[Repost] API parameter specifier prefix detailed
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Using MASM Write a Windows program, it is actually dealing with the Windows API, and a person is impossible to remember all API usage, so the API reference manual is essential. The API's reference manual is the prototype in the Hungarian representation. The following is the detailed explanation of those prefixes in the API prototype, I hope to help beginners.
Source: Microsoft MSDN Platform SDK Reference
A array array
B Bool (int) Boolean (integer)
By unsigned char (byte) No symbolic characters (bytes)
C char character (byte)
CB Count of bytes bytes
Cr Color Reference Value Color (Reference) Value
CX Count of X (Short) X Collection (Short Integer)
DW DWORD (unsigned long) double word (no symbol length)
f Flags (USUALLY MULTIPLE BIT VALUES) Sign (generally multiple values)
Fn function function
G_ Global Global
H Handle handle
i integer integer
l Long long integer
LP Long Pointer long pointer
M_ Data Member of a Class A class of data members
N Short Int short integer
P P Pointer pointer
String string
SZ ZERO TERMINATED STRING string ends with 0
TM Text Metric Text Rules
u Unsigned int unsigned integer
UL unsigned long (ulong) unsigned long integer
W Word (unsigned short) no symbol short integer
X, Y X, Y Coordinates (Short) Coordinate Value / Short Integer
v void empty
For example, the API function CREATEWINDOWSEX, the API prototype is as follows:
HWND CREATEWINDOWEX
DWORD DWEXSTYLE,
// Extended Window StylelpctStr LpClassName,
// Pointer to Registered Class Name
LPCTSTR LPWINDOWNAME,
// Pointer to Window Name
DWORD DWSTYLE,
// WINDOW STYLE
INT X,
// Horizontal Position of Window
Int Y,
// Vertical Position of Window
Int nwidth,
// WINDOW WIDTH
Int nheight,
// WINDOW HEIGHT
HWND HWNDPARENT,
// Handle to Parent Or Owner Window
Hmenu Hmenu,
// Handle to Menu, Or Child-Window Identifier
Hinstance hinstance,
// Handle to Application Instance
LPVOID LPPARAM
// Pointer to Window-Creation Data
);
Then, according to the above prefix table, DWEXStyle needs a double-word value, lpclassname and lpwindowname need a long pointer to the string (offset address in MASM), X, Y indicates that the integer value is required, NWIDTH and NHEight Indicates that the transmission short integer, hwndparent means that a window handle is required, and the HMENU means that the Hinstance is transmitted, and the LPPARAM represents the program instant (address).
Note You should not see the previous type specifier when you look at the prefix, but you want to look at the prefix, such as DWORD DWEXSTYLE, just look at dwexStyle, know that the double word is passed.
There is also a combination of other combinations, as long as you pay a little attention, such as the LPFN represents a long pointer to the function, is a function of a function in MASM, and is like LPSecurityAttributes, pointing to the Structure_Attributes structure. Pointer (address), LPVBuffer means that the buffer long pointer (LP) is transmitted or empty (Void), and there are some no prefixes, this word is enough to explain it. Wait, familiar with these prefixes allow you to make a quick mastering when you study API. And can eliminate some errors.
