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Error C2065: (identifier) : undeclared identifier
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Table of contents
- 1. Cause
- 2. Solution
- 3. (ToDo)
- 4. About This Article
Cause
A variable's type must be specified in a declaration before it can be used. The parameters that a function uses must be specified in a declaration, or prototype, before the function can be used.
Possible causes:
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You may be calling a function in an SDK header file that is currently not supported in your build environment.
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Omitting necessary include files, especially if you define VC_EXTRALEAN, WIN32_LEAN_AND_MEAN, or WIN32_EXTRA_LEAN. These symbols exclude some header files from windows.h and afxv_w32.h to speed compiles. (Look in windows.h and afxv_w32.h for an up-to-date description of what's excluded.)
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Identifier name is misspelled.
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Identifier uses the wrong uppercase and lowercase letters.
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Missing closing quote after a string constant.
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Improper namespace scope. To resolve ANSI C++ Standard Library functions and operators, for example, you must specify the std namespace with the using directive. The following example fails to compile because the using directive is commented out and cout is defined in the std namespace:
Solution
Attack the problem according to one of the causes described above.
(ToDo)
Include a solution for each of the causes above. Code examples for both causes and solutions will make the article more clear.
About This Article
This article is a derivative work based on Compiler Error C2065 which is provided by MSDN Community Content - Visual C++.
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