Question

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Stack overflow visual C++, potentially array size?

This code is simply meant to read values from a binary file into the array DataBuffer. When the size of DataBuffer is greater than or equal to 515000, it simply crashes. I am developing this in Visual C++ 2010 on Windows 7. The function cbFileRead() is something whose source code I can not access. cbFileRead() expects DataBuffer to be of the type USHORT*.

#include <stdio.h>  // printf()
#include "cbw.h"    // cbFileRead()

int main(int argc, char* argv[]) {

    // Declarations
    char* FileName = argv[1];
    long FirstPoint = 0;
    long NumPoints;

    // Set data collection sizes
    const long chunkSize = 515000;
    NumPoints = chunkSize; // Number of points to be read into mem
    WORD DataBuffer[chunkSize-1];

    // Get data
    cbFileRead(FileName, FirstPoint, &NumPoints, DataBuffer);

    printf("Completed on data point %d whose value is %d\n", NumPoints, DataBuffer[chunkSize-1]);

    return 0;
}

What reasons are there for this crashing? I would expect the array size to be able to go much higher.

Answer 1

The default stack reservation size used by the linker is 1 MB. To
specify a different default stack reservation size for all threads and
fibers, use the STACKSIZE statement in the module definition (.def)
file.

Microsoft Dev Center – Thread Stack Size

Or you can allocate the memory dynamically with the new keyword.