Top 9 Getdc 0 The 145 New Answer

What is the difference between a GetDC() and GetWindowDC() call?

• Article author: www.equestionanswers.com
• Reviews from users: 36817 Ratings
• Top rated: 3.0
• Lowest rated: 1
• Summary of article content: Articles about What is the difference between a GetDC() and GetWindowDC() call? GetDC() function retrieves a handle to a display device context for the client area of a … 0, NULL, NULL, hInstance, NULL); ShowWindow(hWnd, nCmdShow); …
• Most searched keywords: Whether you are looking for What is the difference between a GetDC() and GetWindowDC() call? GetDC() function retrieves a handle to a display device context for the client area of a … 0, NULL, NULL, hInstance, NULL); ShowWindow(hWnd, nCmdShow); What is the difference between a GetDC() and GetWindowDC() call?
• Table of Contents:

GetDC()

GetWindowDC()

GetDC() GetWindowDC() drawing

GetDC GetWindowDC output

Read More

Calling getdc getpixel function in chrome browser – CodeProject

• Article author: www.codeproject.com
• Reviews from users: 5867 Ratings
• Top rated: 4.4
• Lowest rated: 1
• Summary of article content: Articles about Calling getdc getpixel function in chrome browser – CodeProject I would add error checking to make sure the FindWindow and GetDC calls … protected: PCSTR m_Text { nullptr }; size_t m_Length { 0 }; HWND … …
• Most searched keywords: Whether you are looking for Calling getdc getpixel function in chrome browser – CodeProject I would add error checking to make sure the FindWindow and GetDC calls … protected: PCSTR m_Text { nullptr }; size_t m_Length { 0 }; HWND … Free source code and tutorials for Software developers and Architects.; Updated: 4 May 2022Free source code, tutorials
• Table of Contents:

1 solution

Solution 1

Add your solution here

Preview 0

Read More

Excel 2003 VBA Programmer’s Reference – Paul T. Kimmel, Stephen Bullen, John Green, Rob Bovey, Robert Rosenberg – Google Sách

• Article author: books.google.com.vn
• Reviews from users: 5018 Ratings
• Top rated: 4.8
• Lowest rated: 1
• Summary of article content: Articles about Excel 2003 VBA Programmer’s Reference – Paul T. Kimmel, Stephen Bullen, John Green, Rob Bovey, Robert Rosenberg – Google Sách Updating …
• Most searched keywords: Whether you are looking for Excel 2003 VBA Programmer’s Reference – Paul T. Kimmel, Stephen Bullen, John Green, Rob Bovey, Robert Rosenberg – Google Sách Updating What is this book about? Excel 2003 VBA Programmer’s Reference is an updated and expanded version of the two previous editions now with a reference section downloadable from the Web for easy perusal. The book is aimed at Excel users who want to gain more control over their spreadsheets using VBA or who want to develop Excel applications for other users. The book starts with a primer chapter focused on bringing the readers up to speed with Excel and VBA. From there, the book expands to focus on major issues faced by advanced Excel users and developers. What does this book cover? In this book, you’ll discover how to do the following: Set up applications and convert them to add-ins Package and distribute Excel applications Set up interaction with other Office applications and databases Program the VB Editor and use the Windows API Use VB6 and VB.NET with Excel Set up internationalization Advanced debugging and error handling techniques
• Table of Contents:

Read More

An Introduction to Object-Oriented Programming in C++: with Applications in … – Graham M. Seed – Google Sách

