vb6 book

I used VB6 Enterprise Edition to encapsulate a DLL, which has four VB forms: form1, form2, form3, form4, in VBE of excel 2003, class modules and standard modules in DLL are successfully called with VBA code, but VB forms cannot be called or displayed !!! How should I call it? To display ???The calling process is as follows: Open the excel worksheet and display form1 (Judge and start form4 when form1 is started); click the two buttons in form1 to call

Use VB6 to create a toolbar. If you use the toolbar wizard, it will clear the key attribute of the button style attribute value in the toolbar that you have set to 3-tbrseparator. The solution is to use 4-placeholder instead of 3-tbrseparator, get the same running appearance, and do not lose the key attribute value when using the toolbar wizard. I just found that if I set it to 4-placeholder without setting image indexes, the buttons will be lost whe

I have been hiding from the first day, and I have to skip the 15th day. I finally want to upgrade a VB6 project to VB. NET. On my colleague's computer, there is no problem with the upgrade. But on my computer, the upgrade process seems to be quite smooth, that is, when the upgrade is almost complete, the project file cannot be opened, the project file is named. vbproj. vs7.vbproj. Open this file in vs2008 and prompt to upgrade. Okay, continue to upgra

VB6: Create a project and place a progress bar control on the interface. Enter the followingCode:Option explicit Private declare function postmessage lib "USER32" alias "postmessagea" (byval hwnd as long, byval wmsg as long, byval wparam as long, byval lparam as long) as longPrivate const pbm_setbarcolor = h409Private const pbm_setbkcolor = h2001 Private sub form_load ()Postmessage progressbar1.hwnd, pbm_setbarcolor, 0, vbredPostmessage progressba

VB6 allows you to easily compile OCX controls and DLL components. To use DLL components on your website, you can directly use Server in ASP. createObject ("project name. you can call this component on the server. The use of OCX is complicated because it needs to be downloaded to the client. The following are some of my experiences:Pack OCX into an internet package:Start package: Choose "external program"> "external program manager&

Private WithEventsHTMLDocument asHTMLDocumentPrivate WithEventsBtncompute asMSHTML. HtmlbuttonelementPrivate WithEventsTxtNum1 asMSHTML. HtmlinputtextelementPrivate WithEventsTxtNum2 asMSHTML. HtmlinputtextelementPrivate WithEventsTxtresult asMSHTML. HtmlinputtextelementPrivate FunctionBtncompute_onclick () as Boolean on Error GoToErrHandler:txtResult.Value=CDBL(Txtnum1.value) +CDBL(Txtnum2.value)Exit FunctionErrHandler:MsgBoxErr.DescriptionEnd FunctionPrivate SubCommand1_Click () text1.visi

; } Code in the 2.VB6 '******************************************************************* ' ' Function: Converts the string content into 16-encoded data, and the inverse process is decode ' Parameter description: ' Strsource the original string to be transformed Public Function Encode (Strencode As String) as String Dim I as Long Dim chrtmp$ Dim bytelower$, byteupper$ Dim strreturn$ ' Store converted Encoding For i = 1 to Len (Strencode) chrtmp$ = M

Control VB6 can easily write OCX control and DLL components, to use the use of DLL components in the Web site is very simple, directly in the ASP using Server.CreateObject ("project name. Component Name") can be called on the server side of the component. OCX use is because of the need to download to the client and become more complex, here are some of my experience: OCX packaged as an Internet package: Shipment Packaging Program: Menu "Add-Ins"-"Ad

Programming Using APIs to program the cursor in VB6: Option explicitprivate Type pointapi X as long Y as Longend typeprivate Declare Functi On GetCursorPos Lib "user32" (Lppoint as Pointapi) as Longprivate Declare Function showcursor Lib "user32" (ByVal bshow as Long) as Longpublic Function Getxcursorpos () as long Dim pt as pointapi GetCursorPos Ptnbs P Getxcursorpos = Pt. Xend functionpublic Function Getycursorpos () as long Dim pt as pointapi GetCu

Control actually vs.net a registry file has been given on the third installation disk and the import can register the VB6 control. If you can't find it for a while, here's what the file is: REGEDIT Hkey_classes_root\licenses = licensing:copying The keys may be a violation of established copyrights. Masked Edit Control 6.0 license key hkey_classes_root\licenses\bc96f860-9928-11cf-8afa-00aa00c00905 = Mmimfflflmqmlfffrlnmofhfkgrlmmfmqkqj Chart Contro

Fortunately, we can use COM components to maximize the functionality of the ASP. You know, anything that can be written in a language such as VB,VC and VJ and other programming languages can be applied to the development of your Web site, which is COM (Component Object model). COM can be used to write objects that can be invoked by ASP. When the programming environment such as VB to complete the compilation of components, it can be placed in the ASP page is called by the ASP. In this article, we

It is estimated that many books have ignored this powerful tool. You can open the Object Browser by pressing F2 in the VB6 IDE, or by selecting the Object Browser menu item in the View menu. Object Browser as shown in figure: Can see the above image contains red, blue, orange, yellow, green Five colors of the box, the same color inside the word indicates their use (here no one color blindness it.) ), there are several buttons next to the list and sea

Different from. Net, in VB6, ByRef is used by default to pass parameters. It seems that there is nothing to optimize. However, if you call an API, the Code copied from the API browser is forced to use ByVal to pass the parameter. This gives us the opportunity to optimize. I used this code again to test the difference between ByRef and ByVal. The result is very exciting: ByRef is 16 times higher than ByVal. The Code is as follows. The longer the string

loaded into that memory and the memory address is loaded into the stack for a common CPU execution. This well-allocated address handle is the instance handle of this class. That's what a class pointer really stores.When invoking a property, method, or event of a variable, it is actually the CPU that executes the compiled location code according to the code register and the internal jump, and each instance has a separate block of memory, even though the structure has been, but the content is dif

The precision of a double type is indeed the highest in a definable type, but a valid number is 15 or 16 bitsAnother decimal data type valid bit can reach 28 or 29 bits, but does not contain exponential bitsShould be able to understand this:Decimal precision is higher but the range of numbers is small; double insteadand the decimal data type can only be used in a variant, that is, you cannot declare a variable to be of type decimalThere's a master here that gives you a way to solve an example us

process of this program is probably: first execute attachconsole (-1), that is, attaching the parent process. If the double-click is turned on, Attachconsole (-1) will fail and return false, then the call AllocConsole is executed later. If the command line is called, then Attachconsole (-1) succeeds and returns True, so the subsequent call allocconsole is not executed.The principle is very simple, now generate EXE, run on the command line to see if the title has been changed to my Console also

The project is saved in the installation directory ("C:\Program Files (x86) \microsoft Visual Studio\vb98\errhandler1.vbp").File Manager can not find this file, the VB menu opens the File List dialog box to find this file, the file has a lock.It's strange to see the file property owner. Tip cannot display all current people.Files can be deleted.It is forbidden to write this directory without administrator privileges. It seems to have been written, but only in the

Generally, the control styles provided by VB cannot meet your needs. Therefore, you need to change the control styles frequently. If many controls are required for the project, in order to unify the control styles, you need to copy controls frequently to ensure the uniformity of styles. Therefore, to synchronize the styles of controls, Program There will be a lot of work, and the design style can not be retained, so we can use the add-ins function of VB6