如何:將 Unmanaged 資源載入至位元組陣列
本主題討論將 Unmanaged 資源載入數位的 Byte 數種方式。
範例
如果您知道 Unmanaged 資源的大小,您可以預先配置 CLR 陣列,然後使用 CLR 陣列陣列的指標將資源載入數位。
// load_unmanaged_resources_into_Byte_array.cpp
// compile with: /clr
using namespace System;
void unmanaged_func( unsigned char * p ) {
for ( int i = 0; i < 10; i++ )
p[ i ] = i;
}
public ref class A {
public:
void func() {
array<Byte> ^b = gcnew array<Byte>(10);
pin_ptr<Byte> p = &b[ 0 ];
Byte * np = p;
unmanaged_func( np ); // pass pointer to the block of CLR array.
for ( int i = 0; i < 10; i++ )
Console::Write( b[ i ] );
Console::WriteLine();
}
};
int main() {
A^ g = gcnew A;
g->func();
}
0123456789
此範例示範如何將數據從 Unmanaged 記憶體區塊複製到受控數組。
// load_unmanaged_resources_into_Byte_array_2.cpp
// compile with: /clr
using namespace System;
using namespace System::Runtime::InteropServices;
#include <string.h>
int main() {
char buf[] = "Native String";
int len = strlen(buf);
array<Byte> ^byteArray = gcnew array<Byte>(len + 2);
// convert any native pointer to IntPtr by doing C-Style cast
Marshal::Copy( (IntPtr)buf, byteArray, 0, len );
}