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 I don't think this is the right place to post this question.
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I already responded to this question here[^]. If you have supplementary queries then post them in the original thread, do not start a new thread with the same question.
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hummmmm. but i was looking for some more different answers...
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Nilesh Hamane wrote: i was looking for some more different answers.
What does this mean? Your question has been answered according to the information you provided, I have no idea what more you need to know. If you have a specific problem with your own programs then you can post them here. If you have a problem with someone else's programs then you should try asking the provider. For example, if IP Messenger has some issues then try asking the people who wrote the program for help.
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Actually what i'm trying to do is to get a multiline rows selection without the problem of holding the ctrl key (i'm developing a touchscrenn app).
By now i quite get it with a list of selected lines, but if i try to click fast on the rows it give me some painting error. Can someone give me a hint. (Maybe i should fire the ctrl command? i don't know how to simulate the pressdown command  )
#ifndef _CSTDGV_
#define _CSTDGV_
namespace primoAlpha {
using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Security::Permissions;
public ref class personalDataGridView : DataGridView
{
public:
personalDataGridView()
{
this->selectedRowIndexes=gcnew Collections::ArrayList();
this->MultiSelectForced=false;
}
property bool MultiSelectForced
{
bool get() {
return _MultiSelectForced;
}
void set(bool value) {
this->_MultiSelectForced = value;
this->selectedRowIndexes->Clear();
processSelectedRowIndexes();
}
}
protected:
virtual void OnCurrentCellChanged (EventArgs^ e) override
{
if (this->CurrentRow!=nullptr && _MultiSelectForced) {
int act_row=this->CurrentRow->Index;
if (selectedRowIndexes->Contains(act_row)) {
selectedRowIndexes->Remove(act_row);
}
else selectedRowIndexes->Add(act_row);
processSelectedRowIndexes();
}
DataGridView::OnCurrentCellChanged(e);
}
private:
Collections::ArrayList ^selectedRowIndexes;
bool _MultiSelectForced;
void processSelectedRowIndexes() {
this->SuspendLayout();
this->ClearSelection();
for (int i=0;i<selectedRowIndexes->Count;i++) {
if (selectedRowIndexes[i]!="0") {
this->Rows[Convert::ToInt32(selectedRowIndexes[i]->ToString())]->Selected=true;
}
}
this->ResumeLayout();
}
};
}
#endif
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  the solution...if you need...
#ifndef _CSTDGV_
#define _CSTDGV_
namespace primoAlpha {
using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Security::Permissions;
public ref class personalDataGridView : DataGridView
{
public:
personalDataGridView()
{
this->selectedRowIndexes=gcnew Collections::ArrayList();
this->MultiSelectForced=false;
}
property bool MultiSelectForced
{
bool get() {
return _MultiSelectForced;
}
void set(bool value) {
this->_MultiSelectForced = value;
this->selectedRowIndexes->Clear();
processSelectedRowIndexes();
}
}
protected:
virtual void OnCellMouseDown(DataGridViewCellMouseEventArgs^ e) override
{
DataGridView::OnCellMouseDown(e);
if (e!=nullptr && _MultiSelectForced) {
int act_row=e->RowIndex;
if (selectedRowIndexes->Contains(act_row)) {
selectedRowIndexes->Remove(act_row);
}
else selectedRowIndexes->Add(act_row);
processSelectedRowIndexes();
}
}
virtual void OnMouseMove(MouseEventArgs^ e) override
{}
private:
Collections::ArrayList ^selectedRowIndexes;
bool _MultiSelectForced;
void processSelectedRowIndexes() {
this->SuspendLayout();
this->ClearSelection();
for (int i=0;i<selectedRowIndexes->Count;i++) {
if (selectedRowIndexes[i]!="0") {
this->Rows[Convert::ToInt32(selectedRowIndexes[i]->ToString())]->Selected=true;
}
}
this->ResumeLayout();
}
};
}
#endif
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Hello. I posted this here because I noticed this issue first while working on a C++/CLI project. But it equally applies to C#.NET projects which makes me think it's a general .NET issue.
Has anyone had troubles with the Form.StartPosition property value CenterParent in Windows 7? I know my invoking code is fine because I started this project on WinXP and everything was happy. Code like this in the main application form:
MyForm^ f = gcnew MyForm();
f->Show(this);
Despite the fact that I'm passing the reference to the parent in the Show() call, the child form shows up in the upper left corner rather than the center of the parent.
Any ideas?
Thanks in advance.
modified on Wednesday, December 9, 2009 3:34 PM
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What happens if you explicitly set the Parent property
of MyForm before calling ShowDialog()?
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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First, I have to correct myself. The problem is in Show(), not ShowDialog(). I tried to explicitly set the parent ahead of time like this:
MyForm^ f = gcnew MyForm();
f->Parent = this;
f->Show();
Doing so gave me a runtime error at the line where I set the Parent property:
ArgumentException: Top-level control cannot be added to a control.
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Xpnctoc wrote: ArgumentException: Top-level control cannot be added to a control.
Maybe set TopLevel to false?
MyForm^ f = gcnew MyForm();
f->TopLevel = false;
f->Parent = this;
f->Show();
Mark Salsbery
Microsoft MVP - Visual C++
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That didn't fly either. I didn't get an error, but the child window just plain didn't show up anywhere on the screen, taskbar, or anywhere else.
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It was worth a try... I don't know what your parent window
is so I was just guessing, based on the fact there's a difference
between "parent" windows and "owner" windows.
