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I'm somewhat new to managed c++, so I would like a little clarification.
We have a large codebase of unmanaged c++ that runs as a plugin in another application (VS2002 rocks/NOT). The plugin world has it own coding rules and libraries that we have to use.
We are in the process of writing about 300K lines of code and are looking at c# just for the productivity enhancements. Also, they do not all have to run in the plugin.
My question is, is it possible with managed C++ to create a COM object that will link some these C# DLL's with are existing plugin code? This would be a huge help if it is not hard.
Thanks in advance.
Tom
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You don't need C++/CLI to write a COM object, but if you use C++/CLI, you don't need to use COM, you can use .NET to get finer grained access to the C# objects you've written.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Just to clarify, I can use c++/CLI to link my existing base of unmanaged code developed with VS2002?
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You'd want to modify your existing app to also use C++/CLI, then, yes. That doesn't mean changing all your code, you just add C++/CLI support.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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How can I retrieve data from datagridview on a row that I click on ?
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You can try
Void dataGridView1_CellContentClick(System::Object^ sender, System::Windows::Forms::DataGridViewCellEventArgs^ e) {
String^ strVal = dataGridView1->Rows[e->RowIndex]->Cells[0]->Value->ToString();
}
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Thanks Sir; It's Work Very well. But The event Cell_click is good for what I need.
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Hi 
I injected a DLL into another process. So far, it works fine.
Now I'd like to send messages to the DLL ... I'tried PostMessage but it always returns ERROR_INVALID_THREAD_ID
The code looks like this:
<br />
CreateRemoteThread(hProc, NULL, NULL, (LPTHREAD_START_ROUTINE)LoadLibAddy, (LPVOID)RemoteString, NULL, &ThreadId); <br />
<br />
while(!PostThreadMessage(ThreadId, WM_MYMSG, NULL, NULL))<br />
{<br />
if(GetLastError() == ERROR_INVALID_THREAD_ID)<br />
break;<br />
else Sleep(500);<br />
}<br />
and the DLL loops until a message is received (so it loops infinitivly atm )
<br />
while(1)<br />
{<br />
if(GetMessage(&msg, NULL, 0, 0))<br />
break;<br />
}<br />
thanks in advance !
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You could get the injected DLL to take over the main window's message procedure and handle that yourself..? You could then just send messages from your other application to the application with the DLL injected into it, which the DLL would handle..
Hope this helps!
--PerspX
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How could I write a simple utility that when Control + Shift clicking a folder would bring up a small text box next to the folder. In there I can type a search query, hit enter and it would then search the folder's contents?
Results would pop up in a new explorer window as if I did a Windows search.
Windows search sucks I need something quick and easy!
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btw, not sure if this is the right place for this post.. if it isn't please let me know
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Hoi there,
i need some help with an ActiveX Control under VC++ .Net
The Method is defined as:
UploadBuffer(VARIANT* VarPBuffer).
After using the Wizzard i got a Windows Form and a Wrapper Class for the control with the following signature:
public short UploadBuffer(ref object VarPBuffer)
and ILDasm shows UploadBuffer:int16(Object&)
Now here's the problem 
I got an array of unsigned chars which need to be transfered to the activex controll buffer. In VC++ with MFC this was done this way:
COleVariant *m_Buffer;
CByteArray *m_Array;
...
...
m_Array = new CByteArray;
m_Array->SetSize (1024 * 768);
m_Buffer=new COleVariant (*m_Array);
How do i get this thingie working under .Net ;/ It's realy driving me crazy (And no i can't just recompile the ocx because its comercially sold and the source code is not available)
I hope someone is able to help me
Thx.
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Hello,
The following code snippet invokes a function by its name.
It works fine but the function's name and its arguments must be used separately.
What I would like to do is to type in my function from an edit control as it is defined
E.g. MyFunc(arg1, arg2).
But before invoking it, I assume that I must parse it to get its name and arguments separately.
So I am wondering if Dot.Net framework provides either a parsing method that will easily split the function name and the arguments or better an invoke method where I can just pass my function in one shot with all its arguments?
Could you please help me to find a straightforward solution?
