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When writing the program, the author forgot to write the function name, 'memcmp'.
The analyzer detected a direct call to the destructor for this object.
An extended exception is generated.
BSTRs are allocated using COM memory allocation functions, so they can be returned from methods without concern for memory allocation.
It is very strange, and this code is very likely to be incorrect.
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Download ngenuity ultimate versionBut there is no apparent error either.
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Download ngenuity ultimate versionAlso, keep in mind that the analyzer can't tell for sure if there is a real error in the code or not.
To fix this error, we need to remove incorrect code or adjust the code according to the memory management model used.
If an incorrect BSTR string is passed somewhere outside the code, it will cause a failure.
Download ngenuity ultimate versionWhen an object is created on the stack, the destructor will be called when the object leaves the scope.
The result of such change is unpredictable.
Download ngenuity ultimate versionThat's why memory can be allocated only using functions malloc() or realloc().
The analyzer detected a suspicious function where one of the parameters is never used while another parameter is used several times.
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When fixed, it won't bewilder the programmer maintaining the code, and neither will it trigger the analyzer's warning.
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What is the difference between memmove and memcpy?
In this code, the programmer is trying to store an object of size 16 bytes in the 'buf' buffer of size 12 bytes.
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Download ngenuity ultimate versionMSDN documentation, but we'll have to.
Executing these two operations will result in a null value regardless of the initial value of the 'A' variable.
Download ngenuity ultimate versionWhen using this object, the memory outside the buffer bounds will be changed.
You can look at examples of errors detected by the V743 diagnostic.
This code builds (compiles and links) correctly, but it will not function properly because the string does not have a length prefix.
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Download ngenuity ultimate versionChanging a temporary object.
Download ngenuity ultimate versionThe analyzer detected a suspicious expression in parentheses consisting of various variables and values separated by commas.
Download ngenuity ultimate versionInstead, it receives a pointer to an ordinary string.
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Download ngenuity ultimate versionAs you see, the function expects, as its first argument, a pointer to a variable referring to the address of a BSTR string.
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Download ngenuity ultimate versionTo avoid bugs like that, make sure you name objects you're creating.
The pointer now refers somewhere to the middle of the string instead of its first character.
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Download ngenuity ultimate versionCopying 40 bytes from the source into the destination will lead to partial overlapping of the source memory block.
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Download ngenuity ultimate versionIt is much better and safer to catch exceptions by reference.
You can look at examples of errors detected by the V751 diagnostic.
Download ngenuity ultimate versionThat's why the analyzer doesn't always output the warning about commas inside parentheses.
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If getline() needs more storage than that already allocated, it will call the realloc() function.
Download ngenuity ultimate versionMore specifically, the previous characters will be interpreted as the string length.
Download ngenuity ultimate versionThe analyzer detected an error that has to do with the programmer forgetting to name a newly created object.
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In this code, a function that should return the length of a string receives a pointer to variable 'a'.
Download ngenuity ultimate versionIn practice, however, it doesn't make sense and will cause a runtime error.
Firstly, some of the information about the exception will get lost; everything stored in Exception_Ex won't be available anymore.
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Download ngenuity ultimate versionAvoiding Common Problems in Coding and Design.
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Download ngenuity ultimate versionWe do not recommend writing complex expressions like this because it is going to make it difficult for your colleagues to read such code.
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Download ngenuity ultimate versionIn this case, the result is a null value, too.
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Download ngenuity ultimate versionBSTR must always refer to the first character of the string; if you shift the pointer by at least one character, you'll get an invalid BSTR string.
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We also recommend reading the sources mentioned at the end of the article: they will help you figure out what BSTR strings are all about and how to cast them to strings of other types.
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In this example, the programmer wanted to make sure that the execution of the foo() function would be synched, but actually it will be called without synching, and it may cause serious errors.
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Download ngenuity ultimate versionTrue, this is a false positive, but the analyzer is technically correct when issuing the warning.
Download ngenuity ultimate versionThe analyzer detected that inadmissible operations are executed over a BSTR string.
Download ngenuity ultimate versionIn this code, the destructor for the 'a' object is called directly.
Download ngenuity ultimate versionIn this code, memory for the function getline() is allocated using the new operator.
Download ngenuity ultimate versionTo figure out why such string handling is dangerous, let's first recall what the BSTR type is.
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The value '0' is of type 'int', so the exception to be thrown will also be of type 'int'.
This code probably contains an error, and the programmer needs to check the correctness of the constants used.
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The result of such call is unpredictable.
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The virtual function Print() will only allow printing the basic information about the exception.
In that case, a temporary anonymous object will be created and destroyed right afterwards.
Download ngenuity ultimate versionThe exception is caught by value.
Download ngenuity ultimate versionAs a result, the whole memory block following the variable's address until a null terminator is found is treated as a string.
The analyzer detected a potential error that has to do with catching an exception by value.
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Catching exceptions by value causes two types of issues.
Therefore, the information about the exception won't be changed.
Download ngenuity ultimate versionSo, if we attempt to read the string length at a negative offset, we'll get a random value.
If you pass a simple Unicode string as an argument to a COM function that is expecting a BSTR, the COM function will fail.
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Download ngenuity ultimate versionThis issue will result in using additional memory outside the allocated block and may cause a crash or incorrect program behavior.
It appears immediately before the first character of the data string.
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But when the 'func' function finished, the destructor for 'a' will be called once again.
The analyzer detected the throw keyword followed by a pair of parentheses with various values inside separated by commas.
Download ngenuity ultimate versionActually, we will quote the article from MSDN.
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Download ngenuity ultimate versionIt may lead to runtime errors since functions working with pointers to buffers of characters expect a number of characters and, sometimes, a null terminator at the end of the buffer.
Download ngenuity ultimate versionThe analyzer detected an error that has to do with calling a destructor for the second time.
Download ngenuity ultimate versionIn the right part, executing two comma operators results in variable 'z'.
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BSTR is a pointer.
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Download ngenuity ultimate versionIt is very likely that the programmer forgot to specify the type of the exception to be thrown.
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Download ngenuity ultimate versionReallocates a previously allocated string to be the size of a second string and copies the second string into the reallocated memory.
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Use the BSTR data type in all interfaces that will be accessed from script.
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This value does not include the terminating null character.
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Now the Print() function will print all the necessary information.
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Download ngenuity ultimate versionIt's just that the developer wanted to combine the operations of retrieving a value and checking it in one expression.
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Download ngenuity ultimate versionThis is an interesting case when the 'auto' operator loses type information and makes things worse rather than help.
The analyzer detected an attempt to create an object using 'placement new' while the size of the allocated storage is not large enough to store this object.
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However, the code still compiles successfully, although it doesn't work as intended.
Download ngenuity ultimate versionYou can look at examples of errors detected by the V749 diagnostic.
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