[英]What does IDC_STATIC means in a resource.h file?
I have a simple Win32 project generated by VS 2012. In the resource.h
file, I saw this:我有一个由 VS 2012 生成的简单 Win32 项目。在
resource.h
文件中,我看到了这个:
#ifndef IDC_STATIC
#define IDC_STATIC -1
#endif
I found it is been referenced in a couple places in the resource.rc
file.我发现它在
resource.rc
文件中的几个地方被引用。 But I could not understand what it means.但我无法理解这意味着什么。 Neither did I find reference about it online.
我也没有在网上找到有关它的参考。 Any idea?
有什么想法吗?
When creating child controls by calling CreateWindowEx
, you have to assign a control ID (through the overloaded hMenu parameter).通过调用
CreateWindowEx
创建子控件时,您必须分配一个控件 ID(通过重载的hMenu参数)。 The control ID can later be used to refer to a control, without having to store the dynamically created HWND
(eg when calling GetDlgItem
or GetDlgItemInt
).以后可以使用控件 ID 来引用控件,而不必存储动态创建的
HWND
(例如,在调用GetDlgItem
或GetDlgItemInt
)。
Some controls rarely need to be identified in code.有些控件很少需要在代码中标识。 A prominent example is the Static Control 1 , that, if defined in a resource script, usually does not need to be referenced in code.
一个突出的例子是静态控件1 ,如果在资源脚本中定义,通常不需要在代码中引用。 You (or the dialog manager) still need to pass a control ID when creating the control, even though you don't use it later on.
您(或对话框管理器)在创建控件时仍需要传递控件 ID,即使您以后不使用它。 For those controls you can pass the
IDC_STATIC
control ID, that is defined in a wizard-generated Resource.h
file 2 .对于这些控件,您可以传递
IDC_STATIC
控件 ID,该 ID 在向导生成的Resource.h
文件2 中定义。
1 Other examples include the Icon Control (a static control with the SS_ICON
style), the Line Control (a static control with the SS_ETCHEDHORZ
and SS_SUNKEN
styles), or the GroupBox Control . 1其他示例包括图标控件(具有
SS_ICON
样式的静态控件)、 行控件(具有SS_ETCHEDHORZ
和SS_SUNKEN
样式的静态控件)或GroupBox 控件。
2 This is not a convention of the Windows API 3 . 2这不是 Windows API 3的约定。 It is strictly a decision made by user code.
这严格是由用户代码做出的决定。 You could use another ID value, or not define
IDC_STATIC
at all if you want, and use an integer literal in the LTEXT control statement instead: LTEXT "Filename", -1, 10, 10, 100, 100
如果需要,您可以使用另一个 ID 值,或者根本不定义
IDC_STATIC
,而在LTEXT 控制语句中使用整数文字: LTEXT "Filename", -1, 10, 10, 100, 100
3 Granted, the SDK header winres.h
does define the preprocessor symbol IDC_STATIC
as (-1)
, so if you do define it in your code, make sure to assign the same value to avoid any confusion. 3当然,SDK 头文件
winres.h
确实将预处理器符号IDC_STATIC
定义为(-1)
,因此如果您在代码中定义它,请确保分配相同的值以避免任何混淆。
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