- INDIRECTION REQUIRES POINTER OPERAND CODE
- INDIRECTION REQUIRES POINTER OPERAND DOWNLOAD
- INDIRECTION REQUIRES POINTER OPERAND WINDOWS
I may also give inefficient code or introduce some problems to discourage copy/paste coding. They are meant to just illustrate a point. Any samples given are not meant to have error checking or show best practices. You never would have noticed as being a problem. While you would have to cast the returns from malloc, for the rest of it the C++ type safety will point out things that C allows but So instead of defining your structure to take a bunch of ints, actually use pointers.įinally, if you are having these kinds of problems, I would suggest that you use C++ to compile your code. The 圆4 (AMD64, EMT64) is one such platform where int is 4 bytes, but pointers are 8 bytes. The int type isn't always guaranteed to be the same size as a pointer, so this could lead to corruption of the pointer. There is also the fact that you are using int in the priorityqueue_t structure to store pointers. To be larger than the character type, and so you are corrupting that value, the pointer is also going to be truncated too. First, I noticed that you are assigning an array of char to the char field value in pqentry_t, this is assigning a pointer type to a character type. So your problem is that you are not allocating enough memory for your priorityqueue_t structure.Īnyway, there are another couple of issues that I would like to point out.
INDIRECTION REQUIRES POINTER OPERAND WINDOWS
Now I don't know in what circumstances you have tried this and it succeeded, but Windows is quite picky with the sizes of objects allocated by malloc, if you allocate 4 bytes,Īnd then write past the end then Windows will tell you as soon as it detects this. So you are basically allocating 4 bytes for a structure that is 24 bytes in size. Printf("size of priorityqueue_t %d\n", sizeof(struct priorityqueue_t)) Printf("size of priorityqueue_t::size %d\n", sizeof(pq->size)) If you detect the sizes for these: int main() This should be quite obvious since priorityqueue_t::size is an unsigned long where priorityqueue_t is a structure that contains this unsigned long amongst other things.
There is one line in particular that stands out: struct priorityqueue_t *pq = malloc(sizeof(pq->size)) Umm, well, I would be surprised if you managed to use this without errors being caused. in other programs and never got this error also in the function create() it works.Ĭan sombody point me in a right direction here?ĮDIT: For some reason I now get a C++ runtime libary exception window. I used this method of creating a pointer now several times, i.e. Unhandled exception at 0x77A5A849 (ntdll.dll) in OOA Praktikum 1.exe: 0xC0000374: A heap has been corrupted (parameters: 0x77A95910). Now I always get the following exception at line 52: Printf_s("Quit = 0 | insert = 1 | destroy = 2\n") //TODO: CHECK FOR CORRECT NUMBERS Struct priorityqueue_t *pq = pqueue_create() Struct pqentry_t *pe = malloc(sizeof(pqentry_t)) Ĭheck_func("ALLOCATE MEMORY FOR ENTRY:\nFAIL\n") Ĭheck_func("ALLOCATE MEMORY FOR ENTRY:\nPASS\n") Ĭhar uservalue = "TEST" //TODO: MAX_VALUE & TEST Void pqueue_insert(priorityqueue_t *pq, char* value, float p) Struct priorityqueue_t *pq = malloc(sizeof (pq->size)) Ĭheck_func("ALLOCATE MEMORY FOR QUEUE:\nFAIL\n") Ĭheck_func("ALLOCATE MEMORY FOR QUEUE:\nPASS\n") Priority must be greater or equal than NULL Also reinstalling and repairing VS did not help.Īs for the second issue I'm experiencing:
INDIRECTION REQUIRES POINTER OPERAND DOWNLOAD
Also other symbols are not loaded despite trying to download them via options->debug. for the purposes of security testing, run GCC with the -w option.1) For unknown reasons VS says source not available when an exception is triggered. To ignore warnings during compilation, e.g. Just for fun: To generate the equivalent x86 assembly language for the program (GAS syntax), type gcc -S test.c in the terminal, which will generate test.s.
The -o specifies the name of the output file. In the terminal, run gcc -o runtest test.c to compile it.Printf( // &k invalid - error: use of undeclared 'k' Printf( // *i invalid - error: indirection requires pointer operand ('int' invalid) lval (left-hand side value - write) = rval (right-hand side value - read) This post only documents a simple program to show the effects of * and & in C and does not attempt to explain what pointers are.įor a quick read, check out The 5-Minute Guide to C Pointers.