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I'm trying to create a .dll using ATL, which I want use in C#.
Can anybody please guide me to create a simple method / function which takes string in input parameters and returns the same(string)..
I tried a lot but always faced problem of returing string back to calling function in C#.
I did the same with C++ class library successfully but when it comes to ATL its not the same.
As I'm using other SDK API's in creation of .dll and I can't go with Class Library its having problem with "CLR and MTd". Which can't go together. Finally I decided to stick to ATL.
Now please guide me to create the methods which I can use in C# to get the string value.
Arun
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Use the below signature for the COM method. Then use RCW to call this method from .Net
[id(1)] HRESULT ReturnString([in,out] BSTR stringValue);
cheers....MIlton KB
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I have a 3th party dll writen in C. I have no problem calling most functions in the dll from the managed code. But there is a function that take a function pointer for setting a callback function that I am having problems with.
I have the following code:
First in a wrapper class
[DllImport("w32dll.dll")]
static void dllSetCallFp( void (*aFp)(void*) );
Then in seperate class.
delegate void funDelegate(void*);
typedef void (__cdecl *FUNPT)(void*);
funDelegate ^ fp = gcnew funDelegate(MFun);
pin_ptr<funDelegate^> pp = &fp;
IntPtr ip = Marshal::GetFunctionPointerForDelegate(fp);
FUNPT cb = static_cast<FUNPT>(ip.ToPointer());
Wrapper::dllSetCallFp(cb);
MFun is just a test function.
void Client::MFun(void* pV)
{
int i = 9;
}
The problem is I can debug into the calling of MFun but when I return I get the following errors
Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.
Then
'FatalExecutionEngineError'
Can anyone help me with this?
-Thanks
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Just a thought. Is it possible to use a function pointer directly, instead of marshalling from a delegate?
Best,
Jun
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Multidimension arrays
Read dozens of examples given on website how to do an single array with
the System::Array etc. But I can't get the hang of it how to use it properly.
I keep getting error messages when I hit the build button.
For example I want a simple 2 dimension array of the integer type.
in the old code it was:
int board[16][16];
board[3][3] = 5;
if i try to use the managed version:
array<int^,2>^ m_Board = gcnew array<int^,2>(16,16);
for (int row = 0; row < 16;row++)
{
for (int col = 0; col < 16;col++)
{
m_Board[row][col] = 0;
}
}
 I get error message on my screen.
Also I can't find anything about freeing the memory in the articles.
Is it neccessary if you use it in a class.
How do I free it if it's necessary?
Can I change the size of the area dynamically?
"Knowledge shouldn't be preserved by one, but shared with others."
-- Preminition
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I'm having a problem using the DataGrid/DataGridView within a MFC dialog (using the CWinFormsControl< > template).
I create a DataSet from a Xml file and then set it to the DataSource. I also set the DataMember to the appropriate table name, but nothing is displayed in the grid view. I tried other various approaches, but nothing seems to work.
I have no problem setting this up in WinForms - it won't work in MFC. I know the data's there because I can actually step right into it from the DataGrid object (debugger) - it just won't display - the ColumnCount is still 0.
What's the problem? Has anyone else experienced this?
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PlayerBalance is a String Data Type
Bet is a Int32 Data Type
I use this Conversation method
Bet = System::Int32::Parse(PlayerBalance); //Its OK
But This code not work; //error C2865: '<' : illegal comparison for handle type
if(Bet < 200)
{
MessageBox:Show("OK");
}
Best Regards...
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Hi,
Int32 is a value class, you probably used ^ there.
Int32 Bet; // should be fine
regards Tobias
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SOLUTION
Bet = System::Int32::Parse(PlayerBalance); OK
if(*Bet > 5) //Must be use *
{
MessageBox::Show("OK");
}
Thank you 2bee
Best Regards....
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How to Create Array of Labels on the Run-Time ?
Best Regards...
