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GetProcAddress info  Overview  Group

The GetProcAddress function returns the address of the specified exported dynamic-link library (DLL) function.

FARPROC GetProcAddress(

    HMODULE hModule,

// handle to DLL module

    LPCSTR lpProcName 

// name of function

   );

Parameters

hModule
Identifies the DLL module that contains the function. The LoadLibrary or GetModuleHandle function returns this handle.
lpProcName
Points to a null-terminated string containing the function name, or specifies the function’s ordinal value. If this parameter is an ordinal value, it must be in the low-order word; the high-order word must be zero.

Return Values

If the function succeeds, the return value is the address of the DLL’s exported function.

If the function fails, the return value is NULL. To get extended error information, call GetLastError.

Remarks

The GetProcAddress function is used to retrieve addresses of exported functions in DLLs.

The spelling and case of the function name pointed to by lpProcName must be identical to that in the EXPORTS statement of the source DLL’s module-definition (.DEF) file.

The lpProcName parameter can identify the DLL function by specifying an ordinal value associated with the function in the EXPORTS statement. GetProcAddress verifies that the specified ordinal is in the range 1 through the highest ordinal value exported in the .DEF file. The function then uses the ordinal as an index to read the function’s address from a function table. If the .DEF file does not number the functions consecutively from 1 to N (where N is the number of exported functions), an error can occur where GetProcAddress returns an invalid, non-NULL address, even though there is no function with the specified ordinal.

In cases where the function may not exist, the function should be specified by name rather than by ordinal value.

See Also

FreeLibrary, GetModuleHandle, LoadLibrary 


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