Accessing struct memory allocated in C code from C# code
I have a list of struct allocated from C code. I am returning the pointer of this struct list to C# code. And finally C# code is using this pointer and marshaling it into a corresponding C# struct list. Both C and C# code are bundled together.
I wanted to confirm is there any possibility of memory corruption in this scenario or can there be case in which we lose handle to the memory pointer is pointing. When will the memory allocated from C code be destroyed.
Below is a snippet of the code.
Sample C Code
typedef struct sampleData {
int id;
int sid;
} SampleData;
SampleData* func(){
SampleData* pd = (SampleData*) malloc(10 * sizeof(SampleData)) ;
for(int i=0;i<10;i++){
pd[i].id=i*10;
pd[i].sid=i*10;
}
return pd;
}
sample C# code
class Test
{
[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct TestData{
[MarshalAs(UnmanagedType.I4)]
public int id;
[MarshalAs(UnmanagedType.I4)]
public int sid;
}
[DllImport("sample.so", EntryPoint = "func")]
static extern IntPtr func();
public void collectSampleData()
{
IntPtr idPtr = IntPtr.Zero;
IntPtr sidPtr = IntPtr.Zero;
idPtr = func();
for(int i=0;i<10;i++){
TestData TestDataObj=new TestData();
IntPtr currPtr = new IntPtr(idPtr.ToInt64() + ( i * Marshal.SizeOf(typeof(TestData))));
TestDataObj = (TestData)Marshal.PtrToStructure(currPtr,typeof(TestData));
Console.WriteLine(TestDataObj.id+" "TestDataObj.sid);
}
}
}
In the above code is there a possibility to loose the handle of memory allocation done for Sampledata struct list when accessing from C# side. As the above code for now is giving correct values.
c memory-leaks c#
asked 1 hour ago
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I have a list of struct allocated from C code. I am returning the pointer of this struct list to C# code. And finally C# code is using this pointer and marshaling it into a corresponding C# struct list. Both C and C# code are bundled together.
I wanted to confirm is there any possibility of memory corruption in this scenario or can there be case in which we lose handle to the memory pointer is pointing. When will the memory allocated from C code be destroyed.
Below is a snippet of the code.
Sample C Code
typedef struct sampleData {
int id;
int sid;
} SampleData;
SampleData* func(){
SampleData* pd = (SampleData*) malloc(10 * sizeof(SampleData)) ;
for(int i=0;i<10;i++){
pd[i].id=i*10;
pd[i].sid=i*10;
}
return pd;
}
sample C# code
class Test
{
[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct TestData{
[MarshalAs(UnmanagedType.I4)]
public int id;
[MarshalAs(UnmanagedType.I4)]
public int sid;
}
[DllImport("sample.so", EntryPoint = "func")]
static extern IntPtr func();
public void collectSampleData()
{
IntPtr idPtr = IntPtr.Zero;
IntPtr sidPtr = IntPtr.Zero;
idPtr = func();
for(int i=0;i<10;i++){
TestData TestDataObj=new TestData();
IntPtr currPtr = new IntPtr(idPtr.ToInt64() + ( i * Marshal.SizeOf(typeof(TestData))));
TestDataObj = (TestData)Marshal.PtrToStructure(currPtr,typeof(TestData));
Console.WriteLine(TestDataObj.id+" "TestDataObj.sid);
}
}
}
In the above code is there a possibility to loose the handle of memory allocation done for Sampledata struct list when accessing from C# side. As the above code for now is giving correct values.
c memory-leaks c#
asked 1 hour ago
PREETI BANSAL
1
New contributor
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a list of struct allocated from C code. I am returning the pointer of this struct list to C# code. And finally C# code is using this pointer and marshaling it into a corresponding C# struct list. Both C and C# code are bundled together.
I wanted to confirm is there any possibility of memory corruption in this scenario or can there be case in which we lose handle to the memory pointer is pointing. When will the memory allocated from C code be destroyed.
Below is a snippet of the code.
Sample C Code
typedef struct sampleData {
int id;
int sid;
} SampleData;
SampleData* func(){
SampleData* pd = (SampleData*) malloc(10 * sizeof(SampleData)) ;
for(int i=0;i<10;i++){
pd[i].id=i*10;
pd[i].sid=i*10;
}
return pd;
}
sample C# code
class Test
{
[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct TestData{
[MarshalAs(UnmanagedType.I4)]
public int id;
[MarshalAs(UnmanagedType.I4)]
public int sid;
}
[DllImport("sample.so", EntryPoint = "func")]
static extern IntPtr func();
public void collectSampleData()
{
IntPtr idPtr = IntPtr.Zero;
IntPtr sidPtr = IntPtr.Zero;
idPtr = func();
for(int i=0;i<10;i++){
TestData TestDataObj=new TestData();
IntPtr currPtr = new IntPtr(idPtr.ToInt64() + ( i * Marshal.SizeOf(typeof(TestData))));
TestDataObj = (TestData)Marshal.PtrToStructure(currPtr,typeof(TestData));
Console.WriteLine(TestDataObj.id+" "TestDataObj.sid);
}
}
}
In the above code is there a possibility to loose the handle of memory allocation done for Sampledata struct list when accessing from C# side. As the above code for now is giving correct values.
c memory-leaks c#
asked 1 hour ago
PREETI BANSAL
1
New contributor
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a list of struct allocated from C code. I am returning the pointer of this struct list to C# code. And finally C# code is using this pointer and marshaling it into a corresponding C# struct list. Both C and C# code are bundled together.
I wanted to confirm is there any possibility of memory corruption in this scenario or can there be case in which we lose handle to the memory pointer is pointing. When will the memory allocated from C code be destroyed.
Below is a snippet of the code.
Sample C Code
typedef struct sampleData {
int id;
int sid;
} SampleData;
SampleData* func(){
SampleData* pd = (SampleData*) malloc(10 * sizeof(SampleData)) ;
for(int i=0;i<10;i++){
pd[i].id=i*10;
pd[i].sid=i*10;
}
return pd;
}
sample C# code
class Test
{
[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct TestData{
[MarshalAs(UnmanagedType.I4)]
public int id;
[MarshalAs(UnmanagedType.I4)]
public int sid;
}
[DllImport("sample.so", EntryPoint = "func")]
static extern IntPtr func();
public void collectSampleData()
{
IntPtr idPtr = IntPtr.Zero;
IntPtr sidPtr = IntPtr.Zero;
idPtr = func();
for(int i=0;i<10;i++){
TestData TestDataObj=new TestData();
IntPtr currPtr = new IntPtr(idPtr.ToInt64() + ( i * Marshal.SizeOf(typeof(TestData))));
TestDataObj = (TestData)Marshal.PtrToStructure(currPtr,typeof(TestData));
Console.WriteLine(TestDataObj.id+" "TestDataObj.sid);
}
}
}
In the above code is there a possibility to loose the handle of memory allocation done for Sampledata struct list when accessing from C# side. As the above code for now is giving correct values.
c memory-leaks c#
c memory-leaks c#
asked 1 hour ago
PREETI BANSAL
1
New contributor
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
PREETI BANSAL
1
New contributor
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
PREETI BANSAL
1
New contributor
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
PREETI BANSAL
1
asked 1 hour ago
PREETI BANSAL
1
1
New contributor
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
PREETI BANSAL is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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