void Dlg_OnCommand(HWND hWnd, int id, HWND hWndCtl, UINT codeNotify) {
UINT uIndex = 0;
switch (id) {
case IDCANCEL:
EndDialog(hWnd, id);
break;
case IDC_RESERVE:
// Reserve enough address space to hold the array of structures.
g_pSomeData = (PSOMEDATA) VirtualAlloc(NULL,
MAX_SOMEDATA * sizeof(SOMEDATA), MEM_RESERVE, PAGE_READWRITE);
// Disable the Reserve button and enable all the other controls.
EnableWindow(GetDlgItem(hWnd, IDC_RESERVE), FALSE);
EnableWindow(GetDlgItem(hWnd, IDC_INDEXTEXT), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_INDEX), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_USE), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_GARBAGECOLLECT), TRUE);
// Force the index edit control to have the focus.
SetFocus(GetDlgItem(hWnd, IDC_INDEX));
// Force the memory map to update
InvalidateRect(hWnd, &g_rcMemMap, FALSE);
break;
case IDC_INDEX:
if (codeNotify != EN_CHANGE)
break;
uIndex = GetDlgItemInt(hWnd, id, NULL, FALSE);
if ((g_pSomeData != NULL) && chINRANGE(0, uIndex, MAX_SOMEDATA - 1))
{
MEMORY_BASIC_INFORMATION mbi;
/* Retrieves information about a range of pages
* in the virtual address space of the calling process.
* To retrieve information about a range of pages
* in the address space of another process, use the VirtualQueryEx function.
*
* lpAddress [in, optional]
* A pointer to the base address of the region of pages to be queried.
* This value is rounded down to the next page boundary.
* To determine the size of a page on the host computer, use the GetSystemInfo function.
* If lpAddress specifies an address above the highest memory address accessible to the process,
* the function fails with ERROR_INVALID_PARAMETER.
*
* lpBuffer [out]
* A pointer to a MEMORY_BASIC_INFORMATION structure
* in which information about the specified page range is returned.
*/
VirtualQuery(&g_pSomeData[uIndex], &mbi, sizeof(mbi));
/* State
* The state of the pages in the region.
* This member can be one of the following values.
* MEM_COMMIT
* 0x1000
* Indicates committed pages for which physical storage has been allocated,
* either in memory or in the paging file on disk.
*
*/
BOOL bOk = (mbi.State == MEM_COMMIT);
if (bOk)
bOk = g_pSomeData[uIndex].bInUse;
EnableWindow(GetDlgItem(hWnd, IDC_USE), !bOk);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), bOk);
}
else
{
EnableWindow(GetDlgItem(hWnd, IDC_USE), FALSE);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), FALSE);
}
break;
case IDC_USE:
uIndex = GetDlgItemInt(hWnd, IDC_INDEX, NULL, FALSE);
// NOTE: New pages are always zeroed by the system
/* Commit memory allocated for g_pSomeData[uIndex] */
VirtualAlloc(
&g_pSomeData[uIndex],
sizeof(SOMEDATA),
MEM_COMMIT,
PAGE_READWRITE);
/* Mark this part of array as used */
g_pSomeData[uIndex].bInUse = TRUE;
EnableWindow(GetDlgItem(hWnd, IDC_USE), FALSE);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), TRUE);
// Force the Clear button control to have the focus.
SetFocus(GetDlgItem(hWnd, IDC_CLEAR));
// Force the memory map to update
InvalidateRect(hWnd, &g_rcMemMap, FALSE);
break;
case IDC_CLEAR:
uIndex = GetDlgItemInt(hWnd, IDC_INDEX, NULL, FALSE);
g_pSomeData[uIndex].bInUse = FALSE;
EnableWindow(GetDlgItem(hWnd, IDC_USE), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), FALSE);
// Force the Use button control to have the focus.
SetFocus(GetDlgItem(hWnd, IDC_USE));
break;
case IDC_GARBAGECOLLECT:
GarbageCollect(g_pSomeData, MAX_SOMEDATA, sizeof(SOMEDATA));
// Force the memory map to update
InvalidateRect(hWnd, &g_rcMemMap, FALSE);
break;
}
}
void Dlg_OnCommand(HWND hWnd, int id, HWND hWndCtl, UINT codeNotify) {
UINT uIndex = 0;
switch (id) {
case IDCANCEL:
EndDialog(hWnd, id);
break;
case IDC_RESERVE:
// Reserve enough address space to hold the array of structures.
g_pSomeData = (PSOMEDATA) VirtualAlloc(NULL,
MAX_SOMEDATA * sizeof(SOMEDATA), MEM_RESERVE, PAGE_READWRITE);
// Disable the Reserve button and enable all the other controls.
EnableWindow(GetDlgItem(hWnd, IDC_RESERVE), FALSE);
EnableWindow(GetDlgItem(hWnd, IDC_INDEXTEXT), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_INDEX), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_USE), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_GARBAGECOLLECT), TRUE);
// Force the index edit control to have the focus.
SetFocus(GetDlgItem(hWnd, IDC_INDEX));
// Force the memory map to update
InvalidateRect(hWnd, &g_rcMemMap, FALSE);
break;
case IDC_INDEX:
if (codeNotify != EN_CHANGE)
break;
uIndex = GetDlgItemInt(hWnd, id, NULL, FALSE);
if ((g_pSomeData != NULL) && chINRANGE(0, uIndex, MAX_SOMEDATA - 1)) {
MEMORY_BASIC_INFORMATION mbi;
VirtualQuery(&g_pSomeData[uIndex], &mbi, sizeof(mbi));
BOOL bOk = (mbi.State == MEM_COMMIT);
if (bOk)
bOk = g_pSomeData[uIndex].bInUse;
EnableWindow(GetDlgItem(hWnd, IDC_USE), !bOk);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), bOk);
} else {
EnableWindow(GetDlgItem(hWnd, IDC_USE), FALSE);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), FALSE);
}
break;
case IDC_USE:
uIndex = GetDlgItemInt(hWnd, IDC_INDEX, NULL, FALSE);
// NOTE: New pages are always zeroed by the system
VirtualAlloc(&g_pSomeData[uIndex], sizeof(SOMEDATA),
MEM_COMMIT, PAGE_READWRITE);
g_pSomeData[uIndex].bInUse = TRUE;
EnableWindow(GetDlgItem(hWnd, IDC_USE), FALSE);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), TRUE);
// Force the Clear button control to have the focus.
SetFocus(GetDlgItem(hWnd, IDC_CLEAR));
// Force the memory map to update
InvalidateRect(hWnd, &g_rcMemMap, FALSE);
break;
case IDC_CLEAR:
uIndex = GetDlgItemInt(hWnd, IDC_INDEX, NULL, FALSE);
g_pSomeData[uIndex].bInUse = FALSE;
EnableWindow(GetDlgItem(hWnd, IDC_USE), TRUE);
EnableWindow(GetDlgItem(hWnd, IDC_CLEAR), FALSE);
// Force the Use button control to have the focus.
SetFocus(GetDlgItem(hWnd, IDC_USE));
break;
case IDC_GARBAGECOLLECT:
GarbageCollect(g_pSomeData, MAX_SOMEDATA, sizeof(SOMEDATA));
// Force the memory map to update
InvalidateRect(hWnd, &g_rcMemMap, FALSE);
break;
}
}
