	
		
		DWORD FunctionAddress = pFunctionOfAdress[pNameOrdinalOfAddress[i]];
		DWORD FunName = (DWORD)pbFile + RvaToRwa(pNtHeader, pNameOfAddress[i]);
		pIsFound[pNameOrdinalOfAddress[i]] = 1;
		
		printf("%d\t\t%-10s\t\t%04X\t\t\n", pExportDirectory->Base + pNameOrdinalOfAddress[i], FunName, FunctionAddress);
	}

	if (pExportDirectory->NumberOfFunctions != pExportDirectory->NumberOfNames)
	{
		puts("\n--------------NUMBER EXPORT------------------\n");
		printf("ExportNum\tName\t\t\tRva\n");
		for (int m = 0; m < pExportDirectory->NumberOfFunctions; m++)
		{
			if (pIsFound[m] != 1)
			{
				DWORD FunctionAdress = pFunctionOfAdress[m];
				printf("%d\t\t——%-10s\t\t%04X\t\t\n", pExportDirectory->Base + m, FunctionAdress);
			}
		}
	}
	else
	{
		printf("\nNO NUMBER EXPORT\n");
	}

	free(pIsFound);
	/*列印重定位表*/
	typedef struct  _OFFSET_TYPE
	{
		WORD offset : 12;
		WORD type : 4;
	}OFFSET_TYPE,*POFFSET_TYPE;
	puts("\n=================================Base Relocation Table===========================\n");
	
	DWORD RelocRva = pNtHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress;
	if (!RelocRva)
	{
		printf("NOT FOUND Base Relocation Table");
		return 0;
	}
	PIMAGE_BASE_RELOCATION pReloc = (PIMAGE_BASE_RELOCATION)((DWORD)pbFile + RvaToRwa(pNtHeader, RelocRva));
	while (pReloc->SizeOfBlock)
	{	
		printf("\n--------------------------------------------------\n");
		DWORD Count = (pReloc->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / sizeof(WORD);
		POFFSET_TYPE pOffset = (POFFSET_TYPE)(pReloc + 1);
		for (int i = 0; i < Count; ++i)
		{	
			if (pOffset[i].type == 3)
			{
				DWORD RelocDataRva = pReloc->VirtualAddress + pOffset->offset;
				DWORD RelocDataFoa = (DWORD)((DWORD)pbFile + RvaToRwa(pNtHeader, RelocDataRva));
				DWORD RealDataVA = *(DWORD*)RelocDataFoa;
				DWORD RealDataRva = RealDataVA - pNtHeader->OptionalHeader.ImageBase;
				DWORD RealDataFoa = (DWORD)(RvaToRwa(pNtHeader, RealDataRva) + (DWORD)pbFile);

				printf("需要重定位的第%d個數據		RVA：%0X		FOA：%0X		改成：[%0X]\n", i + 1, RelocDataRva, RelocDataFoa, RealDataFoa);
				pOffset++;
			}
			
		}
		pReloc = (PIMAGE_BASE_RELOCATION)((DWORD)pReloc + pReloc->SizeOfBlock);
		
	}


	if (hFile != INVALID_HANDLE_VALUE)
	{
		CloseHandle(hFile);
	}
	if (hMapping != NULL)
	{
		CloseHandle(hMapping);
	}
	if (pbFile != NULL)
	{
		UnmapViewOfFile(pbFile);
	}
	
	getchar();
	return 0;


}


DWORD RvaToRwa(PIMAGE_NT_HEADERS pNtHeader, DWORD Rva)
{
	PIMAGE_SECTION_HEADER pSectionHeader = (PIMAGE_SECTION_HEADER)IMAGE_FIRST_SECTION(pNtHeader);
	for (int i = 0; i < pNtHeader->FileHeader.NumberOfSections; i++)
	{
		//printf("%0x", pSectionHeader[i].VirtualAddress);
		DWORD SectionBeginRva = pSectionHeader[i].VirtualAddress;

		DWORD SectionEndRva = pSectionHeader[i].VirtualAddress + pSectionHeader[i].SizeOfRawData;
		//printf("%0x,%0x", SectionBeginRva, SectionEndRva);
		if (Rva >= SectionBeginRva && Rva <= SectionEndRva)
		{
			DWORD Temp = Rva - SectionBeginRva;
			DWORD Rwa = Temp + pSectionHeader[i].PointerToRawData;
			return Rwa;
		}
	}

}

/*
DWORD RvaToName(PIMAGE_NT_HEADERS pNtHeader, DWORD Rva)
{
	PIMAGE_SECTION_HEADER pSectionHeader = (PIMAGE_SECTION_HEADER)IMAGE_FIRST_SECTION(pNtHeader);
	for (int i = 0; i < pNtHeader->FileHeader.NumberOfSections; i++)
	{
		//printf("%0x", pSectionHeader[i].VirtualAddress);
		DWORD SectionBeginRva = pSectionHeader[i].VirtualAddress;

		DWORD SectionEndRva = pSectionHeader[i].VirtualAddress + pSectionHeader[i].SizeOfRawData;
		//printf("%0x,%0x", SectionBeginRva, SectionEndRva);
		if (Rva >= SectionBeginRva && Rva <= SectionEndRva)
		{
			//DWORD Temp = Rva - SectionBeginRva;
			//DWORD Rwa = Temp + pSectionHeader[i].PointerToRawData;
			return pSectionHeader[i].Name;
		}
	}

}

*/

/*
void HextoChar(char strHex[8])
{
	//char strHex[8]; 
	char ch[8];
	char  str[2];
	int i = 0, temp = 0, x = 0, str_num = 0, y;
	//long long answer = 0;   

	for (i = 0; i<8 && strHex[i] != '\0'; i++)
	{

		if (i % 2 == 0)
		{
			switch (strHex[i]){
			case 'A': temp = 10; break;
			case 'B': temp = 11; break;
			case 'C': temp = 12; break;
			case 'D': temp = 13; break;
			case 'E': temp = 14; break;
			case 'F': temp = 15; break;
			default: temp = strHex[i] - '0'; break;
			}
			ch[i] = (temp*pow(16, 1));
			//printf("%d",ch[i]);
		}
		else
		{
			switch (strHex[i])
			{
			case 'A': temp = 10; break;
			case 'B': temp = 11; break;
			case 'C': temp = 12; break;
			case 'D': temp = 13; break;
			case 'E': temp = 14; break;
			case 'F': temp = 15; break;
			default: temp = strHex[i] - '0'; break;
			}
			ch[i] = temp;
			//printf("%d",ch[i]);	
		}
	}
	for (x = 0; x<8 && ch[x] != '\0'; x++, str_num++)
	{

		if (x % 2 == 0)
		{
			char temp_num = ch[x] + ch[x + 1];
			//printf("%c",temp_num);
			str[str_num] = temp_num;
			//str_num++;
			//printf("%d",str[str_num]);
		}
		else{
			continue;
		}
	}
	//printf("%d",str_num);
	for (y = 3; y>0; y--){
		if (str[y - 1] != '\0'){
			printf("%c", str[y - 1]);
		}
		else{
			continue;
		}
	}
}
*/