Problem with declare and use of global constant

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Could somebody help me ?

I had declared a constant and I need that be global

#define SVCNAME TEXT("testit")
...
SERVICE_TABLE_ENTRY DispatchTable[] =
{
{ SVCNAME, (LPSERVICE_MAIN_FUNCTION) testit },
{ NULL, NULL }
};

and I got:

Error C2440 'inicializando': no se puede realizar la conversión de 'const wchar_t [7]' a 'LPWSTR' easyDB C:\Software\test1\test2\dllmain.cpp 60

.

What I have tried:

I tried some ways of declare a global constant, also that be LPWSTR at time of the declaration.

Posted 28-Jul-20 10:15am

Member 14900426

Updated 28-Jul-20 20:25pm

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Mircea Neacsu · Answer 1 · 2020-07-28T15:24:00

Try this:

C++

wchar_t testit_name[] = "testit";
SERVICE_TABLE_ENTRY DispatchTable[] =
{
{ testit_name, (LPSERVICE_MAIN_FUNCTION) testit },
{ NULL, NULL }
};

For some reason (probably this definition hasn't been updated in many years)
SERVICE_TABLE_ENTRY is defined as:

C++

typedef struct _SERVICE_TABLE_ENTRYW {
  LPWSTR                   lpServiceName;
  LPSERVICE_MAIN_FUNCTIONW lpServiceProc;
} SERVICE_TABLE_ENTRYW, *LPSERVICE_TABLE_ENTRYW;

It should have probably been

C++

LCPWSTR lpServiceName

Setting a string with the service name makes it non-const and the compiler should not complain any more.

KarstenK · Answer 2 · 2020-07-28T20:25:00

Solution 2

Write in the header:

C++

extern const wchar_t *testit_name;
//in the cpp files
const wchar_t *testit_name = TEXT("testit");

Posted 28-Jul-20 20:25pm

KarstenK