Managed C++/CLI

Re: Convert From C# To Visual C++ 2015

16-Dec-21 22:14

hi Richard Deeming, Sorry & Thank for the advise and the reason is Visual C++/CLR doesn't support LINQ.

I do remember all your advises are powerful & good. Your replies helped many times while I get struck.

Thank Again !
Rose | [Rose]

Richard MacCutchan13-Dec-21 22:58

XmlLite: A Small And Fast XML Parser For Native C++ | Microsoft Docs[^]

13-Dec-21 22:58

Re: Convert From C# To Visual C++ 2015

Paramu197316-Dec-21 22:35

Re: Convert From C# To Visual C++ 2015

16-Dec-21 22:35

Thank Richard

Dave Kreskowiak14-Dec-21 6:05

Dave Kreskowiak

14-Dec-21 6:05

Stop focusing on C# code and start focusing on learning to write your own C++ XML code from scratch. You'll learn a lot more that way.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

openFileDialog - AccessViolationException was unhandled

Paramu19734-Oct-21 13:28

Re: openFileDialog - AccessViolationException was unhandled

4-Oct-21 13:28

Hi,
Iam using Vs2015, While I try to Open a file using OpenFileDialog, Iam receiving the error

"Unhandled exception of type" System.AccessViolationException" occoured in system.windows.forms.dll
Additional information: Attempted to read or write protected memory.This is often an indication other memory is currupt.

My Codes

System::Windows::Forms::OpenFileDialog^ MyFileOpenDialog = gcnew System::Windows::Forms::OpenFileDialog();
MyFileOpenDialog->Title = "Select Your Excel Test File";
MyFileOpenDialog->InitialDirectory = "C:\\";
MyFileOpenDialog->Filter = "Excel Files (*.xls)|*.xls|All files (*.*)|*.*";
MyFileOpenDialog->FilterIndex = 2;
MyFileOpenDialog->RestoreDirectory = true;
if (MyFileOpenDialog->ShowDialog() == System::Windows::Forms::DialogResult::OK) {
    MyExcelFile = MyFileOpenDialog->FileName;
}

I cannot understand my mistake !
Thanks For the helps! Thumbs Up | :thumbsup:

Richard pls. advise me! Thank again !

modified 5-Oct-21 2:59am.

Victor Nijegorodov5-Oct-21 22:26

Re: openFileDialog - AccessViolationException was unhandled

5-Oct-21 22:26

Answered in CG Forum: openFileDialog - AccessViolationException was unhandled

Paramu19736-Oct-21 4:17

Convert/cast System::Array class to List

6-Oct-21 4:17

Thank Victor Rose | [Rose]

yehiga146710-Jun-21 18:51

Re: Convert/cast System::Array class to List

10-Jun-21 18:51

How do I convert array to list?

array<System::Byte>^ My1DArray = gcnew array<System::Byte>(100);

List<System::Byte>^ temp

temp = My1DArray.ToList(); //doesn't work

Update:

I am currently using a for loop to copy data 1 by 1, if there's no other faster way ,i'll stick with this for now . Thanks!

array<System::Byte>^ My1DArray = gcnew array<System::Byte>(100);

int^ bytesToRead = gcnew(int);
*bytesToRead = SerialPort->BytesToRead;
SerialPort->Read(My1DArray, 0, *bytesToRead);
SerialPort->DiscardInBuffer();

List<System::Byte>^ temp = gcnew List<System::Byte>;

int^ counter = gcnew (int);
for (*counter = 0; *counter < *bytesToRead; (*counter)++) {
    temp->Add(My1DArray[*counter]);
}

modified 11-Jun-21 1:53am.

Victor Nijegorodov10-Jun-21 21:27

Re: Convert/cast System::Array class to List

10-Jun-21 21:27

why do you care about any "other faster way"?
How long is/are the array(s) to be converted? How often are you going to convert it/them?

Richard Andrew x6427-Jun-21 7:52

Richard Andrew x64

27-Jun-21 7:52

Why are you using int's through handles and gcnew?

Why don't you just say

C++

Int32 bytesToRead = 0;
Int32 counter = 0;

The difficult we do right away...
...the impossible takes slightly longer.

C# and c++/cli problem on x86 OS

Duc Axenn30-May-21 11:25

Duc Axenn

30-May-21 11:25

Hi,
i made a library in c++/cli and beside a c# program calling it. Everything works fine when i compile on any cpu or x64 on my pc (x64os/x64proc). But if i compile for x86, c# part works fine, but when i use the c++/cli part i get the error "could not load file or assembly .... incorrect format" . I use user32.lib in the c++/cli, is it possible the problem come from here ?

