Get the version of the Common Control library on this machine. Copied from the Microsoft SDK */
| 306 | Copied from the Microsoft SDK |
| 307 | */ |
| 308 | HRESULT |
| 309 | GetComCtlVersion(LPDWORD pdwMajor, LPDWORD pdwMinor) |
| 310 | { |
| 311 | HINSTANCE hComCtl; |
| 312 | HRESULT hr = S_OK; |
| 313 | DLLGETVERSIONPROC pDllGetVersion; |
| 314 | |
| 315 | if (IsBadWritePtr(pdwMajor, sizeof(DWORD)) |
| 316 | || IsBadWritePtr(pdwMinor, sizeof(DWORD))) |
| 317 | return E_INVALIDARG; |
| 318 | // load the DLL |
| 319 | hComCtl = LoadLibrary(TEXT("comctl32.dll")); |
| 320 | if (!hComCtl) |
| 321 | return E_FAIL; |
| 322 | |
| 323 | /* |
| 324 | You must get this function explicitly because earlier versions of the DLL |
| 325 | don't implement this function. That makes the lack of implementation of |
| 326 | the |
| 327 | function a version marker in itself. |
| 328 | */ |
| 329 | pDllGetVersion = |
| 330 | (DLLGETVERSIONPROC) GetProcAddress(hComCtl, TEXT("DllGetVersion")); |
| 331 | if (pDllGetVersion) { |
| 332 | DLLVERSIONINFO dvi; |
| 333 | ZeroMemory(&dvi, sizeof(dvi)); |
| 334 | dvi.cbSize = sizeof(dvi); |
| 335 | hr = (*pDllGetVersion)(&dvi); |
| 336 | if (SUCCEEDED(hr)) { |
| 337 | *pdwMajor = dvi.dwMajorVersion; |
| 338 | *pdwMinor = dvi.dwMinorVersion; |
| 339 | } else { |
| 340 | hr = E_FAIL; |
| 341 | } |
| 342 | } else { |
| 343 | /* |
| 344 | If GetProcAddress failed, then the DLL is a version previous to the |
| 345 | one |
| 346 | shipped with IE 3.x. |
| 347 | */ |
| 348 | *pdwMajor = 4; |
| 349 | *pdwMinor = 0; |
| 350 | } |
| 351 | FreeLibrary(hComCtl); |
| 352 | return hr; |
| 353 | } |
| 354 | |
| 355 | /* apply bitmap pointed by sourceDc transparently over |
| 356 | bitmap pointed by hDC */ |