15 questions
0
votes
2
answers
57
views
storing and retrieving a string in tcomponent.tag using freepascal
I want to store this string expression:
oField.displayname+'='+varTostr(fieldbyname(ofield.fieldame).value)
where ofield is TField of dataset in TComponent.Tag. How can I do this?
I am using ...
- 1
0
votes
0
answers
125
views
Confused with error -- E2193 Too few parameters in call to '_fastcall TComponent::GetComponent(int)
I am trying to programmatically remove a selected component from its parent container using the code below (I may be using found incorrectly, but that is not the problem, suggestions are welcome):
...
user16458899
1
vote
1
answer
223
views
How to invoke a procedure created inside the New Component during the implementation
I have created and implemented a New Component and inside this created component, there is a procedure InitCombo that needs to be invoked in the implementation.
How will I do that?
Here's the ...
- 639
1
vote
1
answer
1k
views
I am getting an error "Undeclared Identifier" on my newly created component with TComboBox ancestor
I have created a New Component with TComboBox ancestor using Wizard. Everything went smooth from compiling, building, and installing. Now I tried to use it and I am getting these errors:
Structure
...
- 639
1
vote
1
answer
195
views
How to Create and Destroy TGrid at Runtime in Firemonkey — Android and iOS App Dev
I have a TGrid created at runtime. The procedure requires that I should destroy TGrid before I can re-create at "add item and refresh" button click. I noticed that if I don't destroy TGrid ...
- 639
0
votes
0
answers
162
views
delphi (RIO 10.3 ) get access to the component icons at runtime ( from the package binary resources ? )
Is it possible to get access to the component icons that are used in the IDE, but at runtime?
I understand the icons are compiled as a binary resource into the package during component development, ...
- 87
0
votes
1
answer
926
views
Handle copy component from one form to another in Delphi
Writing my own Delphi VCL component inherited from TComponent with a bunch of properties, that must be unique to component's owner form. When I copy component from one form to another (with simple ...
- 21
0
votes
1
answer
733
views
Delphi: inherited Create gives Access violation
I made an application that opens several other Forms for handling tasks.
All forms work fine, except one.
I am using the same code for all forms. It's like:
FormTypeA := TFormTypeA.Create(...
- 139
1
vote
1
answer
688
views
Firemonkey: cascade a styled Lookup change for a FMXObject where other objects inherit the stylename
I am not sure if is possible - but it seems like it should be to me. Essentially, I want to trigger all the components to refresh their styles when I change a StyleLookup.
I have a FMXComponent ...
- 186
1
vote
2
answers
3k
views
Delphi: Save TComponent to Clientdataset blob field
I have a TComponent class derivative like below, trying to save to a clientdataset blob field:
(Copied from internet, due credits)
type
TSaveComponent = class(TComponent)
private
FFileName: ...
- 565
0
votes
1
answer
298
views
Delphi XE5 ComponentCount segmentation fault (Search parented tcomponent )
This code collect all TFMXControls in a specified root component. Exam the parent and the component name leading. This code working fine in Win32 32.bit windows target, but not in Nexus (android ...
5
votes
1
answer
451
views
Is passing a NULL Owner argument for dynamically created TComponent derived class instances OK?
I work with C++ RAD Studio and Builder 6 quite a bit and often create forms dynamically or create non-visual components dynamically when writing non-visual code. When designing forms, the Owner ...
- 21.3k
3
votes
1
answer
3k
views
Can I serialize a Delphi TPersistent as a field of TComponent using the default WriteComponent action?
I'm getting very confused about how to write out properties from a TComponent that has a TPersistent field. For example I have:
TChildObj = class( TPersistent )
PRIVATE
FVisible: boolean;
...
- 13.5k
6
votes
2
answers
3k
views
Can I use .Create(Nil) instead of .Create(Application)
I have a unit which has a variable of TComponent, I create this component on Initialization of the unit like following :
var
XComp: TComponent;
.
.
.
.
initialization
begin
XCom := TComponent....
- 611
3
votes
3
answers
1k
views
How to access design position on non-visual Delphi components?
When designing a form in the IDE, non-visual components (eg TMainMenus, TDatamodules) can be freely placed and positioned. The position is persisted, so that on reloading the form these components ...
- 68.5k