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Tom, just my 2 cents:
1. You are using CPaintDC: are you doing this inside processing WM_PAINT?
2. Your m_wndPhoto window may have empty invalidated region;
3. Shouldn't you be using CDC?
Cheers,
I
"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me
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<br />
void CBLOBDataDlg::DisplayImageFile(Byte pictureData __gc[])<br />
{<br />
#pragma push_macro("new")<br />
#undef new<br />
System::IO::MemoryStream* dataStream = NULL;<br />
Bitmap* image = NULL;<br />
Graphics* graphics = NULL;<br />
CClientDC dc(&m_wndPhoto);<br />
<br />
try<br />
{<br />
CWaitCursor wc;<br />
<br />
if (NULL != pictureData)<br />
{<br />
dataStream = new System::IO::MemoryStream(pictureData);<br />
<br />
image = new Bitmap(dataStream);<br />
graphics = Graphics::FromHdc(dc.GetSafeHdc());<br />
<br />
RECT clientRect;<br />
m_wndPhoto.GetClientRect(&clientRect);<br />
<br />
graphics->FillRectangle(SystemBrushes::Control, <br />
clientRect.left, clientRect.top,<br />
clientRect.right - clientRect.left,<br />
clientRect.bottom - clientRect.top);<br />
<br />
graphics->DrawImage(image, 0, 0, image->Width, image->Height);<br />
}<br />
else<br />
{<br />
graphics = Graphics::FromHdc(dc.GetSafeHdc());<br />
<br />
RECT clientRect;<br />
m_wndPhoto.GetClientRect(&clientRect);<br />
<br />
graphics->FillRectangle(SystemBrushes::Control, <br />
clientRect.left, clientRect.top,<br />
clientRect.right - clientRect.left,<br />
clientRect.bottom - clientRect.top);<br />
}<br />
}<br />
catch(Exception* e)<br />
{<br />
MessageBox::Show(e->Message, S".NET Exception Thrown", MessageBoxButtons::OK, MessageBoxIcon::Error);<br />
}<br />
__finally<br />
{<br />
if (graphics) graphics->Dispose();<br />
if (image) image->Dispose();<br />
if (dataStream) dataStream->Dispose();<br />
}<br />
#pragma pop_macro("new")<br />
}<br />
Cheers,
Tom Archer
Inside C#,
Extending MFC Applications with the .NET Framework
It's better to listen to others than to speak, because I already know what I'm going to say anyway. - friend of Jörgen Sigvardsson
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Is there anyway to convert a .Net String class or a __wchar_t __gc[] array to an unsigned char __gc[] array?
thanks
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Sample Code taken from the MSDN:
<br />
#include < stdio.h ><br />
#include < stdlib.h ><br />
#include < vcclr.h ><br />
#using < mscorlib.dll ><br />
using namespace System;<br />
<br />
int main()<br />
{<br />
String __gc* str = S"Hello";<br />
<br />
const wchar_t __pin* p = PtrToStringChars(str);<br />
printf("%S\n", p);<br />
<br />
char* ch = (char *)malloc((str -> Length + 1) * 2);<br />
wcstombs(ch, p, (str -> Length + 1) * 2);<br />
printf("%s\n", ch);<br />
}<br />
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I have a program which reads from an audio hardware device some raw image data. I am doing the reading in unmanaged C++, so I have in my managed C++ method a pointer to an unmanaged unsigned char array. I would like to load a bitmap object with this data so I can display the data by calling the DrawImage method on a Graphics object.
How can I transfer an unmnaged 512x1024 unsigned char array into a managed Bitmap object for display? If I dump this memory into a "raw" binary file, I can load the file into Photoshop as an interleaved raw format file.
thanks
Bryan
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Could you create a MemoryStream* and use it's Read method to fill the stream, then load an Image* object with it's FromStream method.
-Nick Parker
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But it looks like the Read method reads FROM the stream, and writes TO the buffer. It seems I should use the Write method to Write from the buffer into the Stream. But the problem is still that I need to Write unmanaged data into the Stream, and the Write method takes a managed array.
So I guess one question would be how can I convert my unmanaged array into a managed array so I can than use the Write method. My declaration of my array is as follows:
unsigned char __nogc *buffer = new unsigned char[1024*512];
but when I pass this into the Write method, I get a complier error saying the method expects a unsigned char __gc[], and not an unsigned char __gc*.
Thanks for any additional insight you can add.
Bryan
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When I use the debugger to step through my code, is there any way I can examine the memory pointed to by a String object? When I look at it in the watch window I cannot get the pointer value, likewise when I assign it to a wchar_t __pin * variable, the watch window will not let me access the value of the pointer (it will only show me the value pointed to). So I cannot bring it up in the memory window. Is there any work-around?
Thanks,
Jeremy
READIN writin rhythmetic
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I prepared a program that enumerate processes in the system in vc6.
now I'd like to show process start time by using Process.StartTime() in VC 7. For using Process.StartTime() function What must I do? Please define
me as you are describing to a new user of VC.
