If the OFN_ALLOWMULTISELECT flag is set and the user selects multiple files, the buffer contains the current directory followed by the file names of the selected files. For Explorer-style dialog boxes, the directory and file name strings are NULL separated, with an extra NULL character after the last file name. For old-style dialog boxes, the st…

WinCore.cpp

std::vector<String> Win32Core::openFilePicker(std::vector<CoreFileExtension> extensions, bool allowMultiple) {
	OPENFILENAME ofn;
	wchar_t fBuffer[2048];

	wchar_t filterString[2048];

	ZeroMemory(&ofn, sizeof(OPENFILENAME));

	ofn.lStructSize = sizeof ( ofn );
	ofn.hwndOwner = hWnd ;
	ofn.lpstrFile = fBuffer;
	ofn.lpstrFile[0] = '\0';
	ofn.nMaxFile = sizeof( fBuffer );

	if(extensions.size() > 0) {
		int offset = 0;
		for(int i =0; i < extensions.size(); i++) {
		//	filterString += extensions[i].description+"\0*."+extensions[i].extension+"\0";
			memcpy(filterString+offset, extensions[i].description.getWDataWithEncoding(String::ENCODING_UTF8), extensions[i].description.length() * sizeof(wchar_t));
			offset += extensions[i].description.length();
			filterString[offset] = '\0';
			offset++;
			filterString[offset] = '*';
			offset++;
			filterString[offset] = '.';
			offset++;
			memcpy(filterString+offset, extensions[i].extension.getWDataWithEncoding(String::ENCODING_UTF8), extensions[i].extension.length() * sizeof(wchar_t));
			offset += extensions[i].extension.length();
			filterString[offset] = '\0';
			offset++;
		}
		filterString[offset] = '\0';
		ofn.lpstrFilter = filterString;

		ofn.nFilterIndex = 1;
	} else {
		ofn.lpstrFilter = NULL;
	}

	ofn.lpstrFileTitle = NULL;
	ofn.nMaxFileTitle = 0;
	ofn.lpstrInitialDir=NULL;

	if(!allowMultiple) {
		ofn.Flags = OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST|OFN_EXPLORER;
	} else {
		ofn.Flags = OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST|OFN_ALLOWMULTISELECT|OFN_EXPLORER;
	}

	std::vector<String> retVec;

	if(GetOpenFileName(&ofn)) {
		if(allowMultiple) {
			//hier wird die Sache spannend..
			String dir = fBuffer;
			size_t pos = dir.length(), last = 0;
			while (true){
				if (fBuffer[pos + 1] == NULL){
					if (retVec.size() == 0){
						retVec.push_back(dir);
					}
					break;
				} else {
					String fileName;
					for (last = pos + 1; fBuffer[pos + 1] != NULL; pos++){
						fileName.append(fBuffer[pos + 1]);
					}
					retVec.push_back(dir + "/" + fileName);
					pos++;
				}
			}
		} else {
			retVec.push_back(String(fBuffer));
		}
	}

	SetCurrentDirectory(defaultWorkingDirectory.getWDataWithEncoding(String::ENCODING_UTF8));


	for(int i=0; i < retVec.size(); i++) {
		retVec[i] = retVec[i].replace("\\", "/");
	}
	return retVec;
}