63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
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// 18 august 2014
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#include "winapi_windows.h"
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#include "_cgo_export.h"
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// this should be reasonable
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#define NFILENAME 4096
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struct openFileData {
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HWND parent;
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void *f;
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WCHAR *filenameBuffer;
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};
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static DWORD WINAPI doOpenFile(LPVOID data)
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{
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struct openFileData *o = (struct openFileData *) data;
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OPENFILENAMEW ofn;
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DWORD err;
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o->filenameBuffer[0] = L'\0'; // required by GetOpenFileName() to indicate no previous filename
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ZeroMemory(&ofn, sizeof (OPENFILENAMEW));
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ofn.lStructSize = sizeof (OPENFILENAMEW);
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ofn.hwndOwner = o->parent;
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ofn.hInstance = hInstance;
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ofn.lpstrFilter = NULL; // no filters
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ofn.lpstrFile = o->filenameBuffer;
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ofn.nMaxFile = NFILENAME + 1; // seems to include null terminator according to docs
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ofn.lpstrInitialDir = NULL; // let system decide
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ofn.lpstrTitle = NULL; // let system decide
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// TODO OFN_SHAREAWARE?
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ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_FORCESHOWHIDDEN | OFN_HIDEREADONLY | OFN_LONGNAMES | OFN_NOCHANGEDIR | OFN_NODEREFERENCELINKS | OFN_NOTESTFILECREATE | OFN_PATHMUSTEXIST;
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if (GetOpenFileNameW(&ofn) == FALSE) {
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err = CommDlgExtendedError();
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if (err != 0) // user cancelled
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xpaniccomdlg("error running open file dialog", err);
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free(o->filenameBuffer); // free now so we can set it to NULL without leaking
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o->filenameBuffer = NULL;
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}
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if (PostMessageW(msgwin, msgOpenFileDone, (WPARAM) (o->filenameBuffer), (LPARAM) (o->f)) == 0)
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xpanic("error posting OpenFile() finished message to message-only window", GetLastError());
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free(o); // won't free o->f or o->filenameBuffer in above invocation
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return 0;
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}
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void openFile(HWND hwnd, void *f)
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{
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struct openFileData *o;
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// freed by the thread
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o = (struct openFileData *) malloc(sizeof (struct openFileData));
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if (o == NULL)
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xpanic("memory exhausted allocating data structure in OpenFile()", GetLastError());
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o->parent = hwnd;
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o->f = f;
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// freed on the Go side
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o->filenameBuffer = (WCHAR *) malloc((NFILENAME + 1) * sizeof (WCHAR));
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if (o->filenameBuffer == NULL)
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xpanic("memory exhausted allocating filename buffer in OpenFile()", GetLastError());
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if (CreateThread(NULL, 0, doOpenFile, (LPVOID) o, 0, NULL) == NULL)
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xpanic("error creating thread for running OpenFIle()", GetLastError());
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}
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