The system keeps that address (which is the target of the hook) and uses it to call back into your application at the appropriate time (i.e when the relevant hook event triggers). But if you close your application, its address space is destroyed and the hook is no longer valid, so the system will no longer call it.
Sorry I don't know the answer to that one. There is an implication that injecting the hook into another process can be done of the call-back function is in a dll. If that is the case then the dll must be associated withe the address space of that process. I must admit it is a long time since I used this feature so my recollection of it is not 100%.
Why I am asking that ? Even if _open return 3, further more, the reading of boot section has failed.
say that my boot device is not NTFS:
if (! ntfs_boot_sector_is_ntfs(bs))
errno = EINVAL;
BOOL ntfs_boot_sector_is_ntfs(NTFS_BOOT_SECTOR* b)
BOOL ret = FALSE;
ntfs_log_debug("Beginning bootsector check.\n");
ntfs_log_debug("Checking OEMid, NTFS signature.\n");
if (b->oem_id != const_cpu_to_le64(0x202020205346544eULL)) // "NTFS "
ntfs_log_error("NTFS signature is missing.\n"); // <--- my code run by here
Of course, this debugging session ran as admin mode.
I haven't gotten around to check this out myself yet, but I am studying the "Windows Internals" book by Mark Russinovich (the guy creating the Sysinternals suite). There I found that the object name \Device\HarddiskX\DRX (with 'X' being replaced by a digit from 0 upwards; you can find it using the Sysinternals WinObj utility).
It is not clear to me when to use this name and when to use the \Global??\PhysicalDriveX name. Russinovich writes that "The Windows application layer converts the name to \Global??\PhysicalDriveX berofe handling the name to the Windwows object manager" - it seems like that PhysicalDriveX format is some old legacy format. It is far from clear to me!
So you may try a Global??\ prefix, or you might try \Device\HarddiskX\DRX (appearently with X replaced by 2 in your case). When you find out what works, tell it, and I will use it when I get that far myself!
I was not pointing out the name to be used -- I was pointing out the access that must be used. Since your disk name is correct (assuming that drive 2 exists ), the access mode seems like a good subject for investigation. A quick google indicates this is OS-dependent when using the open function.
Be wary of strong drink. It can make you shoot at tax collectors - and miss. Lazarus Long, "Time Enough For Love" by Robert A. Heinlein
it`s a pointer back to a texture (surface) data.
(I found people do this:
I don`t understand how void works though Richard. isn`t a variable a sequence of bytes? long is 8 bytes so the data is split at an 8 size step? which doesn`t make sense since a pixel is made of 3 maybe 4 bytes.
It's just a way of allowing the compiler to generate the correct code for a pointer, without needing to know what it actually points to. It is often used when the ultimate data may be more than one type. In order to access the actual content you need to use a cast, like you have shown above.
As to the structure of the real data, you will need to look at the documentation.
Your struct contains one int and one pointer. If the second member said int* rather than void*, it would be exactly the same at run time - but at compile time, you would be warned if you tried to set .pBits to point to anything but an int. A void* can be set to point to anything.
Remember that in C, a pointer is nothing but a runtime address - no type info, no size info. An array name is a pointer to the start of a memory area; the index is an offset from this start address (the index value must be multiplied with the element size to get the offset in bytes). Runtime info knows only of the start address, and nothing of index limits and element type. In memory, a 1-element DWORD array is identical to a single DWORD variable. It looks like an array because you write code to address memory locations with some offset.
If you ask the compiler to address something pointed to by .pBits, the compiler doesn't know what to find there. Do you want to fetch a single byte from memory? Or a DWORD? Maybe .pBits really is a pointer to a struct, and you want to address a struct member at a given offset (i.e. member name). You have to tell the compiler how to interpret the pointer. This is because you haven't declared it as e.g. a DWORD* but as a void*.
In your example, the programmer tells the compiler: "Treat .pBits as a DWORD*, a pointer to a double word!" Here, the pointer itself is copied to another pointer, which can be used to access the DWORD pointed to - that is just as a convenient shorthand notation. Whether following code uses the typed DWORD* 'pbits' or '(DWORD*)lockedrect.pBits' makes no difference (at least not until you want to change one of the two pointers without changing the other one).
I can't tell why the void* was cast to a DWORD*. My guess, from the name D3DLOCKED_RECT, is that .pBits points to a 3D coordinate, like a 3 element array (or maybe even an array of 3D points). The code you quote wants to manipulate the 3 values as a single unit (e.g for more efficient moving/copying). Why is a void* used, instead of a typed pointer? Probably because the struct can be used with different resolutions (maybe that is what is indicated by the .pitch member?): In some applications, the coordinates are represented by three 16 bit values, in other applications by three 32 bit values. In low-resolution applications, it could even be three 8-bit values. You cast it to whatever coordinate size you use.
The quoted code makes it look as if the coordinates could be three 64 bit values. I very much doubt that any graphical system would use 64 bit coordinates (unless you make 3D model of the known universe...). So probably the use of DWORD is just for efficiency, doing moving/copying of as few operations as possible. That you could probably find out reading the rest of the code where you found this line.
Last Visit: 2-Dec-20 17:35 Last Update: 2-Dec-20 17:35