[C++] base de registre; Wallpaper

#include <windows.h>
#include <windowsx.h>
#include <stdio.h>
//#include "project1.h"
#include <time.h>

#define CA_FOIRE 0
#define C_BON 1


class Programme
{
HINSTANCE Hinst;
LPSTR NomFic;
public:
Programme(HINSTANCE);
BOOL ChargeAleatoire();
BOOL RemplaceRegistre();
int Msg( LPSTR fmt, ... );
};

Programme *CProg;

int WINAPI WinMain(HINSTANCE, HINSTANCE Hinst, LPSTR, int)
{
BOOL Err=FALSE;

CProg = new Programme (Hinst);
CProg->ChargeAleatoire();
CProg->RemplaceRegistre();

delete(CProg);
return Err;
}

Programme :: Programme (HINSTANCE Hinstance)
{
Hinst=Hinstance;
NomFic=(LPSTR) malloc(100);
return;
}

BOOL Programme :: ChargeAleatoire(void)
{
int a,i,Nb_Fonds;
time_t tim;
char Buffer[512];
FILE *f=fopen(".\\index.dat","rt");

if (!f) return CA_FOIRE;

fscanf(f,"%d",&Nb_Fonds);printf("il y a  %d fichiers\n",Nb_Fonds);

// fct aléatoire artisanale
// juste pour le fun
a = (int) time(&tim);
a%=Nb_Fonds;
a++;

for (i=0;i<a;i++)
{
fscanf(f,"%s",Buffer);
if (feof(f)) return CA_FOIRE;
}
strcpy(NomFic,Buffer);
printf("nomfic : %s",Buffer);
return C_BON;
}

BOOL Programme :: RemplaceRegistre(void)
{
HKEY hSoftKey,hCompanyKey;
DWORD dw;

RegOpenKeyEx(HKEY_CURRENT_USER, "Control Panel\\Desktop", 0, KEY_WRITE|KEY_READ,
&hSoftKey);
RegSetValueEx(hSoftKey,"WallPaper", NULL, REG_SZ,
(LPBYTE)NomFic, strlen(NomFic)*sizeof(char));//(5+1)*sizeof(TCHAR));
RegCloseKey(hSoftKey);

return C_BON;
}

int Programme :: Msg( LPSTR fmt, ... )
{
char buff[256];
va_list va;

va_start(va, fmt);
wvsprintf(buff, fmt, va);
va_end(va);
lstrcat(buff, "\r\n");

MessageBox( NULL, buff, "Ced Message", MB_OK );

return C_BON;
}


///////////////////////////////////////////////
/// index.dat
/// 2
/// c:\blabla\fonds\image1.bmp
/// c:\blabla\fonds\image2.bmp
// et ainsi de suite ...
///////////////////////////////////////////////