API function calls designed ABOUT window Author: Cai trainability
The Windows 98 system has a Windows style About window that reflects some basic information in the front system, which shows information such as WINDOWS and its application software. Information and other information. The author uses VB 6.0 through the call of the API function to set the application system's About window. The effect is shown in Figure 1. (Omitted) 1. Building a window with the following control: Control Name CAPTION
Window Form1 Test the About window with VB6.0
Command button Command1 is closed in the sales management system
2 . Listing: ---- Private Declare Function GetWindowWord Lib "user32" (ByVal hwnd As Long, ByVal nIndex As Long) As Integer ---- Private Declare Function ShellAbout Lib "shell32.dll" Alias "ShellAboutA" (ByVal hwnd As Long, ByVal szApp As String, ByVal szOtherStuff As String, ByVal hIcon As Long) As Long ---- Private Declare Function ExtractIcon Lib "shell32.dll" Alias "ExtractIconA" (ByVal hinst As Long, ByVal lpszExeFileName As String, ByVal nIconIndex As Long) As Long Private Declare Function GetDiskFreeSpace Lib "kernel32" Alias "GetDiskFreeSpaceA" (ByVal lpRootPathName As String, lpSectorsPerCluster As Long, lpBytesPerSector As Long, lpNumberOfFreeClusters As Long, lpTotalNumberOfClusters As Long) As Long Private Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" (ByVal nDrive As String) As Long ---- Private Declare Sub GetSystemInfo Lib "kernel32" (lpSystemInfo As SYSTEM_INFO) Private Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long Private Const gwl_exstyle = (-20)
Private const GWL_Style = (-16)
Private const GWL_WndProc = (-4)
Private const GWL_HINSTANCE = (-6)
Private Type System_info
Dwoemid As Long
DWPAGESIZE AS Long
LPMINIMUMAPPLICATIONADDRESS AS LonglpMaximumApplicationAddress As Long
DWACTIVEPROCESSORMASK AS Long
Dwnumberfprocessors as long
DWProcessORTYPE AS Long
DwallocationGranularity As Long
DWRESERVED AS Long
End Type
Private const SM_CXScreen = 0
Private const SM_CYSCREEN = 1
Private submmand1_click ()
DIM HINST AS Long
DIM ICONS as long
DIM ABOUTS As Long
DIM DISPX AS STRING
DIM DISPY AS STRING
DIM CPS AS STRING
DIM SPACE1 AS STRING
DIM Space2 As String
Hinst = getWindowWord (me.hwnd, gwl_hinstance)
Icons = Extracticon (Hinst, "D: /FPW26/foxprow.exe", 0)
Dim sysinfo as system_info
DIM CLS1 AS Long
DIM CLS2 As Long
DIM SecS as long
DIM BYTES AS Long
DIM BUFFS AS STRING
BUFF = "C: /"
X = getDriveType (buffs)
x = getDiskFreespace (Buffs, Secs, Bytes, CLS1, CLS2)
CLS1 = CLS1 * SECS * BYTES
CLS2 = CLS2 * SECS * bytes
Space1 = "C drive total capacity:
Format $ (CLS2 / 1024, "#, #") "Thousand Bies"
Space2 = "C Drive available capacity:
" Format $ (CLS1 / 1024," #, # ") " Thousand Bytes "
x = getSystemMetrics (SM_CXSCREEN)
Dispx = "Display Resolution:" STR $ (x)
x = getSystemMetrics (SM_CYSCREEN)
Dispy = STR $ (x)
Call getSystemInfo (sysinfo)
Select Case Sysinfo.dwProcessORTYPE
Case 386
CPUS = "Processor Type: 386"
Case 486
CPUS = "Processor Type: 486"
Case 586
CPUS = "Processor Type: 586"
End SELECT
Abouts = shellabout (me.hwnd, "demo",
"Sales Management System V2.0 All rights reserved [C] 1998-1999 Cai Texas"
& Chr $ (13) & chR $ (10) & Space1 & Chr $ (13) & chr $ (10)
& Space2 & CHR $ (13) & Chr $ (10) & CPUS "" DISPX
"*" DISPY, ICONS) End Sub
---- Upper Up to Windows 98, Visual Basic 6.0 for Windows Environment is available. User can add it to the application system from the About menu item, and call it through the menu item, the effect is better.
