很久沒寫代碼，一天幾行的代碼:

typedef? int ( *PFUN)(HWND hWnd, LPCTSTR lpText, LPCTSTR lpCaption, UINT uType);
void CTestProcessMonitorDlg::OnBnClickedButton1()
{
?? ?// TODO: Add your control notification handler code here

?? ?//MessageBox(TEXT("Hello"), TEXT("Test"));

?? ?//typedef void (*pfv) ();

?? ?HMODULE hmod = ::LoadLibraryExW(TEXT("user32.dll"), NULL, 0);
?? ?if (hmod != NULL)
?? ?{
?? ??? ?PFUN pFun= (PFUN)GetProcAddress(hmod, "MessageBoxW");
?? ??? ?if (pFun != NULL)
?? ??? ?{
?? ??? ??? ?pFun(m_hWnd, TEXT("Hello"), TEXT("Test"), MB_YESNO);
?? ??? ?}

?????? :FreeLibrary(hmod);
?? ?}

??
?? ??? ??? ??? ??
}

突然出現以下的錯誤：

Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call.? This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

代碼改為如下， 則問題沒有了

typedef? int (WINAPI *PFUN)(HWND hWnd, LPCTSTR lpText, LPCTSTR lpCaption, UINT uType);
void CTestProcessMonitorDlg::OnBnClickedButton1()
{
?? ?// TODO: Add your control notification handler code here

?? ?//MessageBox(TEXT("Hello"), TEXT("Test"));

?? ?//typedef void (*pfv) ();

?? ?HMODULE hmod = ::LoadLibraryExW(TEXT("user32.dll"), NULL, 0);
?? ?if (hmod != NULL)
?? ?{
?? ??? ?PFUN pFun= (PFUN)GetProcAddress(hmod, "MessageBoxW");
?? ??? ?if (pFun != NULL)
?? ??? ?{
?? ??? ??? ?pFun(m_hWnd, TEXT("Hello"), TEXT("Test"), MB_YESNO);
?? ??? ?}

?????? ? ::FreeLibrary(hmod);
?? ?}
?? ??? ??? ??? ??? ? ?
}

// 調用約定出現問題，以前這樣調用api也沒有用上WINAPI ， 現在突然就需要了，很是迷惑？？？ 盼知情者指點！

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