Microsoft Windows Programming

Windows Data Types

DWORD - 0 up to 4,294,967,295

DWORD dwVariable = 42;

SIZE_T - Size Type - Used to represent the size of an object in bytes

SIZE_T stVariable = sizeof(int);

VOID - Used to represent the absence of type

VOID vVariable = NULL;

LPVOID - Long Pointer to Void - Used to represent a pointer to any type

LPVOID lpvVariable = NULL;

HANDLE - Used to represent a handle to an object

HANDLE hVariable = CreateFile(...);

LPCSTR - Long Pointer to Constant String - Used to represent a pointer to a constant string

LPCSTR lpcstrVariable = "Hello, World!";

PCSTR - Pointer to Constant String - Used to represent a pointer to a constant string

PCSTR pcstrVariable = "Hello, World!";

LPWSTR - Long Pointer to Wide String - Used to represent a pointer to a wide string

LPWSTR lpwstrVariable = L"Hello, World!";

ULONG_PTR - Unsigned Long Pointer - Used to represent an unsigned long pointer

PVOID Pointer = malloc(100);
Pointer = (ULONG_PTR)Pointer + 10;

ANSI and Unicode Data Types

ANSI - American National Standards Institute - Uses 1 byte to represent a character Unicode - Uses 2 bytes to represent a character

char cVariable = 'A';
wchar_t wcVariable = L'A';

Windows api error

5 - Access Denied

2 - File Not Found

3 - Path Not Found

6 - Invalid Handle

8 - Not Enough Memory

87 - Invalid Parameter

Windows NtStatus

0xC0000005 - Access Violation

0xC0000006 - In Page Error

0xC0000007 - Page File Error

0xC0000008 - Invalid Handle

0xC0000009 - Bad Initial Stack

0xC000000A - Bad Initial PC

0xC000000B - Invalid Object

0xC000000C - Invalid Object Type

0xC000000D - No Such File

0xC000000E - Stack Overflow

0xC000000F - Too Many Modules

0xC0000010 - File Not Found

0xC0000011 - Bad File Type

0xC0000012 - Not A Directory

0xC0000013 - Bad Data

0xC0000014 - Port Not Set

0xC0000015 - Port Not Canceled

0xC0000016 - Invalid Port Attributes

0xC0000017 - Port Closed

0xC0000018 - Invalid Device Request

0xC0000019 - Invalid Transport Request

0xC000001A - No Such Device

0xC000001B - Device Not Ready

0xC000001C - Invalid Device State

0xC000001D - No Memory

0xC000001E - No More Entries

0xC000001F - Not All Assigned

0xC0000020 - Some Not Mapped

0xC0000021 - Oplock Break In Progress

0xC0000022 - Volume Mounted

0xC0000023 - Too Many Links

0xC0000024 - Old Name

0xC0000025 - Directory Not Empty

0xC0000026 - Filename Exced Range

0xC0000027 - Delete Pending

0xC0000028 - Incompatible With Global Short Name Registry Setting

0xC0000029 - Short Name Not Allowed

0xC000002A - Cannot Delete

0xC000002B - Cannot Read

0xC000002C - Configuration Conflict

0xC000002D - Cannot Write

0xC000002E - Unknown Revision

0xC000002F - Revision Mismatch

0xC0000030 - Invalid Owner

0xC0000031 - Invalid Primary Group

0xC0000032 - No Impersonation Token

0xC0000033 - Cant Disable Mandatory

0xC0000034 - No Logon Servers

0xC0000035 - No Sids

0xC0000036 - Unknown Package

0xC0000037 - Unknown Package Type

0xC0000038 - Logon Session Exists

0xC0000039 - Logon Session Not Found

0xC000003A - Package Already Exists

0xC000003B - Package Does Not Exist

0xC000003C - Package Not Installed

0xC000003D - Invalid Package

0xC000003E - Invalid Package Type

0xC000003F - Cannot Load Registry File

0xC0000040 - Debug Error

0xC0000041 - Error

#define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
NTSTATUS Status = NtCreateFile(...);
if (!NT_SUCCESS(Status))
{
    printf("Error: 0x%08X\n", Status);
}