<br />
Object* CInvoker::InvokeMethod(String* method, Object* args[])<br />
{<br />
<br />
Module* module[] = Assembly::GetExecutingAssembly()->GetModules(false);<br />
<br />
CExternal* objexternal = new CExternal();
Type* typExternal = module[0]->GetType("CExternal");<br />
MethodInfo* methodinf = typExternal->GetMethod(method);<br />
Object* ret = methodinf->Invoke(objexternal, args);<br />
return ret;<br />
<br />
}<br />
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Hello all,
Can someone point out the difference between these
two HelloWorld programs ? I don't get why one uses the
'using' statement and i don't get the '.h'
(i'm trying to move from C# if that helps)
*************** -- 1
<br />
#include <iostream.h><br />
#include <stdlib.h><br />
<br />
int main() {<br />
<br />
cout << "Hello, World!" << endl;<br />
system("pause");<br />
<br />
return 0;<br />
<br />
}<br />
*************** -- 2
<br />
#include "stdafx.h"<br />
#include <iostream><br />
using namespace std;<br />
<br />
int _tmain(int argc, _TCHAR* argv[])<br />
{<br />
cout << "Hello World!" << endl;<br />
system("pause");<br />
<br />
return 0;<br />
}<br />
Thanks
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This is a C++/CLI forum, your question is off topic here.
As you didn't check "Ignore HTML tags in this message (good for code snippets)" I cannot read all your code, but I suspect that one includes iostream.h and the other includes iostream. iostream.h is not standard C++, the latest Microsoft compiler will reject attempts to use it.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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In addition to Christian's reply...
Please post non-managed-c++ questions on the appropriate board.
The "using namespace std;" line...I'll quote from the docs:
"The using directive allows the names in a namespace to be used without the namespace-name as an
explicit qualifier. Of course, the complete, qualified name can still be used to improve
readability."
cout and endl are in the std namespace. Without the using directive you'd have to specify the
namespace:
std::cout << "Hello World!" << std::endl;
Mark
"Go that way, really fast. If something gets in your way, turn."
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Mark Salsbery wrote: std::cout << "Hello World!" << std::endl;
Yeah, that's how I guessed what his hidden code was  )
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Christian Graus wrote: Yeah, that's how I guessed what his hidden code was
 Good reverse-source-engineering!
"Go that way, really fast. If something gets in your way, turn."
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Why is deque the only container where pointers and references to the data are not invalidated though iterators could be invalidated?
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Perhaps someone in the Visual C++ forums will answer this ?
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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I put many control on my form but in the field rate, amount what can I do so that it will be not possible to feed letters characters. With Visual c++ 6.0 MFC there was a class to do that but here, what to do ?
I learn my self
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HAndle the keypress event and reject inappropriate keys.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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PLease Sir,
I am looking how to habdle event in this version, I don't see. CAn you show me how to do it. I see only properties but evetI don't see.
Thanks
I learn my self
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Bring up the Properties editor. Click on the Event button at the top of the Properties editor window- the button with a lightning bolt as a symbol and the editor will show the events associated with the button
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This Solution to my problem
// Boolean flag used to determine when a character other than a number is entered.
private:
bool nonNumberEntered;
// Handle the KeyDown event to determine the type of character entered into the control.
void textBox1_KeyDown( Object^ /*sender*/, System::Windows::Forms::KeyEventArgs^ e )
{
// Initialize the flag to false.
nonNumberEntered = false;
// Determine whether the keystroke is a number from the top of the keyboard.
if ( e->KeyCode < Keys::D0 || e->KeyCode > Keys::D9 )
{
// Determine whether the keystroke is a number from the keypad.
if ( e->KeyCode < Keys::NumPad0 || e->KeyCode > Keys::NumPad9 )
{
// Determine whether the keystroke is a backspace.
if ( e->KeyCode != Keys::Back )
{
// A non-numerical keystroke was pressed.
// Set the flag to true and evaluate in KeyPress event.
nonNumberEntered = true;
}
}
}
}
// This event occurs after the KeyDown event and can be used to prevent
// characters from entering the control.
void textBox1_KeyPress( Object^ /*sender*/, System::Windows::Forms::KeyPressEventArgs^ e )
{
// Check for the flag being set in the KeyDown event.
if ( nonNumberEntered == true )
{ // Stop the character from being entered into the control since it is non-numerical.
e->Handled = true;
}
}
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