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In C++ code, add an impossible number at the end of the array, such as-1, and then read it in C#:

C++ code:

char *A(char buf[])

{

char buffer[50]= { }；

int I = 0；

while(buf[i]！ = '/0 ' & amp； & amp & lt49) {

buff[I]= buf[I]

i++；

}

buffer[I]=- 1；

Return buffer;

}

/////////////////////////////

C# code:

Unsafe {

char * buffer = A(buf)；

int I = 0；

while(buffer[i++]！ = - 1) {

console . out . writeln(buffer[I])；

}

}

Or you can write another function int getSize () in the DLL to return the length of the array:

C++ code:

Static int size = 0；;

int getSize(){

Returns the size;

}

char *A(char buf[])

{

char buffer[50]= { }；

while(buf[i]！ = '/0 ' & amp； & amp & lt49) {

buff[I]= buf[I]

size++；

}

Return buffer;

}

C# code:

C# code:

Unsafe {

char * buffer = A(buf)；

int size = getSize()；

for(int I = 0； I< size; i++) {

console . out . writeln(buffer[I])；

}

}