add Metadata and MetadataItem for Dataset

apps.go

@@ -58,31 +58,6 @@ func GDALTranslate(
 
 }
 
-// func GDALWarpCreateOutput(
-// 	nSrcCount int,
-// 	srcDS []Dataset,
-// 	pszFilename string,
-// 	pszFormat string,
-// 	papszTO []string,
-// 	ppapszCreateOptions *[]string,
-// 	eDT DataType,
-// 	phTransformArg unsafe.Pointer,
-// 	bSetColorInterpretation bool,
-// 	psOptions GDALWarpAppOptions,
-
-// ) GDALWarpAppOptions {
-
-// 	pahSrcDs := make([]C.GDALDatasetH, len(srcDs)+1)
-// 	for i := 0; i < len(srcDs); i++ {
-// 		pahSrcDs[i] = srcDs[i].cval
-// 	}
-// 	pahSrcDs[len(srcDs)] = (C.GDALDatasetH)(unsafe.Pointer(nil))
-
-// 	hDstDS := C.GDALWarpCreateOutput(
-// 		C.int(nSrcCount),
-// 	)
-// }
-
 func GDALWarp(
 	destName string,
 	dstDs Dataset,
@@ -105,7 +80,6 @@ func GDALWarp(
 	pahSrcDs := make([]C.GDALDatasetH, len(srcDs)+1)
 	for i := 0; i < len(srcDs); i++ {
 		pahSrcDs[i] = srcDs[i].cval
-		// defer C.free(unsafe.Pointer(pahSrcDs[i]))
 	}
 	pahSrcDs[len(srcDs)] = (C.GDALDatasetH)(unsafe.Pointer(nil))
 

gdal.go

@@ -583,6 +583,27 @@ func (object MajorObject) Metadata(domain string) []string {
 	panic("not implemented!")
 	return nil
 }
+func (dataset *Dataset) Metadata(domain string) []string {
+	cDomain := C.CString(domain)
+	defer C.free(unsafe.Pointer(cDomain))
+
+	p := C.GDALGetMetadata(
+		C.GDALMajorObjectH(unsafe.Pointer(dataset.cval)),
+		cDomain,
+	)
+	var strings []string
+	q := uintptr(unsafe.Pointer(p))
+	for {
+		p = (**C.char)(unsafe.Pointer(q))
+		if *p == nil {
+			break
+		}
+		strings = append(strings, C.GoString(*p))
+		q += unsafe.Sizeof(q)
+	}
+
+	return strings
+}
 
 // Set metadata
 func (object MajorObject) SetMetadata(metadata []string, domain string) {
@@ -653,6 +674,20 @@ func (object *Driver) MetadataItem(name, domain string) string {
 		),
 	)
 }
+func (object *Dataset) MetadataItem(name, domain string) string {
+	c_name := C.CString(name)
+	defer C.free(unsafe.Pointer(c_name))
+
+	c_domain := C.CString(domain)
+	defer C.free(unsafe.Pointer(c_domain))
+
+	return C.GoString(
+		C.GDALGetMetadataItem(
+			C.GDALMajorObjectH(unsafe.Pointer(object.cval)),
+			c_name, c_domain,
+		),
+	)
+}
 
 /* ==================================================================== */
 /*      GDALDataset class ... normally this represents one file.        */