很简的问题:请教,为什么会出错?

Question

报错:Unhandled exception in Tester.exe: 0xC0000005: Access Violation.源码:
_Application *pWordApp = NULL;
Documents *pWordDocs = NULL;
_Document *pWordDoc = NULL;
Selection *pWordSel = NULL;
Range *pWordRange = NULL; HRESULT hr = ::CoInitialize(NULL);
if(SUCCEEDED(hr))
{
CLSID clsid;
CLSIDFromProgID(L"Word.Application", &clsid); hr = ::CoCreateInstance(clsid,
NULL,
CLSCTX_SERVER,
__uuidof(_Application),
(LPVOID*)&pWordApp); if(SUCCEEDED(hr))
{
COleVariant vOpt1(DISP_E_PARAMNOTFOUND, VT_ERROR),
vOpt2(DISP_E_PARAMNOTFOUND, VT_ERROR),
vOpt3(DISP_E_PARAMNOTFOUND, VT_ERROR),
vOpt4(DISP_E_PARAMNOTFOUND, VT_ERROR);
pWordDocs = pWordApp->GetDocuments();
pWordDoc = pWordDocs->Add();//<-----这句时出错
pWordSel = pWordApp->GetSelection(); pWordSel->MoveStart();
pWordSel->InsertAfter("Test Word Automation");

COleVariant varFN("E:\\ttt.doc");
pWordDoc->SaveAs(&varFN); pWordApp->Release();
pWordDocs->Release();
pWordDoc->Release();
pWordSel->Release();
// pWordRange->Release();
}

::CoUninitialize();
}

Answer 1

乱了,重贴报错:Unhandled exception in Tester.exe: 0xC0000005: Access Violation.源码:
_Application *pWordApp = NULL;
Documents *pWordDocs = NULL;
_Document *pWordDoc = NULL;
Selection *pWordSel = NULL;
Range *pWordRange = NULL; HRESULT hr = ::CoInitialize(NULL);
if(SUCCEEDED(hr))
{
CLSID clsid;
CLSIDFromProgID(L"Word.Application", &clsid); hr = ::CoCreateInstance(clsid,
NULL,
CLSCTX_SERVER,
__uuidof(_Application),
(LPVOID*)&pWordApp); if(SUCCEEDED(hr))
{
COleVariant vOpt1(DISP_E_PARAMNOTFOUND, VT_ERROR),
vOpt2(DISP_E_PARAMNOTFOUND, VT_ERROR),
vOpt3(DISP_E_PARAMNOTFOUND, VT_ERROR),
vOpt4(DISP_E_PARAMNOTFOUND, VT_ERROR);
pWordDocs = pWordApp->GetDocuments();
pWordDoc = pWordDocs->Add();//<-----这句时出错
pWordSel = pWordApp->GetSelection(); pWordSel->MoveStart();
pWordSel->InsertAfter("Test Word Automation");

COleVariant varFN("E:\\ttt.doc");
pWordDoc->SaveAs(&varFN); pWordApp->Release();
pWordDocs->Release();
pWordDoc->Release();
pWordSel->Release();
// pWordRange->Release();
}

::CoUninitialize();
}

Answer 2

跟踪一下，是不是最后一句：::CoUninitialize();出错？

Answer 3

::CoUninitialize();好像不需要明确卸载的,应用程序,会自己处理的,而且com是用的引用技术的方式，所以不用担心这个问题

Answer 4

pWordDoc = pWordDocs->Add();//<-----这句时出错我都标明了,是这句出错嘛,真是的

Answer 5

你这个pWordDocs指针有问题，看看是否是有效的指针

Answer 6

pWordDocs 是否为null,跟踪调试一下就知道出错的原因了

Answer 7

跟踪过pWordApp和pWordDocs都不为null,也不是0xcccccccc,都是可用的

Answer 8

pWordDocs = pWordApp->GetDocuments();
的返回值 是空的，或许是 GetDocuments（）根本就是返回NULL？

Answer 9

GetDocuments()没有返回NULL
pWordDocs不是NULL
但是其IDispatch的[0]--[2]都是错误的
不知道为什么会这样