Hello,
I am fairly new to all this and I am hoping somone can help. I am writing a C# application that requires use of the Clipborad for inter-process communication. C# has methods I can leverage in order to accomplish this:
Clipboard.SetText(string);
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Unfortunately, there is an unacceptable delay when using this call. The receiving process does not recognize its presence for over 5 seconds. As such, moved onto native Win32 SDK calls. Namely: SetClipboardData() and its required support functions. This call gives me the speed I require as the contents are transferred near immediately to the clipboard when I use the native methods. Unfortunately, the call to free allocalted heap memory failes like clockwork on the fourth iteration.
When I comment out the FreeHGlobal function (bad juju...), everything operates as expected. Here is the class I use to use native methods:
class ClipboardHelper
{
[DllImport("user32.dll")]
static extern bool OpenClipboard(IntPtr hWndNewOwner);
[DllImport("user32.dll")]
static extern bool EmptyClipboard();
[DllImport("user32.dll")]
static extern IntPtr SetClipboardData(uint uFormat, IntPtr hMem);
[DllImport("user32.dll")]
static extern bool CloseClipboard();
[DllImport("kernel32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern IntPtr GlobalFree(IntPtr handle);
// Metafile mf is set to a state that is not valid inside this function.
static public bool PutTextOnClipboard(IntPtr hWnd, StringBuilder s)
{
bool bResult = false;
if (OpenClipboard(hWnd))
{
IntPtr ptr = Marshal.StringToHGlobalAnsi(s.ToString());
if (EmptyClipboard())
{
IntPtr hRes = SetClipboardData(1, ptr);
CloseClipboard();
}
Marshal.FreeHGlobal(ptr);
//GlobalFree(ptr);
}
return true;
}
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The top level exception is:
An unhandled exception of type 'System.StackOverflowException' occurred in mscorlib.dll
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Does anyone have any idea what I am doing wrong here?
Partial stack trace:
mscorlib.dll!System.AccessViolationException.AccessViolationException() + 0x14 bytes
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Reflection.CustomAttributeEncodedArgument.ParseAttributeArguments(System.Reflection.ConstArray attributeBlob, ref System.Reflection.CustomAttributeCtorParameter[] customAttributeCtorParameters, ref System.Reflection.CustomAttributeNamedParameter[] customAttributeNamedParameters, System.Reflection.RuntimeModule customAttributeModule) + 0x5b bytes
mscorlib.dll!System.Reflection.CustomAttributeData.CustomAttributeData(System.Reflection.RuntimeModule scope, System.Reflection.CustomAttributeRecord caRecord) + 0x4c4 bytes
mscorlib.dll!System.Reflection.CustomAttributeData.GetCustomAttributes(System.Reflection.RuntimeModule module = {System.Reflection.RuntimeModule}, int tkTarget) + 0x53 bytes
mscorlib.dll!System.Reflection.CustomAttributeData.GetCustomAttributesInternal(System.Reflection.RuntimeAssembly target = {System.Reflection.RuntimeAssembly}) + 0x47 bytes
mscorlib.dll!System.Reflection.RuntimeAssembly.GetCustomAttributesData() + 0x5 bytes
mscorlib.dll!System.Reflection.CustomAttributeData.GetCustomAttributes(System.Reflection.Assembly target) + 0x21 bytes
mscorlib.dll!System.Resources.ManifestBasedResourceGroveler.GetNeutralResourcesLanguage(System.Reflection.Assembly a = {System.Reflection.RuntimeAssembly}, ref System.Resources.UltimateResourceFallbackLocation fallbackLocation = MainAssembly) + 0x31 bytes
mscorlib.dll!System.Resources.ResourceManager.CommonSatelliteAssemblyInit() + 0x6d bytes
mscorlib.dll!System.Resources.ResourceManager.ResourceManager(string baseName, System.Reflection.Assembly assembly = {System.Reflection.RuntimeAssembly}) + 0x51 bytes
mscorlib.dll!System.Environment.ResourceHelper.GetResourceStringCode(object userDataIn) + 0x111 bytes
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Environment.ResourceHelper.GetResourceString(string key, System.Globalization.CultureInfo culture) + 0xd1 bytes
mscorlib.dll!System.Environment.GetResourceStringLocal(string key) + 0x48 bytes
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Runtime.InteropServices.COMException.COMException() + 0x14 bytes
[Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.Runtime.InteropServices.Marshal.FreeHGlobal(System.IntPtr hglobal) + 0x74 bytes
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