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Here is a *fun* problem:
How do you prototype a derived class?
To add some code to the situation:
This is what I want to do:
namespace ManagedConsoleXPControls
{
public __gc __abstract class ConsoleControlBase : public CollectionBase;
}
However, good 'ol VS 2003 gives me a nasty error:
c:\Projects\Windows Forms\Managed Console\MC - Console XP\MCXP-Prototypes.h(20): error C2143: syntax error : missing ',' before ';'
I'm quite certain that this error pertains to this single line in the code.
Does anyone have any bright ideas?
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Anonymous wrote:
namespace ManagedConsoleXPControls
{
public __gc __abstract class ConsoleControlBase : public CollectionBase;
}
namespace ManagedConsoleXPControls
{
public __gc __abstract class ConsoleControlBase : public CollectionBase{};
}
leppie::AllocCPArticle(Generic DFA State Machine for .NET);
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Let me try it, but I have the feeling it will cause a "Symbol redefinition" type error.
Even if it doesn't work, thank you dearly for replying 
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Yep, it causes a "'class' type redefinition error" due to the fact that declaring it that way is basically saying ConsoleControlBase is an empty class. Humbug.
Thanks anyway.
Anyone else know how to do this? There has to be some way....
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Why do you insist on including the inheritance in the prototype? In C++ you don't do that.
--
You know me. I sure know you.. Everyone of you!
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is there any chance to writ apps for win98 with C++.NET and win2000pro?
thanks.
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Yes, there is. As long as you don't use external technologies that need OS's higher than Windows 98, you'll be alright. The .NET Framework works with Windows 98 and up.
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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I have some problems whith the splitters. In design time it's O.K. But the problems start at run time, when I create some child Forms by code and I try to dock them inside a new splitter but it's impossible, the splitter ignores the correct order (it´ss been generated later than the Form child) and does not include the new child form inside. It's like the Form child is not treated like another design control inside the main Form.
Please, can anybody help me about the treatment and placement of splitters controls in run time with Windows Forms?
Thank you.
Raf.
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Hi
I am looking for a free library that can skin my Form and buttons and everything. I have found some options for MFC and other things but want something for forms. Is it even possible?
thanks
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It is possible. Take a look at this[^]. It's a project we are doing to make skinnable GUI components and controls for .NET and Win32.
"Blessed are the peacemakers, for they shall be called sons of God." - Jesus
"You must be the change you wish to see in the world." - Mahatma Gandhi
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I'm a newbie on the "managed" topic. Has anybody an experience on sending a gdiplus::Image reference to a managed function ?
My unmanaged function would look like that:
void foo( gdiplus::Image& image_);
Jonathan de Halleux.
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Hello.
I'm a beginner in working with Managed C++ and I have a question.
I have read that it's possible to mix managed and unmanaged code in the same application, and I have been testing this.
I have created a simple Windows Form application and do some little things.
Then I have tryed to use a class that's its written in unmanaged C++ that make some things with CStrings.
After I have compiled this file ( I only added some includes to make it work ) I tried to use some functions of this class in my form file.
So when I added the include to this class, and build the application some error messages appear like this:
" error C2039: 'GetObjectA' : is not a member of 'System::Resources::ResourceManager'
stdafx.cpp(0) : see declaration of 'System::Resources::ResourceManager' "
In the error line the code that the Visual Studio wizard wrote it's this :
"this->imageList1->ImageStream = (__try_cast<system::windows::forms::imageliststreamer *="">(resources->GetObject(S"imageList1.ImageStream")));"
As you can see there is not GetObjetA call, instead its GetObject.
Any idea ? Thanks. 
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Hi
I had this same question earlier and someone told me that linkers are stupid. That's what I'll tell you because I am a newbie. The solution to your question is to undefine GetObject like so:
#undef GetObject
If you use System::Windows::Forms::MessageBox you will also need to undefine it.
Hope that helped and if anyone could explain why this is that would be great.
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Since you're using CString in your umanaged project you're using MFC. Throught the MFC library there are many #defines in order for code to be compiled using either Ascii characters or Wide characters. When you complie your code the library will check what type of strings you should be compiling for and will then use the appropriate function. For you it was "GetObjectA" meaning your code was trying to compile using 16bit characters. You have to do it for the message box as well because it has both MessageBoxA and MessageBoxW functions so it can complie using either Ascii or Wide strings.
I hope that made some sense.
I'm not sure if that's completely right, as I'm not a pro programmer or anything.
- monrobot13
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I'm not sure on the .net stuff still learning it myself. But from an MFC perspective xxxA is ascii ie 8bit chars whilst xxxW is unicode ucs16 ie 16bit characters. The normal way to control this is with a preprocessor define of MBCS or UNICODE. (MultiByteCharSet is just ascii 8bit characters with an escape character defined to encode further characters with a second 8bit character)
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