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nsCategoryManagerUtils.h
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00037 
00038 #ifndef nsCategoryManagerUtils_h__
00039 #define nsCategoryManagerUtils_h__
00040 
00041 #include "nsICategoryManager.h"
00042 #include "nsCOMPtr.h"
00043 
00044 NS_COM nsresult
00045 NS_CreateServicesFromCategory(const char *category,
00046                               nsISupports *origin,
00047                               const char *observerTopic);
00048 
00049 class NS_COM nsCreateInstanceFromCategory : public nsCOMPtr_helper
00050 {
00051 public:
00052     nsCreateInstanceFromCategory(const char *aCategory, const char *aEntry,
00053                                  nsISupports *aOuter, nsresult *aErrorPtr)
00054         : mCategory(aCategory),
00055           mEntry(aEntry),
00056           mOuter(aOuter),
00057           mErrorPtr(aErrorPtr)
00058     {
00059         // nothing else to do;
00060     }
00061     virtual nsresult NS_FASTCALL operator()( const nsIID& aIID, void** aInstancePtr) const;
00062 
00063 private:
00064     const char *mCategory;  // Do not free.  This char * is not owned.
00065     const char *mEntry;     // Do not free.  This char * is not owned.
00066 
00067     nsISupports *mOuter;
00068     nsresult *mErrorPtr;
00069 
00070 };
00071 
00072 inline
00073 const nsCreateInstanceFromCategory
00074 do_CreateInstanceFromCategory( const char *aCategory, const char *aEntry,
00075                                nsresult *aErrorPtr = 0)
00076 {
00077     return nsCreateInstanceFromCategory(aCategory, aEntry, 0, aErrorPtr);
00078 }
00079 
00080 inline
00081 const nsCreateInstanceFromCategory
00082 do_CreateInstanceFromCategory( const char *aCategory, const char *aEntry,
00083                                nsISupports *aOuter, nsresult *aErrorPtr = 0)
00084 {
00085     return nsCreateInstanceFromCategory(aCategory, aEntry, aOuter, aErrorPtr);
00086 }
00087 
00088 
00089 #endif