all tasks

Task/Use-another-language-to-call-a-function/Go/use-another-language-to-call-a-function-1.go

@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include "_cgo_export.h"
+
+void Run()
+{
+   char     Buffer [1024];
+   size_t   Size = sizeof (Buffer);
+
+   if (0 == Query (Buffer, &Size))
+   ...

Task/Use-another-language-to-call-a-function/Go/use-another-language-to-call-a-function-2.go

@@ -0,0 +1,27 @@
+package main
+
+// #include <stdlib.h>
+// extern void Run();
+import "C"
+import "unsafe"
+
+func main() {
+    C.Run()
+}
+
+const msg = "Here am I"
+
+//export Query
+func Query(cbuf *C.char, csiz *C.size_t) C.int {
+    if int(*csiz) <= len(msg) {
+        return 0
+    }
+    pbuf := uintptr(unsafe.Pointer(cbuf))
+    for i := 0; i < len(msg); i++ {
+        *((*byte)(unsafe.Pointer(pbuf))) = msg[i]
+        pbuf++
+    }
+    *((*byte)(unsafe.Pointer(pbuf))) = 0
+    *csiz = C.size_t(len(msg) + 1)
+    return 1
+}