sdk紧急求教,怎样使用dll中已经定义的函数!!
主函数过程
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
TCHAR szBuffer [40] ;
HMODULE hLibrary ;
DLLAPI pDllDrawText;
switch (message)
{
case WM_CREATE:
hLibrary = LoadLibrary(TEXT("homework4.dll"));
pDllDrawText = GetProcAddress(hLibrary,TEXT("DllDrawText"));
case WM_PAINT: //处理WM_PAINT消息,
hdc = BeginPaint (hwnd, &ps) ;//获得设备描述表句柄
GetClientRect (hwnd, &rect) ;//获得用户区域大小
TextOut(hdc,0,0,szBuffer,wsprintf(szBuffer, TEXT("这句话由主程序显示")));//主程序(exe)显示部分
pDllDrawText(hdc, &rect,TEXT ("这句话由Dll显示"));//dll显示部分
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY: //自杀
FreeLibrary(hLibrary);
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
出错提示
(71) : error C2197:'int (__stdcall *)(void)' : too many actual parameters
Error executing cl.exe.
71行就是 pDllDrawText(hdc, &rect,TEXT ("这句话由Dll显示"));//dll显示部分
函数原型
EXPORT BOOL CALLBACK DllDrawTextA (HDC hdc, PRECT prc, PCSTR pString)
{
int iLength ;
SIZE size ;
iLength=lstrlenA(pString);
GetTextExtentPoint32A(hdc,pString,iLength,&size);
return TextOutA (hdc, (prc->right - size.cx ), (prc->bottom - size.cy), pString, iLength) ;
}
并没有多余参数啊,就是三个啊!
另,我用在同一workspace 使用
「Project」菜单中,选择「Dependencies」,在「Select Project To Modify」清单方块中选择「EDRTEST」。在「Dependent On The Following Project(s)」
编译成功