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MIDL supports the following base and predefined types.
| Data type | Description | Default sign |
|---|---|---|
| boolean | 8 bits. Not compatible with oleautomation interfaces; use VARIANT_BOOL instead. | Unsigned |
| byte | 8 bits. | (not applicable) |
| char | 8 bits. | Unsigned |
| double | 64-bit floating point number. | (not applicable) |
| error_status_t | 32-bit unsigned integer for returning status values for error handling. | Unsigned |
| float | 32-bit floating point number. | (not applicable) |
| handle_t | Primitive handle type for binding. | (not applicable) |
| hyper | 64-bit integer. | Signed |
| int | 32-bit integer. On 16-bit platforms, cannot appear in remote functions without a size qualifier such as short, small, long or hyper. | Signed |
| __int8 | 8-bit integer. Equivalent to small. | Signed |
| __int16 | 16-bit integer. Equivalent to short. | Signed |
| __int32 | 32-bit integer. Equivalent to long. | Signed |
| __int3264 | An integer that is 32-bit on 32-bit platforms, and is 64-bit on 64-bit platforms. | Signed |
| __int64 | 64-bit integer. Equivalent to hyper. | Signed |
| long | 32-bit integer. | Signed |
| short | 16-bt integer. | Signed |
| small | 8-bit integer. | Signed |
| void | Indicates that the procedure does not return a value. | (not applicable) |
| void * | 32-bit pointer for context handles only. | (not applicable) |
| wchar_t | 16-bit predefined type for wide characters. | Unsigned |