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norzss 2001-08-29
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ASSERTVALIDE(pobject)和ASSERT(pobject!=NULL)是一个意思
在debug下有效：就是结果为true程序继续运行，为false则跳出对话框，程序终止
在release下无效
在debug下有效：就是结果为true程序继续运行，为false则跳出对话框，程序终止
在release下无效
蒋晟 2001-08-29
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断言。
在调试的时候
ASSERT_VALID(pObject)
如果pObject指向的对象不合法时会弹出断言错误对话框。
ASSERT(bValue)
在bValue为假时会弹出断言错误对话框。
在调试的时候
ASSERT_VALID(pObject)
如果pObject指向的对象不合法时会弹出断言错误对话框。
ASSERT(bValue)
在bValue为假时会弹出断言错误对话框。
prog_st 2001-08-29
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ASSERT_VALID
ASSERT_VALID( pObject )
Parameters
pObject
Specifies an object of a class derived from CObject that has an overriding version of the AssertValid member function.
Remarks
Use to test your assumptions about the validity of an object’s internal state. ASSERT_VALID calls the AssertValid member function of the object passed as its argument.
In the Release version of MFC, ASSERT_VALID does nothing. In the Debug version, it validates the pointer, checks against NULL, and calls the object’s own AssertValid member functions. If any of these tests fails, this displays an alert message in the same manner as ASSERT.
Note This function is available only in the Debug version of MFC.
For more information and examples, seeMFC Debugging Support in Visual C++ Programmer’s Guide.
Example
// Assure that pMyObject is a valid pointer to an
// object derived from CObject.
ASSERT_VALID(pMyObject);
/////
ASSERT
ASSERT( booleanExpression )
Parameters
booleanExpression
Specifies an expression (including pointer values) that evaluates to nonzero or 0.
Remarks
Evaluates its argument. If the result is 0, the macro prints a diagnostic message and aborts the program. If the condition is nonzero, it does nothing.
The diagnostic message has the form
assertion failed in file <name> in line <num>
where name is the name of the source file, and num is the line number of the assertion that failed in the source file.
In the Release version of MFC, ASSERT does not evaluate the expression and thus will not interrupt the program. If the expression must be evaluated regardless of environment, use the VERIFY macro in place of ASSERT.
Note This function is available only in the Debug version of MFC.
Example
// example for ASSERT
CAge* pcage = new CAge( 21 ); // CAge is derived from CObject.
ASSERT( pcage!= NULL )
ASSERT( pcage->IsKindOf( RUNTIME_CLASS( CAge ) ) )
// Terminates program only if pcage is NOT a CAge*.
都是验证实例有效性.
ASSERT_VALID( pObject )
Parameters
pObject
Specifies an object of a class derived from CObject that has an overriding version of the AssertValid member function.
Remarks
Use to test your assumptions about the validity of an object’s internal state. ASSERT_VALID calls the AssertValid member function of the object passed as its argument.
In the Release version of MFC, ASSERT_VALID does nothing. In the Debug version, it validates the pointer, checks against NULL, and calls the object’s own AssertValid member functions. If any of these tests fails, this displays an alert message in the same manner as ASSERT.
Note This function is available only in the Debug version of MFC.
For more information and examples, seeMFC Debugging Support in Visual C++ Programmer’s Guide.
Example
// Assure that pMyObject is a valid pointer to an
// object derived from CObject.
ASSERT_VALID(pMyObject);
/////
ASSERT
ASSERT( booleanExpression )
Parameters
booleanExpression
Specifies an expression (including pointer values) that evaluates to nonzero or 0.
Remarks
Evaluates its argument. If the result is 0, the macro prints a diagnostic message and aborts the program. If the condition is nonzero, it does nothing.
The diagnostic message has the form
assertion failed in file <name> in line <num>
where name is the name of the source file, and num is the line number of the assertion that failed in the source file.
In the Release version of MFC, ASSERT does not evaluate the expression and thus will not interrupt the program. If the expression must be evaluated regardless of environment, use the VERIFY macro in place of ASSERT.
Note This function is available only in the Debug version of MFC.
Example
// example for ASSERT
CAge* pcage = new CAge( 21 ); // CAge is derived from CObject.
ASSERT( pcage!= NULL )
ASSERT( pcage->IsKindOf( RUNTIME_CLASS( CAge ) ) )
// Terminates program only if pcage is NOT a CAge*.
都是验证实例有效性.
