Mapviewoffile problem can't use it more than once?

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C

kernel

C++14

void sendrequests() {
auto Readstring = (char*)MapViewOfFile(hMapFileW, FILE_MAP_WRITE, 0, 0, 4096);

RtlCopyMemory(Readstring, "Read", 4);

printf("message has been sent to kernel [Read]! \n");


UnmapViewOfFile(Readstring) } ;

so basically if i do something like this

it works fine but if i add another mapviewoffile after that call it doesn't send anything to my driver , am mapping the section with zwmapviewofsection and looping until i find "Read" string then if it is found it will execute some code but problem is i can't send more than 1 request with mapviewoffile so i don't really know what is the problem with this issue. any help in advance is much appreciated.

What I have tried:

<pre lang="c++">void sendrequests() {
auto Readstring = (char*)MapViewOfFile(hMapFileW, FILE_MAP_WRITE, 0, 0, 4096);

RtlCopyMemory(Readstring, "Read", 4);

printf("message has been sent to kernel [Read]! \n");


UnmapViewOfFile(Readstring) 


auto Read_test = (char*)MapViewOfFile(hMapFileW, FILE_MAP_WRITE, 0, 0, 4096);

RtlCopyMemory(Read_test , "Test", 4);

printf("message has been sent to kernel [Read_test ]! \n");

UnmapViewOfFile(Read_test);

// but it doesn't work for some reason

} ;