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Hello,
if you mean with "Label" a System::Windows::Forms::Label control
then you could use this snippet:
// an array of 10 Labels
array<Label^> myLabelArray = gcnew array<Label^>(10);
regards Tobias
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I try but error occur
error C3149: 'cli::array<type>' : cannot use this type here without a top-level '^'
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Sorry my fault, my thoughts were faster than my fingers:
(I forgot the '^' hat operator which classifies myLabelArray as a reference type)
array<Label^>^ myLabelArray = gcnew array<Label^>(10);
Tobias
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Thanks your help.
array<label^>^ myLabelArray = gcnew array<label^>(10); //Its work But
myLabelArray[0]->Location = Point(100,100); //NOT WORK
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Hi,
maybe my first statement lead you in the wrong direction.
array<Label^>^ myLabelArray = gcnew array<Label^>(10);
This line just creates an array with 10 references of the type Label.
A reference type is implicitly initialized with a nullptr, thus myLabelArray[0]->Location = Point(100,100); will not work unless you initialize it first.
// will work
lab[0] = gcnew Label();
lab[0]->Location = Point(10,10);
You should also use try-catch to catch exceptions that possibly occur.
regards Tobias
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No Error Occur But I Can't See Label on the Form
array<label^>^ myLabelArray = gcnew array<label^>(10);
myLabelArray[0] = gcnew Label();
myLabelArray[0]->AutoSize = true;
myLabelArray[0]->Location = System::Drawing::Point(100, 10);
myLabelArray[0]->Name = L"lblX";
myLabelArray[0]->Size = System::Drawing::Size(63, 13);
myLabelArray[0]->Text = "HELLO";
myLabelArray[0]->TabIndex = 50;
myLabelArray[0]->Visible = true;
Best Regards
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Hi,
you forgot to add the label to the form.
private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e) {
array<Label^>^ myLabelArray = gcnew array<Label^>(10);
myLabelArray[0] = gcnew Label();
myLabelArray[0]->AutoSize = true;
myLabelArray[0]->Location = System::Drawing::Point(100, 10);
myLabelArray[0]->Name = L"lblX";
myLabelArray[0]->Size = System::Drawing::Size(63, 13);
myLabelArray[0]->Text = "HELLO";
myLabelArray[0]->TabIndex = 50;
myLabelArray[0]->Visible = true;
this->Controls->Add(myLabelArray[0]);
}
};
regards Tobias
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It's work, thanks a lot 2bee...
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I am not sure if I am posting in the right area, but I am looking for STI resources. I heard that WIA is just a wrapper for STI, however WIA 2.0 doesn't work with older Windows versions. Any C++/C/C# or other .NET supported language resources for STI is what I am seeking. Thanks a lot.
I love to program!
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What are STI and WIA?
- It's easier to make than to correct a mistake.
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STI is still image architecture. It's a way to access digital cameras. WIA is Windows Image Acquisition. It's also another way to access digital cameras. My problem is WIA doesn't work on all operating systems where as TWAIN and STI will. I just need a way to access a digital camera on most operating systems (Windows 98 and above). Also, the digital camera does not mount as a drive or this would be a simple matter.
I love to program!
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**
The following was posted to the .NET foram, but few questions seem to be answered there.
I am no longer mad (upset) just tired. Being .NET seems to go automatically with managed, but one thing at a time.
**
This is driving me nuts! 
I am writing my first C++ .NET application and all I want to do is load a bitmap resource. Normally I would do something like ::LoadImage(IDB_BITMAP), but it says it is not in the global namespace. I want to load it as an Image type, but Image only has method for loading from a file or via a windows handle.
The code should look something like the following:
pImage->FromResource(IDB_BITMAP);ORpImage = resources->GetObject(IDB_BITMAP);
This should be simple!
Thanks for any help,
INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra
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Hello,
i found this article quite useful and it could help you in solving your issue.
However this article shows how to create resources (bitmaps etc.) and use them within a .Net program. I am not quite sure if this is actually what you want. Furthermore it is written in C# but on the other side, C# is easy to convert to C++/CLI.
http://www.jelovic.com/articles/resources_in_visual_studio.htm[^]
so it would be instead:
ResourceManager^ resourceManager = gcnew ResourceManager("MyCompany.MyProject.SomeResources", GetType().Assembly);
Bitmap^ image = (Bitmap^)resourceManager->GetObject ("MyBitmapName");
Hope this helps,
best regards Tobias
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