vb6 - How to Pass a Late Bound Parameter -

-

In VB6, I am trying to pass a late bound object into another form.

frmMain Vb 

  dim x set x = CreateObject ("MyOwn.Object") frmDialog set as a dim f fv = new frmDialog f.SetMyOwnObject x

as a parameter in the

frmDialog parameter is a string in which type name is the late-bound object, "MyOwn.Object" ByVal and ByRef do not make any difference, no clue? There is a problem in remembering.

I used the warp (y). The result is 8, for vbString. This object must be 9 - ssorrrell 1 hour ago

Use the print y in the immediate window to find the contents of y - ssorrrell 55 minutes ago

This is to confirm my doubts It looks like MyOwn.Object should contain a default property or method that gives the string.

Therefore, when you try to debug . Print , this will return the value of the default property / method when you hover the variable in the IDE, then VB6 will display the value of the default property / method. When you call VarType call y , this will return the default property or variable type of method.

The reason for this is that when you have the variable type variant that stores a object , and defines the default method or property of the object's class In most situations,

you can see that MyOwn.Object class object browser is used to evaluate the return value of the variable default method or property. Opening the MyOwn.Object is the default member or not. Given your list of class and properties and methods. If you see any method or property with an icon with a small blue circle in the corner, then it indicates that the law or property is the default member of the class. If you find anyone, I can bet that it has been announced to return a string.

Note that if you have your variant S to Object S, you still will face this behavior in many places, for example, even if y has been declared as as an object, is doing a debug. Print Y will still print the value of the default property or method, and VarType (y) will still return 8 (the string).

When VB6 will use the default member and it will not be confused, for example, if you declare y as the object , Then TypeName (y) will return MyOwn.Class , but VarType (y) will still return 8 (string) however, If you declare y as the variant , then TypeName (y) returns string .

If you are using late binding, it is difficult to avoid this side effect, because you only assign your object variable to object or variables < / Code> will be able to declare.


Comments

Post a Comment

Popular posts from this blog

c# - ListView onScroll event -

-
I am programming a simple C # application, and I need a Scallow event on the list view. So I inherited the original ListView class created in ListviewEx witch. I found out how to locate the scroll message from WinAPI and I modified the WndProc method. Now I have this WndProc: protected override zero WndProc (Ref message message) {base.WndProc (Ref I); If (m.msg == WM_VSCROLL) {onScroll (This, New EventArgs ()); }} But the problem is, I do not know how to know about scrolling information. This data should be in wParam, but there is a LOWORD macro ++ like in C in C # and I switch to find the criteria like SB_ below, SB_ENDSCROLL, SB_PAGEUP etc. there any way Need to change the LOWORD macro from C #? Or any other way to find the necessary parameters about scrolling? You can define the WParam constants as the following: Private const int WM_HSCROLL = 0x114; Private Constant WM_VSCROLL = 0x115; Private contact int SBHOZZ = 0; Private Consultant SB_VERT = 1; Private Con...
Read more

PHP - get image from byte array -

-
I am trying to create a back-end for my mobile application. I am sending the content of an image in the body of the HTTP request (output stream) as a byte array, I want to read this stream of bytes in PHP scripts and take back an image. Can anyone tell me how can I do this? Thank you. You can obtain the request body $ body = Reading from file_get_contents ('php: // input'); What you do with that data Depending on you, you can write the data in a file as you mentioned that this is image data, you can drop the data into the object can do. Another option is to use and load the image.
Read more

Linux Terminal Problem with Non-Canonical Terminal I/O app -

-
I have a small app written in C to run on Linux. Part of the app accepts user-input from keyboard , And it uses non-canonical terminal mode so that it can respond to each keystroke. The section of the code that accepts input is a simple task that is called repeatedly in the loop: char get_input () {char C = 0; Int res = reading (input_tamille, & amp; c, 1); If (RSS == 0) 0 returns; If (res == -1) {/ * snip error handling * /} return c; } It reads a letter from the terminal if there is no input within a given time limit, (c_cc [VTIME] value in the vocabulary structure), read () 0 And get_input () is called again It all works very well, I have recently discovered that if you run this app in a terminal window, and then the app Close the terminal window without ending, the app will not exit Received, but CPU intensive launches into an infinite loop, where the read () returns 0 without waiting continued. So how can I get out of the apple if it runs from the terminal win...
Read more