how to get the available space of chip?

[AlexLiu]

how to get the available space of chip?

[DaHuFa]

In JavaCardAPI, the JCSystem.getAvailableMemory() API may help you get your want.

[AlexLiu]

but why the space size obtained by API is smaller than the actual space size?

[scplatform]

do it like this:

Code: Select all

while (true) {
	try {
		bbb = JCSystem.makeTransientByteArray(memsize, JCSystem.MEMORY_TYPE_TRANSIENT_DESELECT);
		allmemsize += memsize;
		if(memsize != 0x7fff)
			break;
	} catch (CardRuntimeException ex) {
		memsize -= 1;
		continue;
	}
}

[DaHuFa]

In 《JavaCardAPI》, one item in Notes of getAvailableMemory() is "If the number of available bytes is greater than 32767, then this method returns 32767."
So, if the return value is 32767, you should call getAvailableMeory() again to look up whether the card has more available memory.