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Код
#define STRICT
#include <windows.h>
#include <windowsx.h>
#include <tchar.h>
#include <stdio.h>
HINSTANCE hI;
void OnPaint(HWND);
HWND hwndResidue;
HWND hwnd;
HWND hwndEdit;
HWND hwndEdit2;
HWND hwndEdit3;
int nTime;
HFONT hFont;

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);
BOOL OnCreate(HWND hwnd,LPCREATESTRUCT);
void OnCommand(HWND,int id,HWND,UINT);
//void OnPaint(HWND hwnd);
void OnDestroy(HWND);

#define ID_GO3    100


int WINAPI WinMain(HINSTANCE hInst,HINSTANCE,LPSTR,int){
    char szClassName[]="MainWindow";
            srand((unsigned int)GetTickCount());
    char szTitle[]="RND";
    MSG msg;
    WNDCLASS wc;
    hI=hInst;
    memset(&wc,0,sizeof(wc));
    wc.lpszClassName=szClassName;
    wc.hInstance=hInst;
    wc.lpfnWndProc=WndProc;
    wc.hCursor=LoadCursor(NULL,IDC_ARROW);
    wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wc.hbrBackground=GetStockBrush(LTGRAY_BRUSH);
    RegisterClass(&wc);
    HWND hwnd=CreateWindow(szClassName,szTitle,WS_OVERLAPPEDWINDOW,10,10,400,150,HWND_DESKTOP,NULL,hInst,NULL);
    ShowWindow(hwnd,SW_SHOWNORMAL);
    while(GetMessage(&msg,NULL,0,0)){
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
    switch(msg){
        HANDLE_MSG(hwnd,WM_CREATE,OnCreate);
        HANDLE_MSG(hwnd,WM_COMMAND,OnCommand);
        HANDLE_MSG(hwnd,WM_DESTROY,OnDestroy);
        //HANDLE_MSG(hwnd,WM_PAINT,OnPaint);

    }
            return(DefWindowProc(hwnd,msg,wParam,lParam));
}
    
BOOL OnCreate(HWND hwnd,LPCREATESTRUCT)
{

CreateWindow("BUTTON","Дробные",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,
                      260,70,80,20,hwnd,(HMENU)ID_GO3,hI,NULL);    


char szFace[]="Times New Roman Cyr";
LOGFONT lf;
ZeroMemory(&lf,sizeof(lf));
strcpy(lf.lfFaceName,szFace);
lf.lfHeight=8;
hFont=CreateFontIndirect(&lf);

    return TRUE;
}

int ErrorMessageBox(HWND hWnd, LPCTSTR lpFunctionName, LPCTSTR lpTitle, UINT uType)
{
    TCHAR buf[1024];
    LPTSTR pDscr = 0;
    DWORD dwErr = GetLastError();
    FormatMessage(0x1100, 0, dwErr, 0, (char*)&pDscr, 0, 0);
    _sntprintf(buf, sizeof(buf)/sizeof(TCHAR), _T("%s failed with error %d: %s"), lpFunctionName, dwErr, pDscr);
    buf[sizeof(buf)/sizeof(TCHAR)-1] = 0;        // need for snprintf
    LocalFree((HLOCAL)pDscr);
    return MessageBox(hWnd, buf, lpTitle, uType);
}


void OnCommand(HWND,int id,HWND,UINT)//А вот функция срабатывающая при нажатии кнопки
{


    if(id==ID_GO3){
        OPENFILENAME ofn9;
        char HTMFilePUT1[1000];
        HTMFilePUT1[0] = 0;                    // 1
        ZeroMemory(&ofn9, sizeof(ofn9));
        ofn9.lStructSize = sizeof(OPENFILENAME);
        ofn9.hwndOwner =hwnd;
        ofn9.lpstrFile = HTMFilePUT1;
        ofn9.nMaxFile = sizeof(HTMFilePUT1);
        ofn9.lpstrFilter = "All\0*.*\0Text\0*.TXT\0";
        ofn9.nFilterIndex = 1;
        ofn9.lpstrFileTitle = NULL;
        ofn9.nMaxFileTitle = 0;
        ofn9.lpstrInitialDir = NULL;
        if(GetOpenFileName(&ofn9)){
            HANDLE hWipedFile4300;
            hWipedFile4300 = CreateFile("ne.html",
                            GENERIC_WRITE,
                            FILE_SHARE_READ,
                            NULL,
                            /*CREATE_NEW*/ CREATE_ALWAYS,
                            0,NULL);
            if(hWipedFile4300==INVALID_HANDLE_VALUE)
            {
                ErrorMessageBox(hwnd, _T("CreateFile"), 0, 16);
            } else {
                MessageBox(hwnd, "Success", "", 0);
                CloseHandle(hWipedFile4300);
            }
        }
            
    }
    
}
void OnPaint(HWND hwnd)
{
        /*PAINTSTRUCT ps;
        HDC hdc=BeginPaint(hwnd,&ps);
        SetBkColor(hdc,RGB(198,195,198));*/

}
void OnDestroy(HWND){
    DeleteFont(hFont);
    PostQuitMessage(0);
}