C / C++ / MFC

#include "stdafx.h"
#include "windows.h"
 #define BUFSIZE 4096
int main()
{   
	HANDLE hFile;  
	HANDLE hTempFile; 
	DWORD  dwBytesRead, dwBytesWritten, dwBufSize=BUFSIZE;  
	char szTempName[MAX_PATH];  
	char buffer[BUFSIZE];   
	char lpPathBuffer[BUFSIZE];   // Open the existing file.  
	hFile = CreateFile("original.txt",  // file name      
		GENERIC_READ,                   // open for reading      
		0,                              // do not share      
		NULL,                           // default security      
		OPEN_EXISTING,                  // existing file only      
		FILE_ATTRIBUTE_NORMAL,          // normal file       
		NULL);                          // no template
 if (hFile == INVALID_HANDLE_VALUE)  
 {       
	 printf("Could not open file.");     
	 return 0;  
 }
 // Get the temp path   
 GetTempPath(dwBufSize,   // length of the buffer     
	 lpPathBuffer);      // buffer for path   
 // Create a temporary file.
 GetTempFileName(lpPathBuffer, // directory for temp files     
	 "NEW",                    // temp file name prefix       
	 0,                        // create unique name       
	 szTempName);              // buffer for name   h
 hTempFile = CreateFile((LPTSTR) szTempName,  // file name      
	 GENERIC_READ | GENERIC_WRITE, // open for read/write     
	 0,                            // do not share       
	 NULL,                         // default security       
	 CREATE_ALWAYS,                // overwrite existing file      
	 FILE_ATTRIBUTE_NORMAL,        // normal file       
	 NULL);                        // no template

if (hTempFile == INVALID_HANDLE_VALUE) 
  {      
	printf("Could not create temporary file.");     
	return 0;  
}
 // Read 4K blocks to the buffer.   
// Change all characters in the buffer to upper case.  
 // Write the buffer to the temporary file.   
do   
{       
	if (ReadFile(hFile, buffer, 4096,          
		&dwBytesRead, NULL))    
	{           
		CharUpperBuff(buffer, dwBytesRead);          
		WriteFile(hTempFile, buffer, dwBytesRead,         
			&dwBytesWritten, NULL);      
	}   
}
while (dwBytesRead == BUFSIZE);
// Close both files.  
 CloseHandle(hFile);   
 CloseHandle(hTempFile);   
 // Move the temporary file to the new text file.
  if (!MoveFileEx(szTempName,                
	  "allcaps.txt",                  
	  MOVEFILE_REPLACE_EXISTING))  
  {     
	  printf("Could not move temp file.");      
	  return 0;   
  }
  return 0;
}