MIDL (Microsoft Interface Definition Language) is a text-based interface description language by Microsoft, based on the DCE/RPC IDL which it extends for use with the Microsoft Component Object Model. Its compiler is also called MIDL.
Questions tagged [midl]
186 questions
0
votes
1 answer
Custom media effect in Win10 Universal App
I'm developing an Universal Windows App that uses the camera and I need to create a custom effect for the camera. The app is written in C# and the effect is a C++ DLL that uses Media Foundation and an IDL to define a custom WinRT component.
I…
cedrou
- 2,780
- 1
- 18
- 23
0
votes
1 answer
Microsoft MIDL does not report an error if a typedef uses an unknown type, is it a bug?
I would like to know whether I am missing something:
//this is test.idl
typedef foo foo_t;
// end of test.idl
When I compile test.idl with the following command:
midl /W4 test.idl
I get this output
Microsoft (R) 32b/64b MIDL Compiler Version…
Alessandro Jacopson
- 18,047
- 15
- 98
- 153
0
votes
1 answer
Why do I get an extra GUID type definition when compiling and importing bits.idl?
I'm writing some .NET code against the COM BITS API. I found the bits.idl file under windows kits, and did midl bits.idl, which gave me bits.tlb. I then ran tlbimp bits.tlb and got BackgroundCopyManager.dll.
Everything is as expected in this…
Jay Carlton
- 1,118
- 1
- 11
- 27
0
votes
0 answers
Function pointer typedef only allowed once in MIDL?
Here is a simple test. The function pointer type FN_t appears twice in ITest::Test & ITest::Test2.
import "oaidl.idl";
import "ocidl.idl";
typedef void(* FN_t)();
[
uuid(f5d5eb17-45c7-4cce-a176-9ed2e1083d2a),
object,
local,
…
YOUKU
- 13
- 4
0
votes
1 answer
[MIDL]How to use interfaces declared in c/c++ headers in idl files?
ID2D1RenderTarget is an interface defined in d2d1.h. I want to use it in my IDL interface like this:
interface IXXX : IUnknown {
HRESULT XXX([out, retval] ID2D1RenderTarget **_ppRT);
}
d2d1.idl is not included in the SDK and I can only get…
YOUKU
- 13
- 4
0
votes
1 answer
"version" attribute in Microsoft IDL
My question is: what is the correct usage of the version tag in an IDL file that defines COM interfaces and classes and enums?
The MSN documentation of it is confusing: the first paragraph under "Remarks" seems to clearly say that the IID must be…
M.M
- 138,810
- 21
- 208
- 365
0
votes
1 answer
E_INVALIDARG exception passing a SAFEARRAY of UDT from Managed to COM
a similar problem is posted many times here but I cannot figure out why I get this COM Exception.
I have an IDL file like:
typedef [uuid(A6F30630-53F5-4688-829A-C084BA1C7DC0)]
enum EMaskActions
{
....
}EMaskActions;
typedef…
Barzo
- 1,039
- 1
- 11
- 37
0
votes
1 answer
Windows C - Pass pointer by reference to dynamic allocated memory of unsigned char with MIDL Protocol
I'm using MIDL protocol(RPC) and i trying to pass pointer by reference to an allocated memory of unsigned char. but only the first attribute of the array filled with the correct value.
MIDL CODE:
// File FPGA_RPC_MIDL.idl
[
// A unique…
oshribm
- 145
- 1
- 7
0
votes
2 answers
What causes name collision in an IDL file?
We have an idl file with multiple interfaces defined, two of which have someting like this:
[
object,
uuid(79E24BAA-DC12-4caf-91DD-2A4D47FED30A),
helpstring("ISomeInterface Interface"),
pointer_default(unique)
]
interface…
John C
- 611
- 1
- 9
- 26
0
votes
1 answer
How to fix Typelib generated by MIDL?
I am trying to generate typelib of INetCfg interface using IDL in this page, seen below:
import "netcfgx.idl";
[
uuid(d99085ff-c5d7-4a4c-a987-91a513e268a9),
version(1.0),
helpstring("NetCfgX 1.0 Type Library")
]
library…
swdev
- 4,997
- 8
- 64
- 106
0
votes
1 answer
Convert IDL structure with conformant array to header
I need to pass via Microsoft RPC structure with conformant array. This is how I write it in IDL:
struct BarStruct
{
byte a;
int b;
byte c;
long lArraySize;
[size_is(lArraySize)] char achArray[*];
};
Generated header:
struct BarStruct
{
…
vico
- 17,051
- 45
- 159
- 315
0
votes
1 answer
Pass structure via Microsoft RPC
I got error while I was tying to pass structure from RPC client to server. Client calls Output3 procedure.
Definition in IDL:
struct BarStruct
{
byte a;
int b;
byte c;
char* d;
char* ddd;
};
void Output3([in] handle_t hBinding, [in, out]…
vico
- 17,051
- 45
- 159
- 315
0
votes
1 answer
Purpose of CINTERFACE flag in midl generated files?
Using Microsoft's IDL compiler, if I do this:
midl a.idl /iid iid.cpp
I can't compile iid.cpp on MinGW because of the following warning:
c:\mingw\bin\../lib/gcc/mingw32/4.6.2/../../../../include/rpcproxy.h:14:2: warning: #warning "rpcproxy type…
0xbe5077ed
- 4,565
- 6
- 35
- 77
0
votes
1 answer
Weird namespace addition when importing a typelib
I want to add a method accepting IStream* to my COM interface. Here's the idl excerpt:
import "oaidl.idl";
import "ocidl.idl";
import "objidl.idl";//IStream is declared in this .idl file
[
uuid(uuidhere),
version(1.0)
]
library MyLibrary
{
…
sharptooth
- 167,383
- 100
- 513
- 979
0
votes
0 answers
COM OLE_HANDLE type mismatch in generated C# interop DLL
I have inherited a Microsoft Visual C++ COM project which is a dependency of a core C# application I work with. When recompiling the project and regenerating the interop DLL (using tlbimp), several methods in my library that take in an OLE_HANDLE…
Henry Thacker
- 63
- 1
- 5