---- Edit
I think it's ok, i activated copy reference to output project but i'm not sure it was that.

modified 30-May-21 17:11pm.

Re: C# and c++/cli problem on x86 OS

Dave Kreskowiak10-Jun-21 19:51

Dave Kreskowiak

10-Jun-21 19:51

When you get a message like that, one project is compiling for either 32 or 64 bit and the other project is compiling for the opposite.

If the target is "Any CPU", a project will compile so that if the code runs on a 64-bit machine, it'll run as a 64-bit process, and if on a 32-bit machine, as a 32-bit process.

To solve this, make sure both projects build as either x64 or x86. Which depends on your requirements, but both projects have to build targeting the same thing.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Managed c++ how to memcpy a handle reference

yehiga146728-May-21 0:25

28-May-21 0:25

how do you copy the bytes of a managed variable to another managed variable? memcpy doesn't work since my arguments are not the correct type for memcpy

#include "string.h" //Updated Solution
    float^ f = gcnew (float);
    unsigned int^ temp = gcnew(unsigned int);
	*temp = 0;
	*temp = _byte3;
	*temp = (*temp << 8U) + _byte2;
	*temp = (*temp << 8U) + _byte1;
	*temp = (*temp << 8U) + _byte0


//	memcpy(f, temp,4U); //error


//Updated solution : 

		pin_ptr<float> pinPtr_FloatVal = &(*f);


		pin_ptr<unsigned int> pinPtr_UintVal = &(*temp);


	memcpy_s(pinPtr_FloatVal , 4U, pinPtr_UintVal , 4U); //4U i.e. 4 bytes

modified 28-May-21 8:32am.

Victor Nijegorodov28-May-21 1:25

c++ cli - Memcpy of native array to managed array in C++ CLI - Stack Overflow

28-May-21 1:25

yehiga146728-May-21 1:55

28-May-21 1:55

Hello, I am trying to memcpy two managed values. The link provided seem to be for unmanaged to managed?

Could you show an example how to achieve this? Thanks!

Victor Nijegorodov28-May-21 2:45

28-May-21 2:45

Are you banned by Google? Confused | :confused:

memcpy in managed c /cli - Google Search

modified 28-May-21 8:00am.

Richard MacCutchan28-May-21 3:01

28-May-21 3:01

The link that Victor gave you shows how to get a pointer to a managed object in order to copy data into it. So all you need is two such pointers in order to copy managed to managed.

yehiga146728-May-21 3:26

28-May-21 3:26

Thank you very much Richard for elaborating a bit on this! I have solved my problem !

How to make Serial Port static from the designer?

Fly Gheorghe25-Jan-22 10:15

Fly Gheorghe

25-Jan-22 10:15

//Assuming int is on 4 bytes
typedef union u
{
int i;
byte b[4];
} U;

U x;
x.b[0] = 0 // Put first byte here
x.b[1] = 0 // second byte here, etc.

// Then use x.i as an integer

// Keep in mind that on Intel CPUs, integer values are represented in memory in reverse order.
// This means that hex value 0x11223344 will be represented in memory as 0x44, 0x33, 0x22, 0x11
// This is called little-endian vs. big-endian representation.
// There can be CPUs that uses the other convention.

// Make a small test project and play around with some values etc.

yehiga146726-May-21 18:11

Re: How to make Serial Port static from the designer?

26-May-21 18:11

Hello all, my code requires the Serial Port to be static. Each time I make changes to the UI, I have to manually set the Serial Port to static.

like this

private: System::IO::Ports::SerialPort^ mySerialPort;

to this

private: static System::IO::Ports::SerialPort^ mySerialPort;

Is there a way to automatically be static?

Richard MacCutchan26-May-21 22:14

Re: How to make Serial Port static from the designer?

26-May-21 22:14

Add it to your class manually rather than in the designer.

yehiga146726-May-21 22:18

Re: How to make Serial Port static from the designer?

26-May-21 22:18

Thanks I have been adding the static keyword manually. But do you know if there is a way to automatically do this?

Richard MacCutchan26-May-21 22:59

Managed c++ float/double/integer to String and vice-versa?

26-May-21 22:59

I have never tried, but I would not expect so. If you drag a control onto a form in the designer then the designer adds it to the Form's properties. But there is nothing (at least in C# Forms) that I can see that allows you to modify it to be static.

yehiga146725-May-21 23:46

Re: Managed c++ float/double/integer to String and vice-versa?

25-May-21 23:46

Hello,

I am trying to display float/double/integer to a string with custom format in Label. But I couldn't find snprintf available in managed c++. How can I achieve this?

Victor Nijegorodov26-May-21 0:05