• Article author: books.google.com.vn
• Reviews from users: 962 Ratings
• Top rated: 4.0
• Lowest rated: 1
• Summary of article content: Articles about An Introduction to Object-Oriented Programming in C++: with Applications in … – Graham M. Seed – Google Sách Updating …
• Most searched keywords: Whether you are looking for An Introduction to Object-Oriented Programming in C++: with Applications in … – Graham M. Seed – Google Sách Updating An Introduction to Object-Oriented Programming in C++ with applications in Computer Graphics introduces the reader to programming in C++ step by step from the simplest of C++ programs, through features such as classes and templates to namespaces. Emphasis is placed on developing a good programming technique and demonstrating when and how to use the more advanced features of C++ through the development of realistic programming tools and classes.This revised and extended 2nd edition includes:- the Standard Template Library (STL), a major addition to the ANSI C++ standard- full coverage of all the major topics of C++, such as Templates; exception handling; RTTI- practical tools developed for object-oriented computer graphics programmingAll code program files and exercises are ANSI C++ compatible and have been compiled on both Borland C++ v5.5 and GNU/Linux g++ v2.91 compilers, and are available from the author’s web site:http://www.hw.ac.uk/mecWWW/research/staff/gms.htm
• Table of Contents:

Read More

See more articles in the same category here: Chewathai27.com/to/blog.

GetDC function (winuser.h) – Win32 apps

Table of contents

GetDC function (winuser.h)

Article

10/13/2021

2 minutes to read

In this article

The GetDC function retrieves a handle to a device context (DC) for the client area of a specified window or for the entire screen. You can use the returned handle in subsequent GDI functions to draw in the DC. The device context is an opaque data structure, whose values are used internally by GDI.

The GetDCEx function is an extension to GetDC, which gives an application more control over how and whether clipping occurs in the client area.

Syntax

HDC GetDC( [in] HWND hWnd );

Parameters

[in] hWnd

A handle to the window whose DC is to be retrieved. If this value is NULL, GetDC retrieves the DC for the entire screen.

Return value

If the function succeeds, the return value is a handle to the DC for the specified window’s client area.

If the function fails, the return value is NULL.

Remarks

The GetDC function retrieves a common, class, or private DC depending on the class style of the specified window. For class and private DCs, GetDC leaves the previously assigned attributes unchanged. However, for common DCs, GetDC assigns default attributes to the DC each time it is retrieved. For example, the default font is System, which is a bitmap font. Because of this, the handle to a common DC returned by GetDC does not tell you what font, color, or brush was used when the window was drawn. To determine the font, call GetTextFace.

Note that the handle to the DC can only be used by a single thread at any one time.

After painting with a common DC, the ReleaseDC function must be called to release the DC. Class and private DCs do not have to be released. ReleaseDC must be called from the same thread that called GetDC. The number of DCs is limited only by available memory.

Examples

For an example, see Drawing with the Mouse.

Requirements

Minimum supported client Windows 2000 Professional [desktop apps only] Minimum supported server Windows 2000 Server [desktop apps only] Target Platform Windows Header winuser.h (include Windows.h) Library User32.lib DLL User32.dll

See also

Device Context Functions

Device Contexts Overview

GetDCEx

GetTextFace

GetWindowDC

ReleaseDC

WindowFromDC

[Solved] GetDC(0) only yields primary screen in Windows 10 (Linux is all OK)

Attached is a test desktop capture program. Gets an area based on the cursor position — the cursor points to the upper left corner, and the area is the size of the program window. No matter how many screens there are and where the cursor is — it always copies a visible part of the desktop. If the screens have different resolutions, the empty space is filled by the system with black color. However, the content outside the screens is not cleared by the system, so in the program I first fill the entire bitmap in white, and then the visible desktop fragment is copied.

In the attached picture you can see all three places — the main monitor ( LCD0 ), an additional monitor ( LCD1 ) and the empty space filled in black, resulting from the difference in resolution of both screens. In the second attachment is a Lazarus project of this program. Tested on Windows10. Have fun.

GetDC (0)

Forum

Visual C++ & C++ Programming

Visual C++ Programming

GetDC (0) Results 1 to 4 of 4 Thread: GetDC (0) #1 Join Date Mar 2001 Location The Hague – The Netherlands Posts 46 GetDC (0) Hi…

Following a previous section I posted a couple of days ago, I am still wondering how to get a bitmap copy of the windows screen.