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Well maybe that's part of my problem. I wasn't aware there is a difference. Could you explain that or provide a link that would elaborate on that more?
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I would start in the Form class properties[^]
(Owner and Parent).
Also maybe search on ".net parent vs owner" or similar.
What are you using as a parent? A Win32 window (HWND) or another
Form/Control?
Mark Salsbery
Microsoft MVP - Visual C++
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The main application is a .NET Form.
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it looks to me the only way to do this without making
the form modal is manually...
MyForm^ f = gcnew MyForm();
f->StartPosition = FormStartPosition::Manual;
f->Location = System::Drawing::Point((this->Width - f->Width) / 2 + this->Location.X, (this->Height - f->Height) / 2 + this->Location.Y);
f->Show();
Mark Salsbery
Microsoft MVP - Visual C++
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for ( y = 10 ; ; y++)
{
for (int x = 10; x <= ImageWidth/2 ; ++x)
{
colorref = Image->GetPixel(x,y);
R = GetRValue(colorref);
G = GetGValue(colorref);
B = GetBValue(colorref);
if ( R < 200 && G < 200 && B < 200)
{
miny_StudentName = y;
minx_StudentName = x;
goto exitfor;
//break;
}
}
exitfor:
}
 Failure is Success If we learn from it!!
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Does this mean anything? Do you have a question?
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I'm attempting to write communication software to talk to a laser via RS232. If I setup a Managed C++ class that has a SerialPort variable how can I test the variable to see that it is present or has a valid value.
So in my code I have:
.h file
--------
SerialPort^ sp;
.cpp file
---------
if(sp) //Testing to see if 'sp' has already been assigned a value.
{
if(sp->IsOpen)
sp->Close();
}
sp = gcnew SerialPort("Com1");
Any idea how to check to see if an Object handle has been assigned?
Thanks,
George
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...sp=nullptr;
if (sp==nullptr)
{
dosometing;
}
alse,you can do like this
..sp;
if (sp==nullptr)
{
dosometing;
}
in the c++/cli,the default object is equal to "nullptr".
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Hello!
A week ago, I dealed with programming my first camera-control(live rendering). I never did something like that, so I read a lot. Because I`d like to handle with the .NET-platform without changing to C#, I started coding in C++/CLI. My problem is, dispite all that studing books, forums and so on, I still don`t know exactly how to react. There seems to be endless possibilities to get your camera-data on your screen. One option is to operate with the old-school device-contexts, like you know them from MFC-programming(but I want to code in the new syntax, so the old MFC-syntax is not my favourite). Another idea is to operate with streams. I think it`s obvious to work with streams, `cause what you receive is a flow of byte-values composing the single frames. Sounds easy, but I don`t really know how to realize it exactly. Acting Try-and-error didn`t help. So, next option is to create a Bitmap and to copy the byte-values of every frame with die interop::marshal::copy-method into the Bitmap. But doing that copy-method 15 times in a second doesn`t seem to be the right way. Searching for a advisable method, I found DirectShow. My problem is, that I´m quite a rookie in programming. I know some basics in C++, but my knowledge and experience are limited. So I avoid programming DirecX(DirectShow), cause after studing the msdn-help, it seems to me, that DirectShow is a section for itself.
So, what would you do? What would you advice me? I`m very grateful for every piece of advice or literatur and veryveryvery grateful for any code-snippet.
Thanks for your help!
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I am building an application where I want to use some kinda autosave function.
I found a post about using threads but I cannot find a way to get it working...
Currently I have this:
LoadFiles() will get run at the beginning of the application. Here should the autosave thread be started...
public: Threading::Thread thd = new Thread(new ThreadStart(autoSave));
private: System::Void LoadFiles(void) {
Threading::Thread::Start();
}
private: System::Void autoSave(void) {
Threading::Thread.Sleep(5000);
}
And getting the following errors:
1>d:\app2\app2\Form1.h(424) : error C3845: 'App2::Form1::thd': only static data members can be initialized inside a ref class or value type
1>d:\app2\app2\Form1.h(58) : error C2512: 'System::Threading::Thread::Thread' : no appropriate default constructor available
1>d:\app2\app2\Form1.h(426) : error C2352: 'System::Threading::Thread::Start' : illegal call of non-static member function
1> c:\windows\microsoft.net\framework\v2.0.50727\mscorlib.dll : see declaration of 'System::Threading::Thread::Start'
1>d:\app2\app2\Form1.h(429) : error C2143: syntax error : missing ';' before '.'
1>d:\app2\app2\Form1.h(429) : error C2143: syntax error : missing ';' before '.'
1>Build log was saved at "file://d:\App2\App2\Release\BuildLog.htm"
Does anyone have any idea how to solve this OR how to make a better thingy? :p
Kind regards,
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try as following
public: Threading::Thread ^thd = gcnew Thread(new ThreadStart(autoSave)); private: System::Void LoadFiles(void) {
thd->Start();
}
private: System::Void autoSave(void) { Threading::Thread.Sleep(5000);
}
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1>d:\app2\app2\Form1.h(425) : error C3845: 'App2::Form1::thd': only static data members can be initialized inside a ref class or value type
1>d:\app2\app2\Form1.h(428) : error C2143: syntax error : missing ';' before '.'
1>d:\app2\app2\Form1.h(428) : error C2143: syntax error : missing ';' before '.'
But I corrected Threading::Thread.Sleep(5000); to Threading::Thread::Sleep(5000); which resolved those errors. Now Im still left with C3845.
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