winamp/Src/Winamp/TempFileCOM.cpp

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2024-09-24 12:54:57 +00:00
#include "TempFileCOM.h"
#include <shlwapi.h>
enum
{
DISP_TEMPFILE_WRITE_STRING,
DISP_TEMPFILE_CLOSE,
DISP_TEMPFILE_GET_FILENAME,
DISP_TEMPFILE_DELETE,
};
TempFileCOM::TempFileCOM(const wchar_t *ext)
{
ref=1;
wchar_t tempPath[MAX_PATH-14] = {0};
GetTempPathW(MAX_PATH-14, tempPath);
GetTempFileNameW(tempPath, L"tfc", 0, filename);
if (ext)
{
PathRemoveExtensionW(filename);
PathAddExtensionW(filename, ext);
}
hFile = CreateFileW(filename, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_TEMPORARY, 0);
wchar_t BOM = 0xFEFF;
DWORD written = 0;
WriteFile(hFile, &BOM, 2, &written, NULL);
}
#define CHECK_ID(str, id)\
if (CSTR_EQUAL == CompareStringW(lcid, NORM_IGNORECASE, rgszNames[i], -1, L##str, -1))\
{ rgdispid[i] = id; continue; }
HRESULT TempFileCOM::GetIDsOfNames(REFIID riid, OLECHAR FAR* FAR* rgszNames, unsigned int cNames, LCID lcid, DISPID FAR* rgdispid)
{
bool unknowns = false;
for (unsigned int i = 0;i != cNames;i++)
{
CHECK_ID("WriteString", DISP_TEMPFILE_WRITE_STRING);
CHECK_ID("Close", DISP_TEMPFILE_CLOSE);
CHECK_ID("GetFilename", DISP_TEMPFILE_GET_FILENAME);
CHECK_ID("Delete", DISP_TEMPFILE_DELETE);
rgdispid[i] = DISPID_UNKNOWN;
unknowns = true;
}
if (unknowns)
return DISP_E_UNKNOWNNAME;
else
return S_OK;
}
HRESULT TempFileCOM::GetTypeInfo(unsigned int itinfo, LCID lcid, ITypeInfo FAR* FAR* pptinfo)
{
return E_NOTIMPL;
}
HRESULT TempFileCOM::GetTypeInfoCount(unsigned int FAR * pctinfo)
{
return E_NOTIMPL;
}
HRESULT TempFileCOM::Invoke(DISPID dispid, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS FAR *pdispparams, VARIANT FAR *pvarResult, EXCEPINFO FAR * pexecinfo, unsigned int FAR *puArgErr)
{
switch (dispid)
{
case DISP_TEMPFILE_WRITE_STRING:
{
const wchar_t *str = pdispparams->rgvarg[0].bstrVal;
DWORD written=0;
WriteFile(hFile, str, (DWORD)wcslen(str)*sizeof(wchar_t), &written, NULL);
return S_OK;
}
case DISP_TEMPFILE_CLOSE:
CloseHandle(hFile);
hFile=INVALID_HANDLE_VALUE;
return S_OK;
case DISP_TEMPFILE_GET_FILENAME:
{
BSTR tag = SysAllocString(filename);
VariantInit(pvarResult);
V_VT(pvarResult) = VT_BSTR;
V_BSTR(pvarResult) = tag;
return S_OK;
}
case DISP_TEMPFILE_DELETE:
DeleteFileW(filename);
return S_OK;
}
return DISP_E_MEMBERNOTFOUND;
}
STDMETHODIMP TempFileCOM::QueryInterface(REFIID riid, PVOID *ppvObject)
{
if (!ppvObject)
return E_POINTER;
else if (IsEqualIID(riid, IID_IDispatch))
*ppvObject = (IDispatch *)this;
else if (IsEqualIID(riid, IID_IUnknown))
*ppvObject = this;
else
{
*ppvObject = NULL;
return E_NOINTERFACE;
}
AddRef();
return S_OK;
}
ULONG TempFileCOM::AddRef(void)
{
return (ULONG)++ref;
}
ULONG TempFileCOM::Release(void)
{
if (--ref == 0)
delete this;
return (ULONG)ref;
}