Misha Koshelev wrote:
+/* Macros for variant conversions */
+#define V_DECLARE \
+ VARIANTARG vararg[pDispParams->cArgs]; \
+ int iVarCount; \
+ HRESULT hr = S_OK; \
+ memset(vararg, 0, sizeof(vararg));
+#define V_PREPARE(n, type) \
+ VariantInit(&vararg[n]); \
+ hr = VariantChangeTypeEx(&vararg[n], &pDispParams->rgvarg[n], lcid, 0,
VT_##type); \
+ if (FAILED(hr)) \
+ { \
+ *puArgErr = n; \
+ goto v_finish; \
+ }
+#define V_PREPAREOPT(n, type) \
+ VariantInit(&vararg[n]); \
+ if (FAILED(VariantChangeTypeEx(&vararg[n], &pDispParams->rgvarg[n], lcid,
0, VT_##type))) \
+ VariantClear(&vararg[n]);
+#define V_PREPARED(n) (V_VT(&vararg[n]) != VT_EMPTY)
+#define V(n, type) V_##type(&vararg[n])
+#define V_RETURN(value, type) \
+ V_VT(pVarResult) = VT_##type; \
+ V_##type(pVarResult) = value;
+#define V_FAIL hr = E_FAIL;
+#define V_DEFAULT \
+ default: \
+ hr = DISP_E_MEMBERNOTFOUND;
+#define V_FINISH \
+ goto v_finish; /* suppress warnings about unused label v_free */ \
+v_finish: \
+ for (iVarCount = 0; iVarCount < pDispParams->cArgs; iVarCount++) \
+ if (V_PREPARED(iVarCount)) \
+ VariantClear(&vararg[iVarCount]); \
+ return hr;
This is quite ugly. You can at replace at least some of this with calls
to DispGetParam.
A lot of the methods only have one parameter so will end up simpler
without using these macros.
--
Rob Shearman
