Hi guys
I need a bit help here for syntax.
I´m building a dll for pdb parsings with msdia and currently writting a tutorial on how to use the exported functions. My dll contains only 2 functions "GetPDBInfo" and "FreePDB". Since it does not have a .lib or a .def file, how is the proper syntax to calling the functions of the dll in masm and plain C ?
I mean, despited the usage of LoadLibrary. I want to know the proper syntax such as:
#pragma dll("path/PDBRipper.dll")
Is the above correct in C ? If it is...then what ? How to properly call the external functions ?
And what are the correct syntax for masm on this same situations (loading the library and their functions) without having to build a lib or def file ?
Btw:
The function GetPDBInfo contains only 2 parameters
pUniString: A pointer to a Unicode Null Terminated string that is the path of the pdb
Flags: A integer value that is used as a flag to handle the equates for the function
On sucess it returns on eax a string allocated in memory with the proper tokens to be easily parsed. Btw: I kept it simple. Each element of the pdb is separated with a "|" token ;)
The function Free have 1 parameter:
hMem: A pointer to the generated Ascii string allocated in memory by GetPDBInfo
Simple Masm32 example:
mov hDll, rv(LoadLibrary, chr$("MbMicroDll")) ; rv is the retval macro, it returns eax
.if eax
mov ptrInstr, rv(GetProcAddress, hDll, chr$("InstrDLL"))
.if eax
push 2+4 ; mode 2 = ignore case of first letter, 4 = whole word
push chr$("test") ; the pattern
push chr$("This is a Test") ; the source
push 1 ; the start pos
call ptrInstr
MsgBox 0, eax, chr$("The match is here:"), MB_OK
.else
invoke MessageBox, 0, chr$("InstrDLL not found"), 0, MB_OK
.endif
invoke FreeLibrary, hDll
.else
invoke MessageBox, 0, chr$("DLL not found"), 0, MB_OK
.endif
Hi JJ. Many thanks. I´ll include that on the tutorial.
Btw, there is another way to load it when the dll don´t have a def or lib file ? I mean, assuming the "#pragma dll" token in C is correct, is there a similar token for masm?
In RosAsm for example, there is no need for such definitions or lbraries, since the dll can be called directly, ex:
....
call 'user32.MessageBoxA'
But, i don´t recall having something similar in masm, and i´m not sure how is he syntax in C (If the pragma token is the proper one)
#pragma dll... does not appear to be supported by the Microsoft compilers:
http://msdn.microsoft.com/en-us/library/d9x1s805.aspx
Visual Basic supports a "lib" clause, that if I recall correctly when added to a procedure declaration will allow you to call the procedure without an import library or an explicit LoadLibrary + GetProcAddress, but I can't recall anything similar for C/C++.
And there are the MASM32 LoadProcAddress, GetDllProc, and DDPROTO macros.
Hmm, ok. So there will be no much alternatives except building those defs and a small lib with vortex´s tools (http://www.vortex.masmcode.com). No problem, i´ll release a lib file with the dll. It may be worthfull for masm and C programmers as well. At least it will be better provide another alternatives assides LoadLibrary etc