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POWhat is the correct type cast to avoid a compiler warning using SERVICE_TABLE_ENTRY from winsvc.h
 

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  1. POWhat is the correct type cast to avoid a compiler warning using SERVICE_TABLE_ENTRY from winsvc.h
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    <p>When trying to set the SERVICE_TABLE_ENTRY using the example at <a href="https://stackoverflow.com/questions/41699/creating-windows-service-without-visual-studio">Creating Windows service without Visual Studio</a> and compiling using the mingw32 cross-compiler on Fedora 14 I get a compiler warning.</p> <p>The shortest I can make the sample is</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;windows.h&gt; #include &lt;winsvc.h&gt; #define MY_SVC_NAME "My Service" int cont_running = 1; DWORD WINAPI ServiceHandlerProc(DWORD ControlCode, DWORD a, void *b, void *c) { switch (ControlCode) { case SERVICE_CONTROL_STOP : ; cont_running = 0; } return 0; } void WINAPI ServiceMain(int argc, char *argv[], char *envp[]) { int hServiceStatus; hServiceStatus = RegisterServiceCtrlHandlerEx(MY_SVC_NAME, ServiceHandlerProc, 0); } int main(int argc, char *argv[], char *envp[]) { SERVICE_TABLE_ENTRY ServiceStartTable[] = { { MY_SVC_NAME, ServiceMain }, { 0, 0 } }; } </code></pre> <p>but the compiler is complaining about MY_SVC_NAME being the wrong type.</p> <pre><code>$ /usr/bin/i686-pc-mingw32-gcc -o /tmp/test ~/c/sample.c sample.c: In function 'main': sample.c:31:9: warning: initialization from incompatible pointer type </code></pre> <p>I've tried assigning a variable and using type LPSTR LPWSTR char * and char [] and also tried casting the type within the curly braces, but its not working.</p> <p>Looking at /usr/i686-pc-mingw32/sys-root/mingw/include/winsvc.h I see its defined as</p> <pre><code>typedef struct _SERVICE_TABLE_ENTRYA { LPSTR lpServiceName; LPSERVICE_MAIN_FUNCTIONA lpServiceProc; } SERVICE_TABLE_ENTRYA,*LPSERVICE_TABLE_ENTRYA; typedef struct _SERVICE_TABLE_ENTRYW { LPWSTR lpServiceName; LPSERVICE_MAIN_FUNCTIONW lpServiceProc; } SERVICE_TABLE_ENTRYW,*LPSERVICE_TABLE_ENTRYW; ... typedef SERVICE_TABLE_ENTRYW SERVICE_TABLE_ENTRY,*LPSERVICE_TABLE_ENTRY; ... typedef SERVICE_TABLE_ENTRYA SERVICE_TABLE_ENTRY,*LPSERVICE_TABLE_ENTRY; </code></pre> <p>So surely using</p> <pre><code>LPSTR my_svc=MY_SVC_NAME; SERVICE_TABLE_ENTRY ServiceStartTable[] = { { my_svc, ServiceMain }, { 0, 0 } }; </code></pre> <p>Should work ???</p> <p>Sorry, another search revealed this example code at <a href="https://stackoverflow.com/questions/7734763/windows-service-c">Windows Service C</a></p> <p>I changed my code to</p> <pre><code> SERVICE_TABLE_ENTRY ServiceStartTable[2]; ServiceStartTable[0].lpServiceName = MY_SVC_NAME; ServiceStartTable[0].lpServiceProc = (LPSERVICE_MAIN_FUNCTION)ServiceMain; ServiceStartTable[1].lpServiceName = NULL; ServiceStartTable[1].lpServiceProc = NULL; </code></pre> <p>and now it compiles without warnings.</p>
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    1. USbanjo67xxx
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    1. COHow is `LPSERVICE_MAIN_FUNCTION` defined? I have a strong hunch it needs to return `int`, not `void`. Try changing your `ServiceMain` function to return `int` and dropping the cast.
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      1. POWhat is the correct type cast to avoid a compiler warning using SERVICE_TABLE_ENTRY from winsvc.h
      1. USKeith Thompson
    2. CO@KeithThompson Thanks, but the typedef does specify void. ` typedef void (WINAPI *LPSERVICE_MAIN_FUNCTIONA)(DWORD,LPSTR*); typedef void (WINAPI *LPSERVICE_MAIN_FUNCTIONW)(DWORD,LPWSTR*); typedef LPSERVICE_MAIN_FUNCTIONA LPSERVICE_MAIN_FUNCTION; typedef LPSERVICE_MAIN_FUNCTIONW LPSERVICE_MAIN_FUNCTION; `
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      1. POWhat is the correct type cast to avoid a compiler warning using SERVICE_TABLE_ENTRY from winsvc.h
      1. USbanjo67xxx
    3. COYou missed a closing backtick in that comment; you still have time to edit it.
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      1. POWhat is the correct type cast to avoid a compiler warning using SERVICE_TABLE_ENTRY from winsvc.h
      1. USKeith Thompson
 

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