I got an answer : Use GetDC(0) to get a handler on the screen but it seems quite tough to use in VC++ because, the GetDC function does not get any parameters.

I know my question can sound stupid but how to use GetDC in VC++ to get a handler on the Windows screen?

Thanks

F.

#2 Join Date Apr 2000 Location Aarhus (Denmark) Posts 126 Re: GetDC (0) Hi

You need to call the API function ::GetDC(HWND hWnd) not the CWnd::GetDC();

The scope resolution operator in front of ::GetDC(HWND hWnd) tells the compiler that we want the GetDC() function with global scope.

Hope this helps

Best regards

Bo Lovmand

Have a nice day 🙂 #3 Join Date Jan 2001 Posts 24 Re: GetDC (0) This is from MSDN help:

GetDC

The GetDC function retrieves a handle to a display device context for the client area of a specified window or for the entire screen. You can use the returned handle in subsequent GDI functions to draw in the device context.

The GetDCEx function is an extension to GetDC, which gives an application more control over how and whether clipping occurs in the client area.

HDC GetDC(

HWND hWnd // handle to a window

);

Parameters

hWnd

Handle to the window whose device context is to be retrieved. If this value is NULL, GetDC retrieves the device context for the entire screen.

Windows 98, Windows NT 5.0 and later: If this parameter is NULL, GetDC retrieves the device context for the primary display monitor. To get the device context for other display monitors, use the EnumDisplayMonitors and CreateDC functions.

Return Values

If the function succeeds, the return value identifies the device context for the specified window’s client area.

If the function fails, the return value is NULL.

Windows NT: To get extended error information, callGetLastError.

Remarks

The GetDC function retrieves a common, class, or private device context depending on the class style specified for the specified window. For common device contexts, GetDC assigns default attributes to the device context each time it is retrieved. For class and private device contexts, GetDC leaves the previously assigned attributes unchanged.

After painting with a common device context, the ReleaseDC function must be called to release the device context. Class and private device contexts do not have to be released. The number of device contexts is limited only by available memory.

QuickInfo

Windows NT: Requires version 3.1 or later.

Windows: Requires Windows 95 or later.

Windows CE: Requires version 1.0 or later.

Header: Declared in winuser.h.

Import Library: Use user32.lib.

This is a global function and u got to write it in this way:

::GetDC( ;

I hope it will be usefull for you.

#4 Join Date Mar 2001 Location The Hague – The Netherlands Posts 46 Re: GetDC (0) Thank you all for your precious information. Nevertheless, I have another issue…

Actually, I am trying to make a copy of the Windows screen as a bitmap. That’s why I wanted to use the GetDC(0) function. Here is the code I wrote:

**************************************************

HDC hDC = ::GetDC(0);

HDC memDC = CreateCompatibleDC(hDC);

HBITMAP memBM = CreateCompatibleBitmap(hDC, scrWidth, scrHeight);

SelectObject(memDC,memBM);

BITMAP bm;

CBitmap bmp;

::GetObject(memBM, sizeof(bm), &bm);

bmp.Attach(&bm);

**************************************************

The problem is that when I look at the bmp object, it appears that there is only one colour in the Bitmap (???), but the size seems alright. What’s wrong?

I wish to have a pointer on this ‘screen bitmap’ that is able to access each pixel of this bitmap. I also need to know the most common colour of this bitmap.

Then I am wondering if the solution is actually to work from a BMP file. In that case, How can I create a BMP file from the Windows screen?

Thank you in advance

Francois

Posting Permissions You may not post new threads

post new threads You may not post replies

post replies You may not post attachments

post attachments You may not edit your posts

edit your posts BB code is On

Smilies are On

[IMG] code is On

[VIDEO] code is On

HTML code is Off Forum Rules

So you have finished reading the getdc 0 topic article, if you find this article useful, please share it. Thank you very much. See more: CreateCompatibleDC, ReleaseDC, GetClientRect, BitBlt, GetDeviceCaps, TextOut, BeginPaint, DeleteDC