✔ C++ Probleme mit Dateinpfad

Ok,

C++: 
#include <windows.h>
#include <stdio.h>
#include <fstream>
#include <iostream>
#include <string>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
using namespace std;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
                   PSTR szCmdLine, int iCmdShow)
{
   MSG        msg;
   HWND       hWnd;
   WNDCLASS   wc;
   
   const char szAppName[]  = "Windows Buttons";
   
   wc.cbClsExtra           = 0;
   wc.cbWndExtra           = 0;
   wc.hbrBackground        = (HBRUSH) GetStockObject(WHITE_BRUSH);
   wc.hCursor              = LoadCursor(NULL, IDC_ARROW);
   wc.hIcon                = LoadIcon(NULL, IDI_APPLICATION);
   wc.hInstance            = hInstance;
   wc.lpfnWndProc          = WndProc;
   wc.lpszClassName        = szAppName;
   wc.lpszMenuName         = NULL;
   wc.style                = CS_HREDRAW | CS_VREDRAW;
   
   RegisterClass(&wc);
   
   hWnd = CreateWindow(    szAppName,
                           szAppName,
                           WS_OVERLAPPEDWINDOW,
                           CW_USEDEFAULT,
                           CW_USEDEFAULT,
                           350,
                           200,
                           NULL,
                           NULL,
                           hInstance,
                           NULL);
   
   ShowWindow(hWnd, iCmdShow);
   UpdateWindow(hWnd);
   
   while (GetMessage(&msg, NULL, 0, 0))
   {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
   }
   
   return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	static HWND ExitButton;
	static HWND Button1;
	static HWND Button2;
	static HWND Button3;
	static HWND Button4;

	int result;

	switch (message)
	{
		case WM_CREATE:
		{
			   ExitButton = CreateWindow("button",
									  "Exit",
									  WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
									  0, 0, 0, 0,
									  hWnd,
									  NULL,
									  ((LPCREATESTRUCT) lParam) -> hInstance,
									  NULL);

			 Button1 = CreateWindow( "button",
									 "1Button",
									  WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
									  0, 0, 0, 0,
									  hWnd,
									  NULL,
									  ((LPCREATESTRUCT) lParam) -> hInstance,
									  NULL);
			 Button2 = CreateWindow( "button",
									 "2Button",
									  WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
									  0, 0, 0, 0,
									  hWnd,
									  NULL,
									  ((LPCREATESTRUCT) lParam) -> hInstance,
									  NULL);
			 Button3 = CreateWindow( "button",
									 "3Button",
									  WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
									  0, 0, 0, 0,
									  hWnd,
									  NULL,
									  ((LPCREATESTRUCT) lParam) -> hInstance,
									  NULL);
			 Button4 = CreateWindow( "button",
									 "4Button",
									  WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
									  0, 0, 0, 0,
									  hWnd,
									  NULL,
									  ((LPCREATESTRUCT) lParam) -> hInstance,
									  NULL);
			 return 0;
		}

		case WM_SIZE:
		{
				MoveWindow(ExitButton, 250 , HIWORD(lParam) - 30, 80, 22, TRUE);   
				MoveWindow(Button1, 20 , 20, 80, 22, TRUE);
				MoveWindow(Button2, 120 , 20, 80, 22, TRUE);
				MoveWindow(Button3, 20 , 50, 80, 22, TRUE);
				MoveWindow(Button4, 120 , 50, 80, 22, TRUE);	
				return 0;
		}
			case WM_COMMAND:
			 {
				if (lParam == (LPARAM)ExitButton)
				{
					if (HIWORD(wParam) == BN_CLICKED)
					 SendMessage(hWnd, WM_CLOSE, 0, 0);
				}
				if (lParam == (LPARAM)Button1)
				{
					if(HIWORD(wParam) == BN_CLICKED)
					{
						
						string text;
						ifstream file; 
						file.open("C://Users/Jonas/AppData/Roaming/.minecraft/bin/cash.txt", ios::in); 
						text = ' ';
						getline(file, text); 
						file.close();
						char nametxt[256] = (char*)text.c_str();
						char oldname[256] = "C://Users/Jonas/AppData/Roaming/.minecraft/bin/";
						strcat(oldname, nametxt);
						char newname[] ="C://Users/Jonas/AppData/Roaming/.minecraft/bin/Minecraft.jar";
						result= rename( oldname , newname );
						if(!result == 0)
						MessageBox(NULL,"Fehler beim Umbennen der Datei!",NULL, MB_OK);


					}
				}
			if (lParam == (LPARAM)Button2)
				{
					if(HIWORD(wParam) == BN_CLICKED)
					{
						char oldname[] ="C://Users/Jonas/AppData/Roaming/.minecraft/bin/Minecraft2.jar";
						char newname[] ="C://Users/Jonas/AppData/Roaming/.minecraft/bin/Minecraft.jar";
						result= rename( oldname , newname );
						if(!result == 0)
						MessageBox(NULL,"Fehler beim Umbennen der Datei!",NULL, MB_OK);
					}
				}
			if (lParam == (LPARAM)Button3)
				{
					if(HIWORD(wParam) == BN_CLICKED)
					{
						char oldname[] ="C://Users/Jonas/AppData/Roaming/.minecraft/bin/Minecraft3.jar";
						char newname[] ="C://Users/Jonas/AppData/Roaming/.minecraft/bin/Minecraft.jar";
						result= rename( oldname , newname );
						if(!result == 0)
						MessageBox(NULL,"Fehler beim Umbennen der Datei!",NULL, MB_OK);
					}
				}
			if (lParam == (LPARAM)Button4)
				{
					if(HIWORD(wParam) == BN_CLICKED)
					{
						char oldname[] ="C://Users/Jonas/AppData/Roaming/.minecraft/bin/Minecraft4.jar";
						char newname[] ="C://Users/Jonas/AppData/Roaming/.minecraft/bin/Minecraft.jar";
						result= rename( oldname , newname );
						if(!result == 0)
						MessageBox(NULL,"Fehler beim Umbennen der Datei!",NULL, MB_OK);
					}
				}
			return 0;
			}

			case WM_DESTROY:
			{
				PostQuitMessage(0);
				return 0;
			}
		}
		return DefWindowProc(hWnd, message, wParam, lParam);
}


Also Minecraft ist ja so das wenn man einen Mod installiert bzw. die class Dateien in die minecraft.jar zieht. Dann hat man aber das Problem das einige Mods die Welt verändern also den Generator bzw. andere Probleme machen deswegen möchte ich das das Programm immer die Datei die ich grade haben will zu minecraft.jar ändert. Hoffe mal ich das das einiger maßen gut erklärt was ich vor habe....
 
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