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Simple encryption program

Discussion in 'Win32' started by Trebbert, Sep 23, 2007.

  1. Trebbert

    Trebbert New Member

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    in C i am trying to do a simple encryption that gets the ASCII value of the character then doubles it and subtracts 25 then to decrypt adds 25 and divides by 2 but it does not seem to be working here is the relevant code.I am using Dev C++ and am just learning the WIN32 API so i have copied and modified most of this code from a tutorial.

    Code:
    case IDC_MAIN_EDIT:
        {
        int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_MAIN_EDIT));
        if(len > 0)
        {
        int i,j;
        char* buf;
        buf = (char*)malloc( len + 1);
        GetDlgItemText(hwnd, IDC_MAIN_EDIT, buf, len + 1);
       
        //... do stuff with text ...
        for (i=0;i<len;i++)
        {
            j = buf[i];
       //     if(j >> 1 > 255)
           
            j = (j  * 2)^ (1/2);
            buf[i] =j;
        }
        SetDlgItemText(hwnd, IDC_MAIN_ENC,buf );
        
        GlobalFree((HANDLE)buf);
        }
    else
    SetDlgItemText(hwnd, IDC_MAIN_ENC,"" );
            
        }  
    break;
    
    case IDC_MAIN_ENC:
        {
        int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_MAIN_ENC));
        if(len > 0)
        {
        int i,j;
        char* buf;
        buf = (char*)malloc( len + 1);
        GetDlgItemText(hwnd, IDC_MAIN_ENC, buf, len + 1);
       
        //... do stuff with text ...
        for (i=0;i<len;i++)
        {
            j = buf[i];
           // if((j << 1)>255)
           
            j = j ^ 2 /2;
            buf[i] =j;
        }
        SetDlgItemText(hwnd, IDC_MAIN_EDIT,buf );
        
        GlobalFree((HANDLE)buf);
        }
    else
    SetDlgItemText(hwnd, IDC_MAIN_EDIT,"" );
            
        }  
    break;
    
    Thanks
     

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